X-Git-Url: https://git.efficios.com/?a=blobdiff_plain;f=src%2Fcpp-common%2Fbt2%2Ffield-class.hpp;h=411cf6690a1798355b2bcc2341a5621f203acc01;hb=2a24eba8b45ab4bd62dfb2cd95f31e4c2a7a91a8;hp=4dbdee6057120b05d40d90d9b349799f7186ff6c;hpb=5d6ccdaeae400938ca68012cea84630f55687b6d;p=babeltrace.git

diff --git a/src/cpp-common/bt2/field-class.hpp b/src/cpp-common/bt2/field-class.hpp
index 4dbdee60..411cf669 100644
--- a/src/cpp-common/bt2/field-class.hpp
+++ b/src/cpp-common/bt2/field-class.hpp
@@ -7,41 +7,41 @@
 #ifndef BABELTRACE_CPP_COMMON_BT2_FIELD_CLASS_HPP
 #define BABELTRACE_CPP_COMMON_BT2_FIELD_CLASS_HPP
 
-#include <type_traits>
 #include <cstdint>
+#include <type_traits>
+
 #include <babeltrace2/babeltrace.h>
 
 #include "common/assert.h"
-#include "internal/borrowed-obj.hpp"
-#include "internal/shared-obj.hpp"
-#include "cpp-common/optional.hpp"
-#include "cpp-common/string_view.hpp"
-#include "common-iter.hpp"
-#include "lib-error.hpp"
-#include "integer-range-set.hpp"
+#include "cpp-common/bt2c/c-string-view.hpp"
+#include "cpp-common/bt2s/optional.hpp"
+
+#include "borrowed-object-iterator.hpp"
+#include "borrowed-object.hpp"
+#include "exc.hpp"
 #include "field-path.hpp"
+#include "integer-range-set.hpp"
+#include "internal/utils.hpp"
+#include "optional-borrowed-object.hpp"
+#include "shared-object.hpp"
 #include "value.hpp"
 
 namespace bt2 {
-
 namespace internal {
 
 struct FieldClassRefFuncs final
 {
-    static void get(const bt_field_class * const libObjPtr)
+    static void get(const bt_field_class * const libObjPtr) noexcept
     {
         bt_field_class_get_ref(libObjPtr);
     }
 
-    static void put(const bt_field_class * const libObjPtr)
+    static void put(const bt_field_class * const libObjPtr) noexcept
     {
         bt_field_class_put_ref(libObjPtr);
     }
 };
 
-template <typename ObjT, typename LibObjT>
-using SharedFieldClass = internal::SharedObj<ObjT, LibObjT, internal::FieldClassRefFuncs>;
-
 template <typename LibObjT>
 struct CommonFieldClassSpec;
 
@@ -67,6 +67,9 @@ struct CommonFieldClassSpec<const bt_field_class> final
 
 } /* namespace internal */
 
+template <typename ObjT, typename LibObjT>
+using SharedFieldClass = SharedObject<ObjT, LibObjT, internal::FieldClassRefFuncs>;
+
 template <typename LibObjT>
 class CommonBitArrayFieldClass;
 
@@ -159,60 +162,40 @@ enum class FieldClassType
 };
 
 template <typename LibObjT>
-class CommonFieldClass : public internal::BorrowedObj<LibObjT>
+class CommonFieldClass : public BorrowedObject<LibObjT>
 {
-    /* Allow appendMember() to call `fc.libObjPtr()` */
-    friend class CommonStructureFieldClass<bt_field_class>;
-
-    /* Allow appendOption() to call `fc.libObjPtr()` */
-    friend class CommonVariantWithoutSelectorFieldClass<bt_field_class>;
-
-    friend class CommonVariantWithIntegerSelectorFieldClass<
-        bt_field_class,
-        ConstVariantWithIntegerSelectorFieldClassOption<
-            const bt_field_class_variant_with_selector_field_integer_unsigned_option>>;
-
-    friend class CommonVariantWithIntegerSelectorFieldClass<
-        bt_field_class,
-        ConstVariantWithIntegerSelectorFieldClassOption<
-            const bt_field_class_variant_with_selector_field_integer_signed_option>>;
-
-    /* Allow *FieldClass() to call `fc.libObjPtr()` */
-    friend class CommonEventClass<bt_event_class>;
-    friend class CommonStreamClass<bt_stream_class>;
-
-    /* Allow create*FieldClass() to call `fc.libObjPtr()` */
-    friend class CommonTraceClass<bt_trace_class>;
-
 private:
-    using typename internal::BorrowedObj<LibObjT>::_ThisBorrowedObj;
+    using typename BorrowedObject<LibObjT>::_ThisBorrowedObject;
 
 protected:
-    using typename internal::BorrowedObj<LibObjT>::_LibObjPtr;
     using _ThisCommonFieldClass = CommonFieldClass<LibObjT>;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonFieldClass<LibObjT>, LibObjT>;
+    using typename BorrowedObject<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonFieldClass<LibObjT>, LibObjT>;
+    using UserAttributes = internal::DepUserAttrs<LibObjT>;
 
-    using UserAttributes =
-        typename std::conditional<std::is_const<LibObjT>::value, ConstMapValue, MapValue>::type;
-
-    explicit CommonFieldClass(const _LibObjPtr libObjPtr) noexcept : _ThisBorrowedObj {libObjPtr}
+    explicit CommonFieldClass(const LibObjPtr libObjPtr) noexcept : _ThisBorrowedObject {libObjPtr}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonFieldClass(const CommonFieldClass<OtherLibObjT>& fc) noexcept : _ThisBorrowedObj {fc}
+    CommonFieldClass(const CommonFieldClass<OtherLibObjT> fc) noexcept : _ThisBorrowedObject {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonFieldClass& operator=(const CommonFieldClass<OtherLibObjT>& fc) noexcept
+    CommonFieldClass operator=(const CommonFieldClass<OtherLibObjT> fc) noexcept
     {
-        _ThisBorrowedObj::operator=(fc);
+        _ThisBorrowedObject::operator=(fc);
         return *this;
     }
 
+    CommonFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonFieldClass<const bt_field_class> {*this};
+    }
+
     FieldClassType type() const noexcept
     {
         return static_cast<FieldClassType>(bt_field_class_get_type(this->libObjPtr()));
@@ -373,6 +356,12 @@ public:
         return this->_libTypeIs(BT_FIELD_CLASS_TYPE_VARIANT_WITH_SIGNED_INTEGER_SELECTOR_FIELD);
     }
 
+    template <typename FieldClassT>
+    FieldClassT as() const noexcept
+    {
+        return FieldClassT {this->libObjPtr()};
+    }
+
     CommonBitArrayFieldClass<LibObjT> asBitArray() const noexcept;
     CommonIntegerFieldClass<LibObjT> asInteger() const noexcept;
     CommonBaseEnumerationFieldClass<LibObjT> asEnumeration() const noexcept;
@@ -413,20 +402,15 @@ public:
     asVariantWithSignedIntegerSelector() const noexcept;
 
     template <typename LibValT>
-    void userAttributes(const CommonMapValue<LibValT>& userAttrs)
+    CommonFieldClass userAttributes(const CommonMapValue<LibValT> userAttrs) const noexcept
     {
-        static_assert(!std::is_const<LibObjT>::value, "`LibObjT` must NOT be `const`.");
+        static_assert(!std::is_const<LibObjT>::value, "Not available with `bt2::ConstFieldClass`.");
 
         bt_field_class_set_user_attributes(this->libObjPtr(), userAttrs.libObjPtr());
+        return *this;
     }
 
-    ConstMapValue userAttributes() const noexcept
-    {
-        return ConstMapValue {internal::CommonFieldClassSpec<const bt_field_class>::userAttributes(
-            this->libObjPtr())};
-    }
-
-    UserAttributes userAttributes() noexcept
+    UserAttributes userAttributes() const noexcept
     {
         return UserAttributes {
             internal::CommonFieldClassSpec<LibObjT>::userAttributes(this->libObjPtr())};
@@ -434,7 +418,7 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 
 protected:
@@ -447,36 +431,61 @@ protected:
 using FieldClass = CommonFieldClass<bt_field_class>;
 using ConstFieldClass = CommonFieldClass<const bt_field_class>;
 
+namespace internal {
+
+struct FieldClassTypeDescr
+{
+    using Const = ConstFieldClass;
+    using NonConst = FieldClass;
+};
+
+template <>
+struct TypeDescr<FieldClass> : public FieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstFieldClass> : public FieldClassTypeDescr
+{
+};
+
+} /* namespace internal */
+
 template <typename LibObjT>
 class CommonBitArrayFieldClass final : public CommonFieldClass<LibObjT>
 {
 private:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using typename CommonFieldClass<LibObjT>::_ThisCommonFieldClass;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonBitArrayFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonBitArrayFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonBitArrayFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonBitArrayFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isBitArray());
     }
 
     template <typename OtherLibObjT>
-    CommonBitArrayFieldClass(const CommonBitArrayFieldClass<OtherLibObjT>& fc) noexcept :
+    CommonBitArrayFieldClass(const CommonBitArrayFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonBitArrayFieldClass<LibObjT>&
-    operator=(const CommonBitArrayFieldClass<OtherLibObjT>& fc) noexcept
+    CommonBitArrayFieldClass<LibObjT>
+    operator=(const CommonBitArrayFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonFieldClass::operator=(fc);
         return *this;
     }
 
+    CommonBitArrayFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonBitArrayFieldClass<const bt_field_class> {*this};
+    }
+
     std::uint64_t length() const noexcept
     {
         return bt_field_class_bit_array_get_length(this->libObjPtr());
@@ -484,13 +493,33 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
 using BitArrayFieldClass = CommonBitArrayFieldClass<bt_field_class>;
 using ConstBitArrayFieldClass = CommonBitArrayFieldClass<const bt_field_class>;
 
