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[libc++] Guard uses of is_transparent and iterator_concept #166495

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[libc++] Guard uses of is_transparent and iterator_concept #166495

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4 changes: 3 additions & 1 deletion libcxx/include/__filesystem/path_iterator.h
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,9 @@ class _LIBCPP_EXPORTED_FROM_ABI path::iterator {

public:
typedef input_iterator_tag iterator_category;
typedef bidirectional_iterator_tag iterator_concept;
# if _LIBCPP_STD_VER >= 20
using iterator_concept = bidirectional_iterator_tag;
# endif

typedef path value_type;
typedef ptrdiff_t difference_type;
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2 changes: 2 additions & 0 deletions libcxx/include/__functional/identity.h
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Expand Up @@ -30,7 +30,9 @@ struct __identity {
return std::forward<_Tp>(__t);
}

#if _LIBCPP_STD_VER >= 14
using is_transparent = void;
#endif
};

template <>
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4 changes: 4 additions & 0 deletions libcxx/include/__iterator/iterator_traits.h
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Expand Up @@ -351,16 +351,20 @@ struct iterator_traits<_Tp*> {
template <class _Tp>
using __iterator_category _LIBCPP_NODEBUG = typename _Tp::iterator_category;

#if _LIBCPP_STD_VER >= 20
template <class _Tp>
using __iterator_concept _LIBCPP_NODEBUG = typename _Tp::iterator_concept;
#endif

template <class _Tp, class _Up>
using __has_iterator_category_convertible_to _LIBCPP_NODEBUG =
is_convertible<__detected_or_t<__nat, __iterator_category, iterator_traits<_Tp> >, _Up>;

#if _LIBCPP_STD_VER >= 20
template <class _Tp, class _Up>
using __has_iterator_concept_convertible_to _LIBCPP_NODEBUG =
is_convertible<__detected_or_t<__nat, __iterator_concept, _Tp>, _Up>;
#endif

template <class _Tp>
using __has_input_iterator_category _LIBCPP_NODEBUG = __has_iterator_category_convertible_to<_Tp, input_iterator_tag>;
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