libstdc++: Implement P1878R1 "Constraining Readable Types"
* include/bits/iterator_concepts.h (iter_difference_t, iter_value_t): Use remove_cvref_t. (readable_traits): Rename to indirectly_readable_traits. (readable): Rename to indirectly_readable. (writable): Rename to indirectly_writable. (__detail::__iter_exchange_move): Do not use remove_reference_t. (indirectly_swappable): Adjust requires expression parameter types. expression. * include/bits/ranges_algo.h (ranges::transform, ranges::replace) (ranges::replace_if, ranges::generate_n, ranges::generate) (ranges::remove): Use new name for writable. * include/bits/stl_iterator.h (__detail::__common_iter_has_arrow): Use new name for readable. * include/ext/pointer.h (readable_traits<_Pointer_adapter<P>>): Use new name for readable_traits. * testsuite/24_iterators/associated_types/readable.traits.cc: Likewise. * testsuite/24_iterators/indirect_callable/projected.cc: Adjust for new definition of indirectly_readable.
This commit is contained in:
parent
d222d8ec3c
commit
c8dd2446f5
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@ -1,5 +1,24 @@
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2020-02-07 Jonathan Wakely <jwakely@redhat.com>
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* include/bits/iterator_concepts.h (iter_difference_t, iter_value_t):
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Use remove_cvref_t.
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(readable_traits): Rename to indirectly_readable_traits.
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(readable): Rename to indirectly_readable.
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(writable): Rename to indirectly_writable.
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(__detail::__iter_exchange_move): Do not use remove_reference_t.
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(indirectly_swappable): Adjust requires expression parameter types.
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expression.
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* include/bits/ranges_algo.h (ranges::transform, ranges::replace)
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(ranges::replace_if, ranges::generate_n, ranges::generate)
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(ranges::remove): Use new name for writable.
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* include/bits/stl_iterator.h (__detail::__common_iter_has_arrow):
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Use new name for readable.
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* include/ext/pointer.h (readable_traits<_Pointer_adapter<P>>): Use
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new name for readable_traits.
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* testsuite/24_iterators/associated_types/readable.traits.cc: Likewise.
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* testsuite/24_iterators/indirect_callable/projected.cc: Adjust for
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new definition of indirectly_readable.
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* include/bits/stl_iterator.h (__detail::__common_iter_ptr): Change
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to take parameters of common_iterator, instead of the common_iterator
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type itself. Fix argument for __common_iter_has_arrow constraint.
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@ -173,11 +173,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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// ITER_TRAITS
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template<typename _Iter, typename _Tp = _Iter>
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using __iter_traits = typename __iter_traits_impl<_Iter, _Tp>::type;
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template<typename _Tp>
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using __iter_diff_t = typename
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__iter_traits<_Tp, incrementable_traits<_Tp>>::difference_type;
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} // namespace __detail
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template<typename _Tp>
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using iter_difference_t = typename
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__detail::__iter_traits<_Tp, incrementable_traits<_Tp>>::difference_type;
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using iter_difference_t = __detail::__iter_diff_t<remove_cvref_t<_Tp>>;
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namespace __detail
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{
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@ -188,35 +191,41 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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{ using value_type = remove_cv_t<_Tp>; };
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} // namespace __detail
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template<typename> struct readable_traits { };
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template<typename> struct indirectly_readable_traits { };
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template<typename _Tp>
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struct readable_traits<_Tp*>
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struct indirectly_readable_traits<_Tp*>
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: __detail::__cond_value_type<_Tp>
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{ };
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template<typename _Iter> requires is_array_v<_Iter>
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struct readable_traits<_Iter>
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struct indirectly_readable_traits<_Iter>
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{ using value_type = remove_cv_t<remove_extent_t<_Iter>>; };
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template<typename _Iter>
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struct readable_traits<const _Iter>
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: readable_traits<_Iter>
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struct indirectly_readable_traits<const _Iter>
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: indirectly_readable_traits<_Iter>
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{ };
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template<typename _Tp> requires requires { typename _Tp::value_type; }
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struct readable_traits<_Tp>
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struct indirectly_readable_traits<_Tp>
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: __detail::__cond_value_type<typename _Tp::value_type>
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{ };
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template<typename _Tp> requires requires { typename _Tp::element_type; }
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struct readable_traits<_Tp>
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struct indirectly_readable_traits<_Tp>
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: __detail::__cond_value_type<typename _Tp::element_type>
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{ };
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namespace __detail