+namespace internal {
+
+struct BitArrayFieldClassTypeDescr
+{
+    using Const = ConstBitArrayFieldClass;
+    using NonConst = BitArrayFieldClass;
+};
+
+template <>
+struct TypeDescr<BitArrayFieldClass> : public BitArrayFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstBitArrayFieldClass> : public BitArrayFieldClassTypeDescr
+{
+};
+
+} /* namespace internal */
+
 enum class DisplayBase
 {
     BINARY = BT_FIELD_CLASS_INTEGER_PREFERRED_DISPLAY_BASE_BINARY,
@@ -506,36 +535,43 @@ private:
     using typename CommonFieldClass<LibObjT>::_ThisCommonFieldClass;
 
 protected:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using _ThisCommonIntegerFieldClass = CommonIntegerFieldClass<LibObjT>;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonIntegerFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonIntegerFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonIntegerFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonIntegerFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isInteger());
     }
 
     template <typename OtherLibObjT>
-    CommonIntegerFieldClass(const CommonIntegerFieldClass<OtherLibObjT>& fc) noexcept :
+    CommonIntegerFieldClass(const CommonIntegerFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonIntegerFieldClass& operator=(const CommonIntegerFieldClass<OtherLibObjT>& fc) noexcept
+    CommonIntegerFieldClass operator=(const CommonIntegerFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonFieldClass::operator=(fc);
         return *this;
     }
 
-    void fieldValueRange(const std::uint64_t n) noexcept
+    CommonIntegerFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonIntegerFieldClass<const bt_field_class> {*this};
+    }
+
+    CommonIntegerFieldClass fieldValueRange(const std::uint64_t n) const noexcept
     {
-        static_assert(!std::is_const<LibObjT>::value, "`LibObjT` must NOT be `const`.");
+        static_assert(!std::is_const<LibObjT>::value,
+                      "Not available with `bt2::ConstIntegerFieldClass`.");
 
         bt_field_class_integer_set_field_value_range(this->libObjPtr(), n);
+        return *this;
     }
 
     std::uint64_t fieldValueRange() const noexcept
@@ -543,12 +579,14 @@ public:
         return bt_field_class_integer_get_field_value_range(this->libObjPtr());
     }
 
-    void preferredDisplayBase(const DisplayBase base) noexcept
+    CommonIntegerFieldClass preferredDisplayBase(const DisplayBase base) const noexcept
     {
-        static_assert(!std::is_const<LibObjT>::value, "`LibObjT` must NOT be `const`.");
+        static_assert(!std::is_const<LibObjT>::value,
+                      "Not available with `bt2::ConstIntegerFieldClass`.");
 
         bt_field_class_integer_set_preferred_display_base(
             this->libObjPtr(), static_cast<bt_field_class_integer_preferred_display_base>(base));
+        return *this;
     }
 
     DisplayBase preferredDisplayBase() const noexcept
@@ -559,7 +597,7 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -568,6 +606,22 @@ using ConstIntegerFieldClass = CommonIntegerFieldClass<const bt_field_class>;
 
 namespace internal {
 
+struct IntegerFieldClassTypeDescr
+{
+    using Const = ConstIntegerFieldClass;
+    using NonConst = IntegerFieldClass;
+};
+
+template <>
+struct TypeDescr<IntegerFieldClass> : public IntegerFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstIntegerFieldClass> : public IntegerFieldClassTypeDescr
+{
+};
+
 template <typename LibObjT>
 struct ConstEnumerationFieldClassMappingSpec;
 
@@ -611,31 +665,32 @@ struct ConstEnumerationFieldClassMappingSpec<const bt_field_class_enumeration_si
 } /* namespace internal */
 
 template <typename LibObjT>
-class ConstEnumerationFieldClassMapping final : public internal::BorrowedObj<LibObjT>
+class ConstEnumerationFieldClassMapping final : public BorrowedObject<LibObjT>
 {
 private:
-    using typename internal::BorrowedObj<LibObjT>::_ThisBorrowedObj;
-    using typename internal::BorrowedObj<LibObjT>::_LibObjPtr;
+    using typename BorrowedObject<LibObjT>::_ThisBorrowedObject;
 
 public:
+    using typename BorrowedObject<LibObjT>::LibObjPtr;
+
     using RangeSet = typename std::conditional<
         std::is_same<LibObjT, const bt_field_class_enumeration_unsigned_mapping>::value,
         ConstUnsignedIntegerRangeSet, ConstSignedIntegerRangeSet>::type;
 
-    explicit ConstEnumerationFieldClassMapping(const _LibObjPtr libObjPtr) noexcept :
-        _ThisBorrowedObj {libObjPtr}
+    explicit ConstEnumerationFieldClassMapping(const LibObjPtr libObjPtr) noexcept :
+        _ThisBorrowedObject {libObjPtr}
     {
     }
 
     ConstEnumerationFieldClassMapping(const ConstEnumerationFieldClassMapping& mapping) noexcept :
-        _ThisBorrowedObj {mapping}
+        _ThisBorrowedObject {mapping}
     {
     }
 
-    ConstEnumerationFieldClassMapping&
+    ConstEnumerationFieldClassMapping
     operator=(const ConstEnumerationFieldClassMapping& mapping) noexcept
     {
-        _ThisBorrowedObj::operator=(mapping);
+        _ThisBorrowedObject::operator=(mapping);
         return *this;
     }
 
@@ -645,7 +700,7 @@ public:
             internal::ConstEnumerationFieldClassMappingSpec<LibObjT>::ranges(this->libObjPtr())};
     }
 
-    bpstd::string_view label() const noexcept
+    bt2c::CStringView label() const noexcept
     {
         return internal::ConstEnumerationFieldClassMappingSpec<LibObjT>::label(this->libObjPtr());
     }
@@ -719,41 +774,46 @@ private:
     using typename CommonIntegerFieldClass<LibObjT>::_ThisCommonIntegerFieldClass;
 
 protected:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using _ThisCommonBaseEnumerationFieldClass = CommonBaseEnumerationFieldClass<LibObjT>;
 
 public:
-    using Shared = internal::SharedFieldClass<_ThisCommonBaseEnumerationFieldClass, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<_ThisCommonBaseEnumerationFieldClass, LibObjT>;
 
-    explicit CommonBaseEnumerationFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonBaseEnumerationFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonIntegerFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isEnumeration());
     }
 
     template <typename OtherLibObjT>
-    CommonBaseEnumerationFieldClass(
-        const CommonBaseEnumerationFieldClass<OtherLibObjT>& fc) noexcept :
+    CommonBaseEnumerationFieldClass(const CommonBaseEnumerationFieldClass<OtherLibObjT> fc) noexcept
+        :
         _ThisCommonIntegerFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonBaseEnumerationFieldClass&
-    operator=(const CommonBaseEnumerationFieldClass<OtherLibObjT>& fc) noexcept
+    CommonBaseEnumerationFieldClass
+    operator=(const CommonBaseEnumerationFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonIntegerFieldClass::operator=(fc);
         return *this;
     }
 
-    std::uint64_t size() const noexcept
+    CommonBaseEnumerationFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonBaseEnumerationFieldClass<const bt_field_class> {*this};
+    }
+
+    std::uint64_t length() const noexcept
     {
         return bt_field_class_enumeration_get_mapping_count(this->libObjPtr());
     }
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -761,15 +821,15 @@ template <typename LibObjT, typename MappingT>
 class CommonEnumerationFieldClass final : public CommonBaseEnumerationFieldClass<LibObjT>
 {
 private:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using typename CommonBaseEnumerationFieldClass<LibObjT>::_ThisCommonBaseEnumerationFieldClass;
-    using _ThisCommonEnumerationFieldClass = CommonEnumerationFieldClass<LibObjT, MappingT>;
 
 public:
-    using Shared = internal::SharedFieldClass<_ThisCommonEnumerationFieldClass, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonEnumerationFieldClass, LibObjT>;
+    using Iterator = BorrowedObjectIterator<CommonEnumerationFieldClass>;
     using Mapping = MappingT;
 
-    explicit CommonEnumerationFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonEnumerationFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonBaseEnumerationFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isEnumeration());
@@ -777,16 +837,16 @@ public:
 
     template <typename OtherLibObjT>
     CommonEnumerationFieldClass(
-        const CommonEnumerationFieldClass<OtherLibObjT, MappingT>& fc) noexcept :
-        _ThisCommonEnumerationFieldClass {fc}
+        const CommonEnumerationFieldClass<OtherLibObjT, MappingT> fc) noexcept :
+        CommonEnumerationFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonEnumerationFieldClass&
-    operator=(const CommonEnumerationFieldClass<OtherLibObjT, MappingT>& fc) noexcept
+    CommonEnumerationFieldClass
+    operator=(const CommonEnumerationFieldClass<OtherLibObjT, MappingT> fc) noexcept
     {
-        _ThisCommonEnumerationFieldClass::operator=(fc);
+        CommonEnumerationFieldClass::operator=(fc);
         return *this;
     }
 
@@ -796,41 +856,38 @@ public:
             this->libObjPtr(), index)};
     }
 
-    nonstd::optional<Mapping> operator[](const char * const label) const noexcept
+    OptionalBorrowedObject<Mapping> operator[](const bt2c::CStringView label) const noexcept
     {
-        const auto libObjPtr = internal::CommonEnumerationFieldClassSpec<MappingT>::mappingByLabel(
+        return internal::CommonEnumerationFieldClassSpec<MappingT>::mappingByLabel(
             this->libObjPtr(), label);
-
-        if (libObjPtr) {
-            return Mapping {libObjPtr};
-        }
-
-        return nonstd::nullopt;
     }
 
