Introduce basic_safe_range

[deliverable/binutils-gdb.git] / gdb / gdbsupport / safe-iterator.h

diff --git a/gdb/gdbsupport/safe-iterator.h b/gdb/gdbsupport/safe-iterator.h
index 89aec01884fa60c21610a1a89b994520f3c9d817..1a98b426ab28db2b90d24f582a270cbaa95b91a6 100644 (file)
--- a/gdb/gdbsupport/safe-iterator.h
+++ b/gdb/gdbsupport/safe-iterator.h
@@ -48,17 +48,29 @@ public:
   typedef typename Iterator::iterator_category iterator_category;
   typedef typename Iterator::difference_type difference_type;
 
-  /* Construct by forwarding all arguments to the underlying
-     iterator.  */
-  template<typename... Args>
-  explicit basic_safe_iterator (Args &&...args)
-    : m_it (std::forward<Args> (args)...),
+  /* Construct using the given argument; the end iterator is default
+     constructed.  */
+  template<typename Arg>
+  explicit basic_safe_iterator (Arg &&arg)
+    : m_it (std::forward<Arg> (arg)),
       m_next (m_it)
   {
     if (m_it != m_end)
       ++m_next;
   }
 
+  /* Construct the iterator using the first argument, and construct
+     the end iterator using the second argument.  */
+  template<typename Arg>
+  explicit basic_safe_iterator (Arg &&arg, Arg &&arg2)
+    : m_it (std::forward<Arg> (arg)),
+      m_next (m_it),
+      m_end (std::forward<Arg> (arg2))
+  {
+    if (m_it != m_end)
+      ++m_next;
+  }
+
   /* Create a one-past-end iterator.  */
   basic_safe_iterator ()
   {}
@@ -90,4 +102,34 @@ private:
   Iterator m_end {};
 };
 
+/* A range adapter that wraps another range, and then returns safe
+   iterators wrapping the original range's iterators.  */
+
+template<typename Range>
+class basic_safe_range
+{
+public:
+
+  typedef basic_safe_iterator<typename Range::iterator> iterator;
+
+  explicit basic_safe_range (Range range)
+    : m_range (range)
+  {
+  }
+
+  iterator begin () const
+  {
+    return iterator (m_range.begin (), m_range.end ());
+  }
+
+  iterator end () const
+  {
+    return iterator (m_range.end (), m_range.end ());
+  }
+
+private:
+
+  Range m_range;
+};
+
 #endif /* COMMON_SAFE_ITERATOR_H */