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{
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template<typename _Tp>
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using iter_value_t = typename
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__detail::__iter_traits<_Tp, readable_traits<_Tp>>::value_type;
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using __iter_value_t = typename
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__iter_traits<_Tp, indirectly_readable_traits<_Tp>>::value_type;
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} // namespace __detail
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template<typename _Tp>
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using iter_value_t = __detail::__iter_value_t<remove_cvref_t<_Tp>>;
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namespace __detail
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{
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@ -235,11 +244,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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&& requires(_Iter __it)
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{
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typename incrementable_traits<_Iter>::difference_type;
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typename readable_traits<_Iter>::value_type;
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typename indirectly_readable_traits<_Iter>::value_type;
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typename common_reference_t<iter_reference_t<_Iter>&&,
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typename readable_traits<_Iter>::value_type&>;
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typename indirectly_readable_traits<_Iter>::value_type&>;
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typename common_reference_t<decltype(*__it++)&&,
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typename readable_traits<_Iter>::value_type&>;
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typename indirectly_readable_traits<_Iter>::value_type&>;
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requires signed_integral<typename incrementable_traits<_Iter>::difference_type>;
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};
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@ -248,7 +257,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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&& constructible_from<_Iter>
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&& is_lvalue_reference_v<iter_reference_t<_Iter>>
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&& same_as<remove_cvref_t<iter_reference_t<_Iter>>,
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typename readable_traits<_Iter>::value_type>
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typename indirectly_readable_traits<_Iter>::value_type>
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&& requires(_Iter __it)
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{
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{ __it++ } -> convertible_to<const _Iter&>;
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@ -290,6 +299,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<typename _Iter>
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concept __iter_without_nested_types = !__iter_with_nested_types<_Iter>;
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// FIXME: These have to be at namespace-scope because of PR 92103.
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template<typename _Iter, bool __use_arrow = false>
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struct __ptr
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{ using type = void; };
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@ -376,7 +386,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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{
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using iterator_category = typename __detail::__cat<_Iterator>::type;
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using value_type
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= typename readable_traits<_Iterator>::value_type;
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= typename indirectly_readable_traits<_Iterator>::value_type;
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using difference_type
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= typename incrementable_traits<_Iterator>::difference_type;
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using pointer = typename __detail::__ptr<_Iterator, true>::type;
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@ -429,15 +439,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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// ITER_CONCEPT
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template<typename _Iter>
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using __iter_concept = typename __iter_concept_impl<_Iter>::type;
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} // namespace __detail
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/// Requirements for types that are readable by applying operator*.
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template<typename _In>
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concept readable = requires
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concept __indirectly_readable_impl = requires(const _In __in)
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{
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typename iter_value_t<_In>;
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typename iter_reference_t<_In>;
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typename iter_rvalue_reference_t<_In>;
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{ *__in } -> same_as<iter_reference_t<_In>>;
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{ ranges::iter_move(__in) } -> same_as<iter_rvalue_reference_t<_In>>;
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}
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&& common_reference_with<iter_reference_t<_In>&&, iter_value_t<_In>&>
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&& common_reference_with<iter_reference_t<_In>&&,
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&& common_reference_with<iter_rvalue_reference_t<_In>&&,
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const iter_value_t<_In>&>;
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template<readable _Tp>
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} // namespace __detail
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/// Requirements for types that are readable by applying operator*.
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template<typename _In>
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concept indirectly_readable
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= __detail::__indirectly_readable_impl<remove_cvref_t<_In>>;
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template<indirectly_readable _Tp>
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using iter_common_reference_t
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= common_reference_t<iter_reference_t<_Tp>, iter_value_t<_Tp>&>;
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/// Requirements for writing a value into an iterator's referenced object.