-    nonstd::optional<Mapping> operator[](const std::string& label) const noexcept
-    {
-        return (*this)[label.data()];
-    }
-
-    void addMapping(const char * const label, const typename Mapping::RangeSet ranges)
+    CommonEnumerationFieldClass addMapping(const bt2c::CStringView label,
+                                           const typename Mapping::RangeSet ranges) const
     {
         const auto status = internal::CommonEnumerationFieldClassSpec<MappingT>::addMapping(
             this->libObjPtr(), label, ranges.libObjPtr());
 
         if (status == BT_FIELD_CLASS_ENUMERATION_ADD_MAPPING_STATUS_MEMORY_ERROR) {
-            throw LibMemoryError {};
+            throw MemoryError {};
         }
+
+        return *this;
+    }
+
+    Iterator begin() const noexcept
+    {
+        return Iterator {*this, 0};
     }
 
-    void addMapping(const std::string& label, const typename Mapping::RangeSet ranges)
+    Iterator end() const noexcept
     {
-        this->addMapping(label.data(), ranges);
+        return Iterator {*this, this->length()};
     }
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -851,6 +908,38 @@ using ConstSignedEnumerationFieldClass =
 
 namespace internal {
 
+struct UnsignedEnumerationFieldClassTypeDescr
+{
+    using Const = ConstUnsignedEnumerationFieldClass;
+    using NonConst = UnsignedEnumerationFieldClass;
+};
+
+template <>
+struct TypeDescr<UnsignedEnumerationFieldClass> : public UnsignedEnumerationFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstUnsignedEnumerationFieldClass> : public UnsignedEnumerationFieldClassTypeDescr
+{
+};
+
+struct SignedEnumerationFieldClassTypeDescr
+{
+    using Const = ConstSignedEnumerationFieldClass;
+    using NonConst = SignedEnumerationFieldClass;
+};
+
+template <>
+struct TypeDescr<SignedEnumerationFieldClass> : public SignedEnumerationFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstSignedEnumerationFieldClass> : public SignedEnumerationFieldClassTypeDescr
+{
+};
+
 template <typename LibObjT>
 struct CommonStructureFieldClassMemberSpec;
 
@@ -862,6 +951,11 @@ struct CommonStructureFieldClassMemberSpec<bt_field_class_structure_member> fina
     {
         return bt_field_class_structure_member_borrow_field_class(libObjPtr);
     }
+
+    static bt_value *userAttributes(bt_field_class_structure_member * const libObjPtr) noexcept
+    {
+        return bt_field_class_structure_member_borrow_user_attributes(libObjPtr);
+    }
 };
 
 /* Functions specific to constant structure field class members */
@@ -873,57 +967,81 @@ struct CommonStructureFieldClassMemberSpec<const bt_field_class_structure_member
     {
         return bt_field_class_structure_member_borrow_field_class_const(libObjPtr);
     }
+
+    static const bt_value *
+    userAttributes(const bt_field_class_structure_member * const libObjPtr) noexcept
+    {
+        return bt_field_class_structure_member_borrow_user_attributes_const(libObjPtr);
+    }
 };
 
 } /* namespace internal */
 
 template <typename LibObjT>
-class CommonStructureFieldClassMember final : public internal::BorrowedObj<LibObjT>
+class CommonStructureFieldClassMember final : public BorrowedObject<LibObjT>
 {
 private:
-    using typename internal::BorrowedObj<LibObjT>::_LibObjPtr;
-    using typename internal::BorrowedObj<LibObjT>::_ThisBorrowedObj;
-
-    using _FieldClass =
-        typename std::conditional<std::is_const<LibObjT>::value, ConstFieldClass, FieldClass>::type;
+    using typename BorrowedObject<LibObjT>::_ThisBorrowedObject;
+    using _FieldClass = internal::DepFc<LibObjT>;
 
 public:
-    explicit CommonStructureFieldClassMember(const _LibObjPtr libObjPtr) noexcept :
-        _ThisBorrowedObj {libObjPtr}
+    using typename BorrowedObject<LibObjT>::LibObjPtr;
+    using UserAttributes = internal::DepUserAttrs<LibObjT>;
+
+    explicit CommonStructureFieldClassMember(const LibObjPtr libObjPtr) noexcept :
+        _ThisBorrowedObject {libObjPtr}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonStructureFieldClassMember(
-        const CommonStructureFieldClassMember<OtherLibObjT>& fc) noexcept :
-        _ThisBorrowedObj {fc}
+    CommonStructureFieldClassMember(const CommonStructureFieldClassMember<OtherLibObjT> fc) noexcept
+        :
+        _ThisBorrowedObject {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonStructureFieldClassMember<LibObjT>&
-    operator=(const CommonStructureFieldClassMember<OtherLibObjT>& fc) noexcept
+    CommonStructureFieldClassMember<LibObjT>
+    operator=(const CommonStructureFieldClassMember<OtherLibObjT> fc) noexcept
     {
-        _ThisBorrowedObj::operator=(fc);
+        _ThisBorrowedObject::operator=(fc);
         return *this;
     }
 
-    bpstd::string_view name() const noexcept
+    CommonStructureFieldClassMember<const bt_field_class_structure_member> asConst() const noexcept
     {
-        return bt_field_class_structure_member_get_name(this->libObjPtr());
+        return CommonStructureFieldClassMember<const bt_field_class_structure_member> {*this};
     }
 
-    ConstFieldClass fieldClass() const noexcept
+    bt2c::CStringView name() const noexcept
     {
-        return ConstFieldClass {internal::CommonStructureFieldClassMemberSpec<
-            const bt_field_class_structure_member>::fieldClass(this->libObjPtr())};
+        return bt_field_class_structure_member_get_name(this->libObjPtr());
     }
 
-    _FieldClass fieldClass() noexcept
+    _FieldClass fieldClass() const noexcept
     {
         return _FieldClass {
             internal::CommonStructureFieldClassMemberSpec<LibObjT>::fieldClass(this->libObjPtr())};
     }
+
+    template <typename LibValT>
+    CommonStructureFieldClassMember
+    userAttributes(const CommonMapValue<LibValT> userAttrs) const noexcept
+    {
+        static_assert(!std::is_const<LibObjT>::value,
+                      "Not available with `bt2::ConstStructureFieldClassMember`.");
+
+        bt_field_class_structure_member_set_user_attributes(this->libObjPtr(),
+                                                            userAttrs.libObjPtr());
+        return *this;
+    }
+
+    UserAttributes userAttributes() const noexcept
+    {
+        return UserAttributes {
+            internal::CommonStructureFieldClassMemberSpec<LibObjT>::userAttributes(
+                this->libObjPtr())};
+    }
 };
 
 using StructureFieldClassMember = CommonStructureFieldClassMember<bt_field_class_structure_member>;
@@ -933,6 +1051,22 @@ using ConstStructureFieldClassMember =
 
 namespace internal {
 
+struct StructureFieldClassMemberTypeDescr
+{
+    using Const = ConstStructureFieldClassMember;
+    using NonConst = StructureFieldClassMember;
+};
+
+template <>
+struct TypeDescr<StructureFieldClassMember> : public StructureFieldClassMemberTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstStructureFieldClassMember> : public StructureFieldClassMemberTypeDescr
+{
+};
+
 template <typename LibObjT>
 struct CommonStructureFieldClassSpec;
 
@@ -976,54 +1110,56 @@ template <typename LibObjT>
 class CommonStructureFieldClass final : public CommonFieldClass<LibObjT>
 {
 private:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using typename CommonFieldClass<LibObjT>::_ThisCommonFieldClass;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonStructureFieldClass<LibObjT>, LibObjT>;
-    using Member =
-        typename std::conditional<std::is_const<LibObjT>::value, ConstStructureFieldClassMember,
-                                  StructureFieldClassMember>::type;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonStructureFieldClass<LibObjT>, LibObjT>;
+    using Iterator = BorrowedObjectIterator<CommonStructureFieldClass<LibObjT>>;
 
-    using Iterator = CommonIterator<CommonStructureFieldClass<LibObjT>, Member>;
+    using Member =
+        internal::DepType<LibObjT, StructureFieldClassMember, ConstStructureFieldClassMember>;
 
-    explicit CommonStructureFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonStructureFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isStructure());
     }
 
     template <typename OtherLibObjT>
-    CommonStructureFieldClass(const CommonStructureFieldClass<OtherLibObjT>& fc) noexcept :
+    CommonStructureFieldClass(const CommonStructureFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonStructureFieldClass& operator=(const CommonStructureFieldClass<OtherLibObjT>& fc) noexcept
+    CommonStructureFieldClass operator=(const CommonStructureFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonFieldClass::operator=(fc);
         return *this;
     }
 
-    void appendMember(const char * const name, const FieldClass& fc)
+    CommonStructureFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonStructureFieldClass<const bt_field_class> {*this};
+    }
+
+    CommonStructureFieldClass appendMember(const bt2c::CStringView name, const FieldClass fc) const
     {
-        static_assert(!std::is_const<LibObjT>::value, "`LibObjT` must NOT be `const`.");
+        static_assert(!std::is_const<LibObjT>::value,
+                      "Not available with `bt2::ConstStructureFieldClass`.");
 
         const auto status =
             bt_field_class_structure_append_member(this->libObjPtr(), name, fc.libObjPtr());
 
         if (status == BT_FIELD_CLASS_STRUCTURE_APPEND_MEMBER_STATUS_MEMORY_ERROR) {
-            throw LibMemoryError {};
+            throw MemoryError {};
         }
-    }
 
-    void appendMember(const std::string& name, const FieldClass& fc)
-    {
-        this->appendMember(name.data(), fc);
+        return *this;
     }
 
-    std::uint64_t size() const noexcept
+    std::uint64_t length() const noexcept
     {
         return bt_field_class_structure_get_member_count(this->libObjPtr());
     }
@@ -1035,62 +1171,24 @@ public:
 
