diff options
Diffstat (limited to 'contrib/llvm-project/libcxx/include/__iterator/projected.h')
| -rw-r--r-- | contrib/llvm-project/libcxx/include/__iterator/projected.h | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/contrib/llvm-project/libcxx/include/__iterator/projected.h b/contrib/llvm-project/libcxx/include/__iterator/projected.h index e74e56d6fb71..463d07b0d33c 100644 --- a/contrib/llvm-project/libcxx/include/__iterator/projected.h +++ b/contrib/llvm-project/libcxx/include/__iterator/projected.h @@ -12,7 +12,7 @@ #include <__config> #include <__iterator/concepts.h> -#include <__iterator/incrementable_traits.h> +#include <__iterator/incrementable_traits.h> // iter_difference_t #include <__type_traits/remove_cvref.h> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) @@ -23,17 +23,29 @@ _LIBCPP_BEGIN_NAMESPACE_STD #if _LIBCPP_STD_VER >= 20 -template<indirectly_readable _It, indirectly_regular_unary_invocable<_It> _Proj> -struct projected { - using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>; - indirect_result_t<_Proj&, _It> operator*() const; // not defined +template <class _It, class _Proj> +struct __projected_impl { + struct __type { + using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>; + indirect_result_t<_Proj&, _It> operator*() const; // not defined + }; }; -template<weakly_incrementable _It, class _Proj> -struct incrementable_traits<projected<_It, _Proj>> { - using difference_type = iter_difference_t<_It>; +template <weakly_incrementable _It, class _Proj> +struct __projected_impl<_It, _Proj> { + struct __type { + using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>; + using difference_type = iter_difference_t<_It>; + indirect_result_t<_Proj&, _It> operator*() const; // not defined + }; }; +// Note that we implement std::projected in a way that satisfies P2538R1 even in standard +// modes before C++26 to avoid breaking the ABI between standard modes (even though ABI +// breaks with std::projected are expected to have essentially no impact). +template <indirectly_readable _It, indirectly_regular_unary_invocable<_It> _Proj> +using projected = typename __projected_impl<_It, _Proj>::__type; + #endif // _LIBCPP_STD_VER >= 20 _LIBCPP_END_NAMESPACE_STD |