+/*!
+@brief
+ Returns the name of the unknown option for which the parsing error
+ described by \p error occurred.
+
+The returned name includes any <code>-</code> or <code>\--</code>
+prefix.
+
+With the long option with argument form, for example
+<code>\--mireille=deyglun</code>, this function only returns the name
+part (<code>\--mireille</code> in the last example).
+
+You may only call this function if the call to argpar_iter_next() which
+set \p error returned #ARGPAR_ITER_NEXT_STATUS_ERROR_UNKNOWN_OPT.
+
+@param[in] error
+ Parsing error of which to get the name of the unknown option.
+
+@returns
+ Name of the unknown option of \p error.
+
+@pre
+ \p error is not \c NULL.
+@pre
+ The call to argpar_iter_next() which set \p error returned
+ #ARGPAR_ITER_NEXT_STATUS_ERROR_UNKNOWN_OPT.
+*/
+/// @cond hidden_macro
+ARGPAR_HIDDEN
+/// @endcond
+const char *argpar_error_unknown_opt_name(const struct argpar_error *error);
+
+/*!
+@brief
+ Returns the descriptor of the option for which the parsing error
+ described by \p error occurred.
+
+You may only call this function if the call to argpar_iter_next() which
+set \p error returned #ARGPAR_ITER_NEXT_STATUS_ERROR_MISSING_OPT_ARG or
+#ARGPAR_ITER_NEXT_STATUS_ERROR_UNEXPECTED_OPG_ARG.
+
+@param[in] error
+ Parsing error of which to get the option descriptor.
+@param[out] is_short
+ @parblock
+ If not \c NULL, this function sets \p *is_short to:
+
+ - \c true if the option for which \p error occurred is a short
+ option.
+
+ - \c false if the option for which \p error occurred is a long
+ option.
+ @endparblock
+
+@returns
+ Descriptor of the option of \p error.
+
+@pre
+ \p error is not \c NULL.
+@pre
+ The call to argpar_iter_next() which set \p error returned
+ #ARGPAR_ITER_NEXT_STATUS_ERROR_MISSING_OPT_ARG or
+ #ARGPAR_ITER_NEXT_STATUS_ERROR_UNEXPECTED_OPG_ARG.
+*/
+/// @cond hidden_macro
+ARGPAR_HIDDEN
+/// @endcond
+const struct argpar_opt_descr *argpar_error_opt_descr(
+ const struct argpar_error *error, bool *is_short);
+
+/*!
+@brief
+ Destroys the parsing error \p error.
+
+@param[in] error
+ Parsing error to destroy (may be \c NULL).
+*/
+/// @cond hidden_macro
+ARGPAR_HIDDEN
+/// @endcond
+void argpar_error_destroy(const struct argpar_error *error);
+
+/// @}
+
+/*!
+@name Iterator API
+@{
+*/
+
+/*!
+@brief
+ Option descriptor
+
+argpar_iter_create() accepts an array of instances of such a type,
+terminated with #ARGPAR_OPT_DESCR_SENTINEL, as its \p descrs parameter.
+
+The typical usage is, for example:
+
+@code
+const struct argpar_opt_descr descrs[] = {
+ { 0, 'd', NULL, false },
+ { 1, '\0', "squeeze", true },
+ { 2, 'm', "meow", true },
+ ARGPAR_OPT_DESCR_SENTINEL,
+};
+@endcode
+*/
+struct argpar_opt_descr {
+ /// Numeric ID, to uniquely identify this descriptor
+ const int id;
+
+ /// Short option character, or <code>'\0'</code>
+ const char short_name;
+
+ /// Long option name (without the <code>\--</code> prefix), or \c NULL
+ const char * const long_name;
+
+ /// \c true if this option has an argument
+ const bool with_arg;
+};
+
+/*!
+@brief
+ Sentinel for an option descriptor array
+
+The typical usage is, for example:
+
+@code
+const struct argpar_opt_descr descrs[] = {
+ { 0, 'd', NULL, false },
+ { 1, '\0', "squeeze", true },
+ { 2, 'm', "meow", true },
+ ARGPAR_OPT_DESCR_SENTINEL,
+};
+@endcode
+*/
+#define ARGPAR_OPT_DESCR_SENTINEL { -1, '\0', NULL, false }
+
+/*!
+@struct argpar_iter
+
+@brief
+ Opaque argpar iterator type
+
+argpar_iter_create() returns a pointer to such a type.
+*/
+struct argpar_iter;
+
+/*!
+@brief
+ Creates and returns an argument parsing iterator to parse the
+ original arguments \p argv of which the count is \p argc using the
+ option descriptors \p descrs.
+
+This function initializes the returned structure, but doesn't actually
+start parsing the arguments.
+
+argpar considers \em all the elements of \p argv, including the first
+one, so that you would typically pass <code>(argc - 1)</code> as \p argc
+and <code>\&argv[1]</code> as \p argv from what <code>main()</code>
+receives, or ignore the parsing item of the first call to
+argpar_iter_next().
+
+\p *argv and \p *descrs must \em not change for all of:
+
+- The lifetime of the returned iterator (until you call
+ argpar_iter_destroy()).
+
+- The lifetime of any parsing item (until you call
+ argpar_item_destroy()) which argpar_iter_next() creates from the
+ returned iterator.
+
+- The lifetime of any parsing error (until you call
+ argpar_error_destroy()) which argpar_iter_next() creates from the
+ returned iterator.
+
+@param[in] argc
+ Number of original arguments to parse in \p argv.
+@param[in] argv
+ Original arguments to parse, of which the count is \p argc.
+@param[in] descrs
+ @parblock
+ Option descriptor array, terminated with #ARGPAR_OPT_DESCR_SENTINEL.
+
+ May contain duplicate entries.
+ @endparblock
+
+@returns
+ New argument parsing iterator, or \c NULL on memory error.
+
+@pre
+ \p argc is greater than 0.
+@pre
+ \p argv is not \c NULL.
+@pre
+ The first \p argc elements of \p argv are not \c NULL.
+@pre
+ \p descrs is not \c NULL.
+
+@sa
+ argpar_iter_destroy() -- Destroys an argument parsing iterator.
+*/
+/// @cond hidden_macro