     Iterator end() const noexcept
     {
-        return Iterator {*this, this->size()};
-    }
-
-    ConstStructureFieldClassMember operator[](const std::uint64_t index) const noexcept
-    {
-        return ConstStructureFieldClassMember {
-            internal::CommonStructureFieldClassSpec<const bt_field_class>::memberByIndex(
-                this->libObjPtr(), index)};
+        return Iterator {*this, this->length()};
     }
 
-    Member operator[](const std::uint64_t index) noexcept
+    Member operator[](const std::uint64_t index) const noexcept
     {
         return Member {internal::CommonStructureFieldClassSpec<LibObjT>::memberByIndex(
             this->libObjPtr(), index)};
     }
 
-    nonstd::optional<ConstStructureFieldClassMember>
-    operator[](const char * const name) const noexcept
-    {
-        const auto libObjPtr =
-            internal::CommonStructureFieldClassSpec<const bt_field_class>::memberByName(
-                this->libObjPtr(), name);
-
-        if (libObjPtr) {
-            return ConstStructureFieldClassMember {libObjPtr};
-        }
-
-        return nonstd::nullopt;
-    }
-
-    nonstd::optional<ConstStructureFieldClassMember>
-    operator[](const std::string& name) const noexcept
-    {
-        return (*this)[name.data()];
-    }
-
-    nonstd::optional<Member> operator[](const char * const name) noexcept
-    {
-        const auto libObjPtr =
-            internal::CommonStructureFieldClassSpec<LibObjT>::memberByName(this->libObjPtr(), name);
-
-        if (libObjPtr) {
-            return Member {libObjPtr};
-        }
-
-        return nonstd::nullopt;
-    }
-
-    nonstd::optional<Member> operator[](const std::string& name) noexcept
+    OptionalBorrowedObject<Member> operator[](const bt2c::CStringView name) const noexcept
     {
-        return (*this)[name.data()];
+        return internal::CommonStructureFieldClassSpec<LibObjT>::memberByName(this->libObjPtr(),
+                                                                              name);
     }
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -1099,6 +1197,22 @@ using ConstStructureFieldClass = CommonStructureFieldClass<const bt_field_class>
 
 namespace internal {
 
+struct StructureFieldClassTypeDescr
+{
+    using Const = ConstStructureFieldClass;
+    using NonConst = StructureFieldClass;
+};
+
+template <>
+struct TypeDescr<StructureFieldClass> : public StructureFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstStructureFieldClass> : public StructureFieldClassTypeDescr
+{
+};
+
 template <typename LibObjT>
 struct CommonArrayFieldClassSpec;
 
@@ -1129,44 +1243,40 @@ class CommonArrayFieldClass : public CommonFieldClass<LibObjT>
 {
 private:
     using typename CommonFieldClass<LibObjT>::_ThisCommonFieldClass;
-
-    using _FieldClass =
-        typename std::conditional<std::is_const<LibObjT>::value, ConstFieldClass, FieldClass>::type;
+    using _FieldClass = internal::DepFc<LibObjT>;
 
 protected:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using _ThisCommonArrayFieldClass = CommonArrayFieldClass<LibObjT>;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonArrayFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonArrayFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonArrayFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonArrayFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isArray());
     }
 
     template <typename OtherLibObjT>
-    CommonArrayFieldClass(const CommonArrayFieldClass<OtherLibObjT>& fc) noexcept :
+    CommonArrayFieldClass(const CommonArrayFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonArrayFieldClass& operator=(const CommonArrayFieldClass<OtherLibObjT>& fc) noexcept
+    CommonArrayFieldClass operator=(const CommonArrayFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonFieldClass::operator=(fc);
         return *this;
     }
 
-    ConstFieldClass elementFieldClass() const noexcept
+    CommonArrayFieldClass<const bt_field_class> asConst() const noexcept
     {
-        return ConstFieldClass {
-            internal::CommonArrayFieldClassSpec<const bt_field_class>::elementFieldClass(
-                this->libObjPtr())};
+        return CommonArrayFieldClass<const bt_field_class> {*this};
     }
 
-    _FieldClass elementFieldClass() noexcept
+    _FieldClass elementFieldClass() const noexcept
     {
         return _FieldClass {
             internal::CommonArrayFieldClassSpec<LibObjT>::elementFieldClass(this->libObjPtr())};
@@ -1174,43 +1284,68 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
 using ArrayFieldClass = CommonArrayFieldClass<bt_field_class>;
 using ConstArrayFieldClass = CommonArrayFieldClass<const bt_field_class>;
 
+namespace internal {
+
+struct ArrayFieldClassTypeDescr
+{
+    using Const = ConstArrayFieldClass;
+    using NonConst = ArrayFieldClass;
+};
+
+template <>
+struct TypeDescr<ArrayFieldClass> : public ArrayFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstArrayFieldClass> : public ArrayFieldClassTypeDescr
+{
+};
+
+} /* namespace internal */
+
 template <typename LibObjT>
 class CommonStaticArrayFieldClass final : public CommonArrayFieldClass<LibObjT>
 {
 private:
     using typename CommonArrayFieldClass<LibObjT>::_ThisCommonArrayFieldClass;
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonStaticArrayFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonStaticArrayFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonStaticArrayFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonStaticArrayFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonArrayFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isStaticArray());
     }
 
     template <typename OtherLibObjT>
-    CommonStaticArrayFieldClass(const CommonStaticArrayFieldClass<OtherLibObjT>& fc) noexcept :
+    CommonStaticArrayFieldClass(const CommonStaticArrayFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonArrayFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonStaticArrayFieldClass&
-    operator=(const CommonStaticArrayFieldClass<OtherLibObjT>& fc) noexcept
+    CommonStaticArrayFieldClass
+    operator=(const CommonStaticArrayFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonArrayFieldClass::operator=(fc);
         return *this;
     }
 
+    CommonStaticArrayFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonStaticArrayFieldClass<const bt_field_class> {*this};
+    }
+
     std::uint64_t length() const noexcept
     {
         return bt_field_class_array_static_get_length(this->libObjPtr());
@@ -1218,25 +1353,44 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
 using StaticArrayFieldClass = CommonStaticArrayFieldClass<bt_field_class>;
 using ConstStaticArrayFieldClass = CommonStaticArrayFieldClass<const bt_field_class>;
 
+namespace internal {
+
+struct StaticArrayFieldClassTypeDescr
+{
+    using Const = ConstStaticArrayFieldClass;
+    using NonConst = StaticArrayFieldClass;
+};
+
+template <>
+struct TypeDescr<StaticArrayFieldClass> : public StaticArrayFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstStaticArrayFieldClass> : public StaticArrayFieldClassTypeDescr
+{
+};
+
+} /* namespace internal */
+
 template <typename LibObjT>
 class CommonDynamicArrayWithLengthFieldClass final : public CommonArrayFieldClass<LibObjT>
 {
 private:
     using typename CommonArrayFieldClass<LibObjT>::_ThisCommonArrayFieldClass;
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
 
 public:
-    using Shared =
-        internal::SharedFieldClass<CommonDynamicArrayWithLengthFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonDynamicArrayWithLengthFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonDynamicArrayWithLengthFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonDynamicArrayWithLengthFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonArrayFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isDynamicArrayWithLength());
@@ -1244,19 +1398,24 @@ public:
 
     template <typename OtherLibObjT>
     CommonDynamicArrayWithLengthFieldClass(
-        const CommonDynamicArrayWithLengthFieldClass<OtherLibObjT>& fc) noexcept :
+        const CommonDynamicArrayWithLengthFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonArrayFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonDynamicArrayWithLengthFieldClass&
-    operator=(const CommonDynamicArrayWithLengthFieldClass<OtherLibObjT>& fc) noexcept
+    CommonDynamicArrayWithLengthFieldClass
+    operator=(const CommonDynamicArrayWithLengthFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonArrayFieldClass::operator=(fc);
         return *this;
     }
 
+    CommonDynamicArrayWithLengthFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonDynamicArrayWithLengthFieldClass<const bt_field_class> {*this};
+    }
+
     ConstFieldPath lengthFieldPath() const noexcept
     {
         return ConstFieldPath {
@@ -1266,7 +1425,7 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -1277,6 +1436,24 @@ using ConstDynamicArrayWithLengthFieldClass =
 
 namespace internal {
 
+struct DynamicArrayWithLengthFieldClassTypeDescr
+{
+    using Const = ConstDynamicArrayWithLengthFieldClass;
+    using NonConst = DynamicArrayWithLengthFieldClass;
+};
+
+template <>
+struct TypeDescr<DynamicArrayWithLengthFieldClass> :
+    public DynamicArrayWithLengthFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstDynamicArrayWithLengthFieldClass> :
+    public DynamicArrayWithLengthFieldClassTypeDescr
+{
+};
+
 template <typename LibObjT>
 struct CommonOptionFieldClassSpec;
 
@@ -1307,44 +1484,40 @@ class CommonOptionFieldClass : public CommonFieldClass<LibObjT>
 {
 private:
     using typename CommonFieldClass<LibObjT>::_ThisCommonFieldClass;
-
-    using _FieldClass =
-        typename std::conditional<std::is_const<LibObjT>::value, ConstFieldClass, FieldClass>::type;
+    using _FieldClass = internal::DepFc<LibObjT>;
 
 protected:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using _ThisCommonOptionFieldClass = CommonOptionFieldClass<LibObjT>;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonOptionFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonOptionFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonOptionFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonOptionFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isOption());
     }
 
     template <typename OtherLibObjT>
-    CommonOptionFieldClass(const CommonOptionFieldClass<OtherLibObjT>& fc) noexcept :
+    CommonOptionFieldClass(const CommonOptionFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonOptionFieldClass& operator=(const CommonOptionFieldClass<OtherLibObjT>& fc) noexcept
+    CommonOptionFieldClass operator=(const CommonOptionFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonFieldClass::operator=(fc);
         return *this;
     }
 
-    ConstFieldClass fieldClass() const noexcept
+    CommonOptionFieldClass<const bt_field_class> asConst() const noexcept
     {
-        return ConstFieldClass {
-            internal::CommonOptionFieldClassSpec<const bt_field_class>::fieldClass(
-                this->libObjPtr())};
+        return CommonOptionFieldClass<const bt_field_class> {*this};
     }
 
-    _FieldClass fieldClass() noexcept
+    _FieldClass fieldClass() const noexcept
     {
         return _FieldClass {
             internal::CommonOptionFieldClassSpec<LibObjT>::fieldClass(this->libObjPtr())};
@@ -1352,13 +1525,33 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
 using OptionFieldClass = CommonOptionFieldClass<bt_field_class>;
 using ConstOptionFieldClass = CommonOptionFieldClass<const bt_field_class>;
 
+namespace internal {
+
+struct OptionFieldClassTypeDescr
+{
+    using Const = ConstOptionFieldClass;
+    using NonConst = OptionFieldClass;
+};
+
+template <>
+struct TypeDescr<OptionFieldClass> : public OptionFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstOptionFieldClass> : public OptionFieldClassTypeDescr
+{
+};
+
+} /* namespace internal */
+
 template <typename LibObjT>
 class CommonOptionWithSelectorFieldClass : public CommonOptionFieldClass<LibObjT>
 {
@@ -1366,13 +1559,13 @@ private:
     using typename CommonOptionFieldClass<LibObjT>::_ThisCommonOptionFieldClass;
 
 protected:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using _ThisCommonOptionWithSelectorFieldClass = CommonOptionWithSelectorFieldClass<LibObjT>;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonOptionWithSelectorFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonOptionWithSelectorFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonOptionWithSelectorFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonOptionWithSelectorFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonOptionFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isOptionWithSelector());
@@ -1380,19 +1573,24 @@ public:
 
     template <typename OtherLibObjT>
     CommonOptionWithSelectorFieldClass(
-        const CommonOptionWithSelectorFieldClass<OtherLibObjT>& fc) noexcept :
+        const CommonOptionWithSelectorFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonOptionFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonOptionWithSelectorFieldClass&
-    operator=(const CommonOptionWithSelectorFieldClass<OtherLibObjT>& fc) noexcept
+    CommonOptionWithSelectorFieldClass
+    operator=(const CommonOptionWithSelectorFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonOptionFieldClass::operator=(fc);
         return *this;
     }
 
+    CommonOptionWithSelectorFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonOptionWithSelectorFieldClass<const bt_field_class> {*this};
+    }
+
     ConstFieldPath selectorFieldPath() const noexcept
     {
         return ConstFieldPath {
@@ -1402,27 +1600,45 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
 using OptionWithSelectorFieldClass = CommonOptionWithSelectorFieldClass<bt_field_class>;
 using ConstOptionWithSelectorFieldClass = CommonOptionWithSelectorFieldClass<const bt_field_class>;
 
+namespace internal {
+
+struct OptionWithSelectorFieldClassTypeDescr
+{
+    using Const = ConstOptionWithSelectorFieldClass;
+    using NonConst = OptionWithSelectorFieldClass;
+};
+
+template <>
+struct TypeDescr<OptionWithSelectorFieldClass> : public OptionWithSelectorFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstOptionWithSelectorFieldClass> : public OptionWithSelectorFieldClassTypeDescr
+{
+};
+
+} /* namespace internal */
+
 template <typename LibObjT>
 class CommonOptionWithBoolSelectorFieldClass : public CommonOptionWithSelectorFieldClass<LibObjT>
 {
 private:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
-
     using typename CommonOptionWithSelectorFieldClass<
         LibObjT>::_ThisCommonOptionWithSelectorFieldClass;
 
 public:
-    using Shared =
-        internal::SharedFieldClass<CommonOptionWithBoolSelectorFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonOptionWithBoolSelectorFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonOptionWithBoolSelectorFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonOptionWithBoolSelectorFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonOptionWithSelectorFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isOptionWithBoolSelector());
@@ -1430,19 +1646,24 @@ public:
 
     template <typename OtherLibObjT>
     CommonOptionWithBoolSelectorFieldClass(
-        const CommonOptionWithBoolSelectorFieldClass<OtherLibObjT>& fc) noexcept :
+        const CommonOptionWithBoolSelectorFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonOptionWithSelectorFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonOptionWithBoolSelectorFieldClass&
-    operator=(const CommonOptionWithBoolSelectorFieldClass<OtherLibObjT>& fc) noexcept
+    CommonOptionWithBoolSelectorFieldClass
+    operator=(const CommonOptionWithBoolSelectorFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonOptionWithSelectorFieldClass::operator=(fc);
         return *this;
     }
 
+    CommonOptionWithBoolSelectorFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonOptionWithBoolSelectorFieldClass<const bt_field_class> {*this};
+    }
+
     bool selectorIsReversed() const noexcept
     {
         return bt_field_class_option_with_selector_field_bool_selector_is_reversed(
@@ -1451,7 +1672,7 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -1462,6 +1683,24 @@ using ConstOptionWithBoolSelectorFieldClass =
 
 namespace internal {
 
+struct OptionWithBoolSelectorFieldClassTypeDescr
+{
+    using Const = ConstOptionWithBoolSelectorFieldClass;
+    using NonConst = OptionWithBoolSelectorFieldClass;
+};
+
+template <>
+struct TypeDescr<OptionWithBoolSelectorFieldClass> :
+    public OptionWithBoolSelectorFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstOptionWithBoolSelectorFieldClass> :
+    public OptionWithBoolSelectorFieldClassTypeDescr
+{
+};
+
 template <typename RangeSetT>
 struct CommonOptionWithIntegerSelectorFieldClassSpec;
 
@@ -1495,21 +1734,15 @@ template <typename LibObjT, typename RangeSetT>
 class CommonOptionWithIntegerSelectorFieldClass : public CommonOptionWithSelectorFieldClass<LibObjT>
 {
 private:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
-
     using typename CommonOptionWithSelectorFieldClass<
         LibObjT>::_ThisCommonOptionWithSelectorFieldClass;
 
-    using _ThisCommonOptionWithIntegerSelectorFieldClass =
-        CommonOptionWithIntegerSelectorFieldClass<LibObjT, RangeSetT>;
-
 public:
-    using Shared =
-        internal::SharedFieldClass<_ThisCommonOptionWithIntegerSelectorFieldClass, LibObjT>;
-
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonOptionWithIntegerSelectorFieldClass, LibObjT>;
     using RangeSet = RangeSetT;
 
-    explicit CommonOptionWithIntegerSelectorFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonOptionWithIntegerSelectorFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonOptionWithSelectorFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isOptionWithIntegerSelector());
@@ -1517,14 +1750,14 @@ public:
 
     template <typename OtherLibObjT>
     CommonOptionWithIntegerSelectorFieldClass(
-        const CommonOptionWithIntegerSelectorFieldClass<OtherLibObjT, RangeSetT>& fc) noexcept :
+        const CommonOptionWithIntegerSelectorFieldClass<OtherLibObjT, RangeSetT> fc) noexcept :
         _ThisCommonOptionWithSelectorFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonOptionWithIntegerSelectorFieldClass&
-    operator=(const CommonOptionWithIntegerSelectorFieldClass<OtherLibObjT, RangeSetT>& fc) noexcept
+    CommonOptionWithIntegerSelectorFieldClass
+    operator=(const CommonOptionWithIntegerSelectorFieldClass<OtherLibObjT, RangeSetT> fc) noexcept
     {
         _ThisCommonOptionWithSelectorFieldClass::operator=(fc);
         return *this;
@@ -1538,7 +1771,7 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -1556,6 +1789,42 @@ using ConstOptionWithSignedIntegerSelectorFieldClass =
 
 namespace internal {
 
+struct OptionWithUnsignedIntegerSelectorFieldClassTypeDescr
+{
+    using Const = ConstOptionWithUnsignedIntegerSelectorFieldClass;
+    using NonConst = OptionWithUnsignedIntegerSelectorFieldClass;
+};
+
+template <>
+struct TypeDescr<OptionWithUnsignedIntegerSelectorFieldClass> :
+    public OptionWithUnsignedIntegerSelectorFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstOptionWithUnsignedIntegerSelectorFieldClass> :
+    public OptionWithUnsignedIntegerSelectorFieldClassTypeDescr
+{
+};
+
+struct OptionWithSignedIntegerSelectorFieldClassTypeDescr
+{
+    using Const = ConstOptionWithSignedIntegerSelectorFieldClass;
+    using NonConst = OptionWithSignedIntegerSelectorFieldClass;
+};
+
+template <>
+struct TypeDescr<OptionWithSignedIntegerSelectorFieldClass> :
+    public OptionWithSignedIntegerSelectorFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstOptionWithSignedIntegerSelectorFieldClass> :
+    public OptionWithSignedIntegerSelectorFieldClassTypeDescr
+{
+};
+
 template <typename LibObjT>
 struct CommonVariantFieldClassOptionSpec;
 
@@ -1567,6 +1836,11 @@ struct CommonVariantFieldClassOptionSpec<bt_field_class_variant_option> final
     {
         return bt_field_class_variant_option_borrow_field_class(libObjPtr);
     }
+
+    static bt_value *userAttributes(bt_field_class_variant_option * const libObjPtr) noexcept
+    {
+        return bt_field_class_variant_option_borrow_user_attributes(libObjPtr);
+    }
 };
 
 /* Functions specific to constant variant field class options */
@@ -1578,56 +1852,78 @@ struct CommonVariantFieldClassOptionSpec<const bt_field_class_variant_option> fi
     {
         return bt_field_class_variant_option_borrow_field_class_const(libObjPtr);
     }
+
+    static const bt_value *
+    userAttributes(const bt_field_class_variant_option * const libObjPtr) noexcept
+    {
+        return bt_field_class_variant_option_borrow_user_attributes_const(libObjPtr);
+    }
 };
 
 } /* namespace internal */
 
 template <typename LibObjT>
-class CommonVariantFieldClassOption : public internal::BorrowedObj<LibObjT>
+class CommonVariantFieldClassOption : public BorrowedObject<LibObjT>
 {
 private:
-    using typename internal::BorrowedObj<LibObjT>::_ThisBorrowedObj;
-    using typename internal::BorrowedObj<LibObjT>::_LibObjPtr;
-
-    using _FieldClass =
-        typename std::conditional<std::is_const<LibObjT>::value, ConstFieldClass, FieldClass>::type;
+    using typename BorrowedObject<LibObjT>::_ThisBorrowedObject;
+    using _FieldClass = internal::DepFc<LibObjT>;
 
 public:
-    explicit CommonVariantFieldClassOption(const _LibObjPtr libObjPtr) noexcept :
-        _ThisBorrowedObj {libObjPtr}
+    using typename BorrowedObject<LibObjT>::LibObjPtr;
+    using UserAttributes = internal::DepUserAttrs<LibObjT>;
+
+    explicit CommonVariantFieldClassOption(const LibObjPtr libObjPtr) noexcept :
+        _ThisBorrowedObject {libObjPtr}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonVariantFieldClassOption(const CommonVariantFieldClassOption<OtherLibObjT>& fc) noexcept :
-        _ThisBorrowedObj {fc}
+    CommonVariantFieldClassOption(const CommonVariantFieldClassOption<OtherLibObjT> fc) noexcept :
+        _ThisBorrowedObject {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonVariantFieldClassOption&
-    operator=(const CommonVariantFieldClassOption<OtherLibObjT>& fc) noexcept
+    CommonVariantFieldClassOption
+    operator=(const CommonVariantFieldClassOption<OtherLibObjT> fc) noexcept
     {
-        _ThisBorrowedObj::operator=(fc);
+        _ThisBorrowedObject::operator=(fc);
         return *this;
     }
 
-    bpstd::string_view name() const noexcept
+    CommonVariantFieldClassOption<const bt_field_class_variant_option> asConst() const noexcept
     {
-        return bt_field_class_variant_option_get_name(this->libObjPtr());
+        return CommonVariantFieldClassOption<const bt_field_class_variant_option> {*this};
     }
 
-    ConstFieldClass fieldClass() const noexcept
+    bt2c::CStringView name() const noexcept
     {
-        return ConstFieldClass {internal::CommonVariantFieldClassOptionSpec<
-            const bt_field_class_variant_option>::fieldClass(this->libObjPtr())};
+        return bt_field_class_variant_option_get_name(this->libObjPtr());
     }
 
-    _FieldClass fieldClass() noexcept
+    _FieldClass fieldClass() const noexcept
     {
         return _FieldClass {
             internal::CommonVariantFieldClassOptionSpec<LibObjT>::fieldClass(this->libObjPtr())};
     }
+
+    template <typename LibValT>
+    CommonVariantFieldClassOption
+    userAttributes(const CommonMapValue<LibValT> userAttrs) const noexcept
+    {
+        static_assert(!std::is_const<LibObjT>::value,
+                      "Not available with `bt2::ConstVariantFieldClassOption`.");
+
+        bt_field_class_variant_option_set_user_attributes(this->libObjPtr(), userAttrs.libObjPtr());
+        return *this;
+    }
+
+    UserAttributes userAttributes() const noexcept
+    {
+        return UserAttributes {internal::CommonVariantFieldClassOptionSpec<LibObjT>::userAttributes(
+            this->libObjPtr())};
+    }
 };
 
 using VariantFieldClassOption = CommonVariantFieldClassOption<bt_field_class_variant_option>;
@@ -1637,6 +1933,22 @@ using ConstVariantFieldClassOption =
 
 namespace internal {
 
+struct VariantFieldClassOptionTypeDescr
+{
+    using Const = ConstVariantFieldClassOption;
+    using NonConst = VariantFieldClassOption;
+};
+
+template <>
+struct TypeDescr<VariantFieldClassOption> : public VariantFieldClassOptionTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstVariantFieldClassOption> : public VariantFieldClassOptionTypeDescr
+{
+};
+
 template <typename LibObjT>
 struct ConstVariantWithIntegerSelectorFieldClassOptionSpec;
 
@@ -1689,37 +2001,38 @@ struct ConstVariantWithIntegerSelectorFieldClassOptionSpec<
 } /* namespace internal */
 
 template <typename LibObjT>
-class ConstVariantWithIntegerSelectorFieldClassOption : public internal::BorrowedObj<LibObjT>
+class ConstVariantWithIntegerSelectorFieldClassOption : public BorrowedObject<LibObjT>
 {
 private:
-    using typename internal::BorrowedObj<LibObjT>::_ThisBorrowedObj;
-    using typename internal::BorrowedObj<LibObjT>::_LibObjPtr;
+    using typename BorrowedObject<LibObjT>::_ThisBorrowedObject;
     using _Spec = internal::ConstVariantWithIntegerSelectorFieldClassOptionSpec<LibObjT>;
 
 public:
+    using typename BorrowedObject<LibObjT>::LibObjPtr;
+
     using RangeSet = typename std::conditional<
         std::is_same<
             LibObjT,
             const bt_field_class_variant_with_selector_field_integer_unsigned_option>::value,
         ConstUnsignedIntegerRangeSet, ConstSignedIntegerRangeSet>::type;
 
-    explicit ConstVariantWithIntegerSelectorFieldClassOption(const _LibObjPtr libObjPtr) noexcept :
-        _ThisBorrowedObj {libObjPtr}
+    explicit ConstVariantWithIntegerSelectorFieldClassOption(const LibObjPtr libObjPtr) noexcept :
+        _ThisBorrowedObject {libObjPtr}
     {
     }
 
     template <typename OtherLibObjT>
     ConstVariantWithIntegerSelectorFieldClassOption(
-        const ConstVariantWithIntegerSelectorFieldClassOption<OtherLibObjT>& fc) noexcept :
-        _ThisBorrowedObj {fc}
+        const ConstVariantWithIntegerSelectorFieldClassOption<OtherLibObjT> fc) noexcept :
+        _ThisBorrowedObject {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    ConstVariantWithIntegerSelectorFieldClassOption&
-    operator=(const ConstVariantWithIntegerSelectorFieldClassOption<OtherLibObjT>& fc) noexcept
+    ConstVariantWithIntegerSelectorFieldClassOption
+    operator=(const ConstVariantWithIntegerSelectorFieldClassOption<OtherLibObjT> fc) noexcept
     {
-        _ThisBorrowedObj::operator=(fc);
+        _ThisBorrowedObject::operator=(fc);
         return *this;
     }
 
@@ -1728,7 +2041,7 @@ public:
         return ConstVariantFieldClassOption {_Spec::asBaseOption(this->libObjPtr())};
     }
 
-    bpstd::string_view name() const noexcept
+    bt2c::CStringView name() const noexcept
     {
         return this->asBaseOption().name();
     }
@@ -1800,38 +2113,41 @@ private:
     using typename CommonFieldClass<LibObjT>::_ThisCommonFieldClass;
 
 protected:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using _ThisCommonVariantFieldClass = CommonVariantFieldClass<LibObjT>;
 
 public:
-    using Shared = internal::SharedFieldClass<CommonVariantFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonVariantFieldClass<LibObjT>, LibObjT>;
+    using Iterator = BorrowedObjectIterator<CommonVariantFieldClass>;
 
     using Option =
-        typename std::conditional<std::is_const<LibObjT>::value, ConstVariantFieldClassOption,
-                                  VariantFieldClassOption>::type;
+        internal::DepType<LibObjT, VariantFieldClassOption, ConstVariantFieldClassOption>;
 
-    using Iterator = CommonIterator<CommonVariantFieldClass<LibObjT>, Option>;
-
-    explicit CommonVariantFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonVariantFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isVariant());
     }
 
     template <typename OtherLibObjT>
-    CommonVariantFieldClass(const CommonVariantFieldClass<OtherLibObjT>& fc) noexcept :
+    CommonVariantFieldClass(const CommonVariantFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonVariantFieldClass& operator=(const CommonVariantFieldClass<OtherLibObjT>& fc) noexcept
+    CommonVariantFieldClass operator=(const CommonVariantFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonFieldClass::operator=(fc);
         return *this;
     }
 
-    std::uint64_t size() const noexcept
+    CommonVariantFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonVariantFieldClass<const bt_field_class> {*this};
+    }
+
+    std::uint64_t length() const noexcept
     {
         return bt_field_class_variant_get_option_count(this->libObjPtr());
     }
@@ -1843,80 +2159,61 @@ public:
 
     Iterator end() const noexcept
     {
-        return Iterator {*this, this->size()};
+        return Iterator {*this, this->length()};
     }
 
-    ConstVariantFieldClassOption operator[](const std::uint64_t index) const noexcept
-    {
-        return ConstVariantFieldClassOption {
-            internal::CommonVariantFieldClassSpec<const bt_field_class>::optionByIndex(
-                this->libObjPtr(), index)};
-    }
-
-    Option operator[](const std::uint64_t index) noexcept
+    Option operator[](const std::uint64_t index) const noexcept
     {
         return Option {internal::CommonVariantFieldClassSpec<LibObjT>::optionByIndex(
             this->libObjPtr(), index)};
     }
 
-    nonstd::optional<ConstVariantFieldClassOption>
-    operator[](const char * const name) const noexcept
+    OptionalBorrowedObject<Option> operator[](const bt2c::CStringView name) const noexcept
     {
-        const auto libObjPtr =
-            internal::CommonVariantFieldClassSpec<const bt_field_class>::optionByName(
-                this->libObjPtr(), name);
-
-        if (libObjPtr) {
-            return ConstVariantFieldClassOption {libObjPtr};
-        }
-
-        return nonstd::nullopt;
+        return internal::CommonVariantFieldClassSpec<LibObjT>::optionByName(this->libObjPtr(),
+                                                                            name);
     }
 
-    nonstd::optional<ConstVariantFieldClassOption>
-    operator[](const std::string& name) const noexcept
+    Shared shared() const noexcept
     {
-        return (*this)[name.data()];
+        return Shared::createWithRef(*this);
     }
+};
 
-    nonstd::optional<Option> operator[](const char * const name) noexcept
-    {
-        const auto libObjPtr =
-            internal::CommonVariantFieldClassSpec<LibObjT>::optionByName(this->libObjPtr(), name);
+using VariantFieldClass = CommonVariantFieldClass<bt_field_class>;
+using ConstVariantFieldClass = CommonVariantFieldClass<const bt_field_class>;
 
-        if (libObjPtr) {
-            return Option {libObjPtr};
-        }
+namespace internal {
 
-        return nonstd::nullopt;
-    }
+struct VariantFieldClassTypeDescr
+{
+    using Const = ConstVariantFieldClass;
+    using NonConst = VariantFieldClass;
+};
 
-    nonstd::optional<Option> operator[](const std::string& name) noexcept
-    {
-        return (*this)[name.data()];
-    }
+template <>
+struct TypeDescr<VariantFieldClass> : public VariantFieldClassTypeDescr
+{
+};
 
-    Shared shared() const noexcept
-    {
-        return Shared {*this};
-    }
+template <>
+struct TypeDescr<ConstVariantFieldClass> : public VariantFieldClassTypeDescr
+{
 };
 
-using VariantFieldClass = CommonVariantFieldClass<bt_field_class>;
-using ConstVariantFieldClass = CommonVariantFieldClass<const bt_field_class>;
+} /* namespace internal */
 
 template <typename LibObjT>
 class CommonVariantWithoutSelectorFieldClass : public CommonVariantFieldClass<LibObjT>
 {
 private:
     using typename CommonVariantFieldClass<LibObjT>::_ThisCommonVariantFieldClass;
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
 
 public:
-    using Shared =
-        internal::SharedFieldClass<CommonVariantWithoutSelectorFieldClass<LibObjT>, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonVariantWithoutSelectorFieldClass<LibObjT>, LibObjT>;
 
-    explicit CommonVariantWithoutSelectorFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonVariantWithoutSelectorFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonVariantFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isVariantWithoutSelector());
@@ -1924,40 +2221,56 @@ public:
 
     template <typename OtherLibObjT>
     CommonVariantWithoutSelectorFieldClass(
-        const CommonVariantWithoutSelectorFieldClass<OtherLibObjT>& fc) noexcept :
+        const CommonVariantWithoutSelectorFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonVariantFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonVariantWithoutSelectorFieldClass&
-    operator=(const CommonVariantWithoutSelectorFieldClass<OtherLibObjT>& fc) noexcept
+    CommonVariantWithoutSelectorFieldClass
+    operator=(const CommonVariantWithoutSelectorFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonVariantFieldClass::operator=(fc);
         return *this;
     }
 
-    void appendOption(const char * const name, const FieldClass& fc)
+    CommonVariantWithoutSelectorFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonVariantWithoutSelectorFieldClass<const bt_field_class> {*this};
+    }
+
+    CommonVariantWithoutSelectorFieldClass appendOption(const char * const name,
+                                                        const FieldClass fc) const
     {
-        static_assert(!std::is_const<LibObjT>::value, "`LibObjT` must NOT be `const`.");
+        static_assert(!std::is_const<LibObjT>::value,
+                      "Not available with `bt2::ConstVariantWithoutSelectorFieldClass`.");
 
         const auto status = bt_field_class_variant_without_selector_append_option(
             this->libObjPtr(), name, fc.libObjPtr());
 
         if (status ==
             BT_FIELD_CLASS_VARIANT_WITHOUT_SELECTOR_FIELD_APPEND_OPTION_STATUS_MEMORY_ERROR) {
-            throw LibMemoryError {};
+            throw MemoryError {};
         }
+
+        return *this;
     }
 
-    void appendOption(const std::string& name, const FieldClass& fc)
+    CommonVariantWithoutSelectorFieldClass appendOption(const bt2c::CStringView name,
+                                                        const FieldClass fc) const
     {
-        this->appendOption(name.data(), fc);
+        return this->appendOption(name.data(), fc);
+    }
+
+    CommonVariantWithoutSelectorFieldClass appendOption(const bt2s::optional<std::string>& name,
+                                                        const FieldClass fc) const
+    {
+        return this->appendOption(name ? name->data() : nullptr, fc);
     }
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -1967,6 +2280,24 @@ using ConstVariantWithoutSelectorFieldClass =
 
 namespace internal {
 
+struct VariantWithoutSelectorFieldClassTypeDescr
+{
+    using Const = ConstVariantWithoutSelectorFieldClass;
+    using NonConst = VariantWithoutSelectorFieldClass;
+};
+
+template <>
+struct TypeDescr<VariantWithoutSelectorFieldClass> :
+    public VariantWithoutSelectorFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstVariantWithoutSelectorFieldClass> :
+    public VariantWithoutSelectorFieldClassTypeDescr
+{
+};
+
 template <typename OptionT>
 struct CommonVariantWithIntegerSelectorFieldClassSpec;
 
@@ -2039,13 +2370,13 @@ private:
     using typename CommonVariantFieldClass<LibObjT>::_ThisCommonVariantFieldClass;
 
 protected:
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
     using _ThisCommonVariantWithSelectorFieldClass = CommonVariantWithSelectorFieldClass<LibObjT>;
 
 public:
-    using Shared = internal::SharedFieldClass<_ThisCommonVariantWithSelectorFieldClass, LibObjT>;
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<_ThisCommonVariantWithSelectorFieldClass, LibObjT>;
 
-    explicit CommonVariantWithSelectorFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    explicit CommonVariantWithSelectorFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonVariantFieldClass {libObjPtr}
     {
         BT_ASSERT_DBG(this->isVariantWithSelector());
@@ -2053,19 +2384,24 @@ public:
 
     template <typename OtherLibObjT>
     CommonVariantWithSelectorFieldClass(
-        const CommonVariantWithSelectorFieldClass<OtherLibObjT>& fc) noexcept :
+        const CommonVariantWithSelectorFieldClass<OtherLibObjT> fc) noexcept :
         _ThisCommonVariantFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonVariantWithSelectorFieldClass&
-    operator=(const CommonVariantWithSelectorFieldClass<OtherLibObjT>& fc) noexcept
+    CommonVariantWithSelectorFieldClass
+    operator=(const CommonVariantWithSelectorFieldClass<OtherLibObjT> fc) noexcept
     {
         _ThisCommonVariantFieldClass::operator=(fc);
         return *this;
     }
 
+    CommonVariantWithSelectorFieldClass<const bt_field_class> asConst() const noexcept
+    {
+        return CommonVariantWithSelectorFieldClass<const bt_field_class> {*this};
+    }
+
     ConstFieldPath selectorFieldPath() const noexcept
     {
         return ConstFieldPath {
@@ -2075,10 +2411,14 @@ public:
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
+using VariantWithSelectorFieldClass = CommonVariantWithSelectorFieldClass<bt_field_class>;
+using ConstVariantWithSelectorFieldClass =
+    CommonVariantWithSelectorFieldClass<const bt_field_class>;
+
 template <typename LibObjT, typename OptionT>
 class CommonVariantWithIntegerSelectorFieldClass :
     public CommonVariantWithSelectorFieldClass<LibObjT>
@@ -2086,34 +2426,33 @@ class CommonVariantWithIntegerSelectorFieldClass :
 private:
     using typename CommonVariantWithSelectorFieldClass<
         LibObjT>::_ThisCommonVariantWithSelectorFieldClass;
-    using typename CommonFieldClass<LibObjT>::_LibObjPtr;
-    using _ThisCommonVariantWithIntegerSelectorFieldClass =
-        CommonVariantWithIntegerSelectorFieldClass<LibObjT, OptionT>;
 
     using _Spec = internal::CommonVariantWithIntegerSelectorFieldClassSpec<OptionT>;
 
 public:
-    using Shared =
-        internal::SharedFieldClass<_ThisCommonVariantWithIntegerSelectorFieldClass, LibObjT>;
-
+    using typename CommonFieldClass<LibObjT>::LibObjPtr;
+    using Shared = SharedFieldClass<CommonVariantWithIntegerSelectorFieldClass, LibObjT>;
     using Option = OptionT;
 
-    explicit CommonVariantWithIntegerSelectorFieldClass(const _LibObjPtr libObjPtr) noexcept :
+    using Iterator =
+        BorrowedObjectIterator<CommonVariantWithIntegerSelectorFieldClass<LibObjT, Option>>;
+
+    explicit CommonVariantWithIntegerSelectorFieldClass(const LibObjPtr libObjPtr) noexcept :
         _ThisCommonVariantWithSelectorFieldClass {libObjPtr}
     {
-        BT_ASSERT_DBG(this->isVariant());
+        BT_ASSERT_DBG(this->isVariantWithIntegerSelector());
     }
 
     template <typename OtherLibObjT>
     CommonVariantWithIntegerSelectorFieldClass(
-        const CommonVariantWithIntegerSelectorFieldClass<OtherLibObjT, OptionT>& fc) noexcept :
+        const CommonVariantWithIntegerSelectorFieldClass<OtherLibObjT, OptionT> fc) noexcept :
         _ThisCommonVariantWithSelectorFieldClass {fc}
     {
     }
 
     template <typename OtherLibObjT>
-    CommonVariantWithIntegerSelectorFieldClass&
-    operator=(const CommonVariantWithIntegerSelectorFieldClass<OtherLibObjT, OptionT>& fc) noexcept
+    CommonVariantWithIntegerSelectorFieldClass
+    operator=(const CommonVariantWithIntegerSelectorFieldClass<OtherLibObjT, OptionT> fc) noexcept
     {
         _ThisCommonVariantWithSelectorFieldClass::operator=(fc);
         return *this;
@@ -2124,44 +2463,57 @@ public:
         return Option {_Spec::optionByIndex(this->libObjPtr(), index)};
     }
 
-    nonstd::optional<Option> operator[](const char * const name) const noexcept
-    {
-        const auto libObjPtr = _Spec::optionByName(this->libObjPtr(), name);
-
-        if (libObjPtr) {
-            return Option {libObjPtr};
-        }
-
-        return nonstd::nullopt;
-    }
-
-    nonstd::optional<Option> operator[](const std::string& name) const noexcept
+    OptionalBorrowedObject<Option> operator[](const bt2c::CStringView name) const noexcept
     {
-        return (*this)[name.data()];
+        return _Spec::optionByName(this->libObjPtr(), name);
     }
 
-    void appendOption(const char * const name, const FieldClass& fc,
-                      const typename Option::RangeSet& ranges)
+    CommonVariantWithIntegerSelectorFieldClass
+    appendOption(const char * const name, const FieldClass fc,
+                 const typename Option::RangeSet ranges) const
     {
-        static_assert(!std::is_const<LibObjT>::value, "`LibObjT` must NOT be `const`.");
+        static_assert(
+            !std::is_const<LibObjT>::value,
+            "Not available with `bt2::ConstVariantWithUnsignedIntegerSelectorFieldClass`.");
 
         const auto status =
             _Spec::appendOption(this->libObjPtr(), name, fc.libObjPtr(), ranges.libObjPtr());
 
         if (status ==
             BT_FIELD_CLASS_VARIANT_WITH_SELECTOR_FIELD_APPEND_OPTION_STATUS_MEMORY_ERROR) {
-            throw LibMemoryError {};
+            throw MemoryError {};
         }
+
+        return *this;
+    }
+
+    CommonVariantWithIntegerSelectorFieldClass
+    appendOption(const bt2c::CStringView name, const FieldClass fc,
+                 const typename Option::RangeSet ranges) const
+    {
+        return this->appendOption(name.data(), fc, ranges);
+    }
+
+    CommonVariantWithIntegerSelectorFieldClass
+    appendOption(const bt2s::optional<std::string>& name, const FieldClass fc,
+                 const typename Option::RangeSet ranges) const
+    {
+        return this->appendOption(name ? name->data() : nullptr, fc, ranges);
+    }
+
+    Iterator begin() const noexcept
+    {
+        return Iterator {*this, 0};
     }
 
-    void appendOption(const std::string& name, const FieldClass& fc)
+    Iterator end() const noexcept
     {
-        this->appendOption(name.data(), fc);
+        return Iterator {*this, this->length()};
     }
 
     Shared shared() const noexcept
     {
-        return Shared {*this};
+        return Shared::createWithRef(*this);
     }
 };
 
@@ -2178,24 +2530,61 @@ using VariantWithSignedIntegerSelectorFieldClass = CommonVariantWithIntegerSelec
 using ConstVariantWithSignedIntegerSelectorFieldClass = CommonVariantWithIntegerSelectorFieldClass<
     const bt_field_class, ConstVariantWithSignedIntegerSelectorFieldClassOption>;
 
+namespace internal {
+
+struct VariantWithUnsignedIntegerSelectorFieldClassTypeDescr
+{
+    using Const = ConstVariantWithUnsignedIntegerSelectorFieldClass;
+    using NonConst = VariantWithUnsignedIntegerSelectorFieldClass;
+};
+
+template <>
+struct TypeDescr<VariantWithUnsignedIntegerSelectorFieldClass> :
+    public VariantWithUnsignedIntegerSelectorFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstVariantWithUnsignedIntegerSelectorFieldClass> :
+    public VariantWithUnsignedIntegerSelectorFieldClassTypeDescr
+{
+};
+
+struct VariantWithSignedIntegerSelectorFieldClassTypeDescr
+{
+    using Const = ConstVariantWithSignedIntegerSelectorFieldClass;
+    using NonConst = VariantWithSignedIntegerSelectorFieldClass;
+};
+
+template <>
+struct TypeDescr<VariantWithSignedIntegerSelectorFieldClass> :
+    public VariantWithSignedIntegerSelectorFieldClassTypeDescr
+{
+};
+
+template <>
+struct TypeDescr<ConstVariantWithSignedIntegerSelectorFieldClass> :
+    public VariantWithSignedIntegerSelectorFieldClassTypeDescr
+{
+};
+
+} /* namespace internal */
+
 template <typename LibObjT>
 CommonBitArrayFieldClass<LibObjT> CommonFieldClass<LibObjT>::asBitArray() const noexcept
 {
-    BT_ASSERT_DBG(this->isBitArray());
     return CommonBitArrayFieldClass<LibObjT> {this->libObjPtr()};
 }
 
 template <typename LibObjT>
 CommonIntegerFieldClass<LibObjT> CommonFieldClass<LibObjT>::asInteger() const noexcept
 {
-    BT_ASSERT_DBG(this->isInteger());
     return CommonIntegerFieldClass<LibObjT> {this->libObjPtr()};
 }
 
 template <typename LibObjT>
 CommonBaseEnumerationFieldClass<LibObjT> CommonFieldClass<LibObjT>::asEnumeration() const noexcept
 {
-    BT_ASSERT_DBG(this->isEnumeration());
     return CommonBaseEnumerationFieldClass<LibObjT> {this->libObjPtr()};
 }
 
@@ -2220,21 +2609,18 @@ CommonFieldClass<LibObjT>::asSignedEnumeration() const noexcept
 template <typename LibObjT>
 CommonStructureFieldClass<LibObjT> CommonFieldClass<LibObjT>::asStructure() const noexcept
 {
-    BT_ASSERT_DBG(this->isStructure());
     return CommonStructureFieldClass<LibObjT> {this->libObjPtr()};
 }
 
 template <typename LibObjT>
 CommonArrayFieldClass<LibObjT> CommonFieldClass<LibObjT>::asArray() const noexcept
 {
-    BT_ASSERT_DBG(this->isArray());
     return CommonArrayFieldClass<LibObjT> {this->libObjPtr()};
 }
 
 template <typename LibObjT>
 CommonStaticArrayFieldClass<LibObjT> CommonFieldClass<LibObjT>::asStaticArray() const noexcept
 {
-    BT_ASSERT_DBG(this->isStaticArray());
     return CommonStaticArrayFieldClass<LibObjT> {this->libObjPtr()};
 }
 
@@ -2242,14 +2628,12 @@ template <typename LibObjT>
 CommonDynamicArrayWithLengthFieldClass<LibObjT>
 CommonFieldClass<LibObjT>::asDynamicArrayWithLength() const noexcept
 {
-    BT_ASSERT_DBG(this->isDynamicArrayWithLength());
     return CommonDynamicArrayWithLengthFieldClass<LibObjT> {this->libObjPtr()};
 }
 
 template <typename LibObjT>
 CommonOptionFieldClass<LibObjT> CommonFieldClass<LibObjT>::asOption() const noexcept
 {
-    BT_ASSERT_DBG(this->isOption());
     return CommonOptionFieldClass<LibObjT> {this->libObjPtr()};
 }
 
@@ -2257,7 +2641,6 @@ template <typename LibObjT>
 CommonOptionWithSelectorFieldClass<LibObjT>
 CommonFieldClass<LibObjT>::asOptionWithSelector() const noexcept
 {
-    BT_ASSERT_DBG(this->isOptionWithSelector());
     return CommonOptionWithSelectorFieldClass<LibObjT> {this->libObjPtr()};
 }
 
@@ -2265,7 +2648,6 @@ template <typename LibObjT>
 CommonOptionWithBoolSelectorFieldClass<LibObjT>
 CommonFieldClass<LibObjT>::asOptionWithBoolSelector() const noexcept
 {
-    BT_ASSERT_DBG(this->isOptionWithBoolSelector());
     return CommonOptionWithBoolSelectorFieldClass<LibObjT> {this->libObjPtr()};
 }
 
@@ -2290,7 +2672,6 @@ CommonFieldClass<LibObjT>::asOptionWithSignedIntegerSelector() const noexcept
 template <typename LibObjT>
 CommonVariantFieldClass<LibObjT> CommonFieldClass<LibObjT>::asVariant() const noexcept
 {
-    BT_ASSERT_DBG(this->isVariant());
     return CommonVariantFieldClass<LibObjT> {this->libObjPtr()};
 }
 
@@ -2298,7 +2679,6 @@ template <typename LibObjT>
 CommonVariantWithoutSelectorFieldClass<LibObjT>
 CommonFieldClass<LibObjT>::asVariantWithoutSelector() const noexcept
 {
-    BT_ASSERT_DBG(this->isVariantWithoutSelector());
     return CommonVariantWithoutSelectorFieldClass<LibObjT> {this->libObjPtr()};
 }
 
@@ -2306,7 +2686,6 @@ template <typename LibObjT>
 CommonVariantWithSelectorFieldClass<LibObjT>
 CommonFieldClass<LibObjT>::asVariantWithSelector() const noexcept
 {
-    BT_ASSERT_DBG(this->isVariantWithSelector());
     return CommonVariantWithSelectorFieldClass<LibObjT> {this->libObjPtr()};
 }