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template<typename _Out, typename _Tp>
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concept writable = requires(_Out&& __o, _Tp&& __t)
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concept indirectly_writable = requires(_Out&& __o, _Tp&& __t)
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{
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*__o = std::forward<_Tp>(__t);
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*std::forward<_Out>(__o) = std::forward<_Tp>(__t);
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template<typename _Iter>
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concept input_iterator = input_or_output_iterator<_Iter>
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&& readable<_Iter>
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&& indirectly_readable<_Iter>
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&& requires { typename __detail::__iter_concept<_Iter>; }
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&& derived_from<__detail::__iter_concept<_Iter>, input_iterator_tag>;
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template<typename _Iter, typename _Tp>
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concept output_iterator = input_or_output_iterator<_Iter>
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&& writable<_Iter, _Tp>
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&& indirectly_writable<_Iter, _Tp>
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&& requires(_Iter __i, _Tp&& __t) { *__i++ = std::forward<_Tp>(__t); };
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template<typename _Iter>
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@ -579,7 +596,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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// [indirectcallable.indirectinvocable], indirect callables
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template<typename _Fn, typename _Iter>
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concept indirectly_unary_invocable = readable<_Iter>
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concept indirectly_unary_invocable = indirectly_readable<_Iter>
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&& copy_constructible<_Fn> && invocable<_Fn&, iter_value_t<_Iter>&>
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&& invocable<_Fn&, iter_reference_t<_Iter>>
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&& invocable<_Fn&, iter_common_reference_t<_Iter>>
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invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
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template<typename _Fn, typename _Iter>
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concept indirectly_regular_unary_invocable = readable<_Iter>
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concept indirectly_regular_unary_invocable = indirectly_readable<_Iter>
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&& copy_constructible<_Fn>
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&& regular_invocable<_Fn&, iter_value_t<_Iter>&>
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&& regular_invocable<_Fn&, iter_reference_t<_Iter>>
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invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
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template<typename _Fn, typename _Iter>
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concept indirect_unary_predicate = readable<_Iter>
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concept indirect_unary_predicate = indirectly_readable<_Iter>
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&& copy_constructible<_Fn> && predicate<_Fn&, iter_value_t<_Iter>&>
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&& predicate<_Fn&, iter_reference_t<_Iter>>
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&& predicate<_Fn&, iter_common_reference_t<_Iter>>;
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template<typename _Fn, typename _I1, typename _I2>
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concept indirect_binary_predicate = readable<_I1> && readable<_I2>
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concept indirect_binary_predicate
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= indirectly_readable<_I1> && indirectly_readable<_I2>
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&& copy_constructible<_Fn>
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&& predicate<_Fn&, iter_value_t<_I1>&, iter_value_t<_I2>&>
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&& predicate<_Fn&, iter_value_t<_I1>&, iter_reference_t<_I2>>
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iter_common_reference_t<_I2>>;
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template<typename _Fn, typename _I1, typename _I2 = _I1>
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concept indirect_equivalence_relation = readable<_I1> && readable<_I2>
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concept indirect_equivalence_relation
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= indirectly_readable<_I1> && indirectly_readable<_I2>
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&& copy_constructible<_Fn>
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&& equivalence_relation<_Fn&, iter_value_t<_I1>&, iter_value_t<_I2>&>
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&& equivalence_relation<_Fn&, iter_value_t<_I1>&, iter_reference_t<_I2>>
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iter_common_reference_t<_I2>>;
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template<typename _Fn, typename _I1, typename _I2 = _I1>
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concept indirect_strict_weak_order = readable<_I1> && readable<_I2>
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concept indirect_strict_weak_order
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= indirectly_readable<_I1> && indirectly_readable<_I2>
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&& copy_constructible<_Fn>
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&& strict_weak_order<_Fn&, iter_value_t<_I1>&, iter_value_t<_I2>&>
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&& strict_weak_order<_Fn&, iter_value_t<_I1>&, iter_reference_t<_I2>>
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iter_common_reference_t<_I2>>;
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template<typename _Fn, typename... _Is>
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requires (readable<_Is> && ...)
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requires (indirectly_readable<_Is> && ...)
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&& invocable<_Fn, iter_reference_t<_Is>...>
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using indirect_result_t = invoke_result_t<_Fn, iter_reference_t<_Is>...>;
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/// [projected], projected
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template<readable _Iter, indirectly_regular_unary_invocable<_Iter> _Proj>
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template<indirectly_readable _Iter,
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indirectly_regular_unary_invocable<_Iter> _Proj>
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struct projected
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{
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using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
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/// [alg.req.ind.move], concept `indirectly_movable`
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template<typename _In, typename _Out>
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concept indirectly_movable = readable<_In>
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&& writable<_Out, iter_rvalue_reference_t<_In>>;
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concept indirectly_movable = indirectly_readable<_In>
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&& indirectly_writable<_Out, iter_rvalue_reference_t<_In>>;
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template<typename _In, typename _Out>
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concept indirectly_movable_storable = indirectly_movable<_In, _Out>
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&& writable<_Out, iter_value_t<_In>> && movable<iter_value_t<_In>>
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&& indirectly_writable<_Out, iter_value_t<_In>>
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&& movable<iter_value_t<_In>>
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&& constructible_from<iter_value_t<_In>, iter_rvalue_reference_t<_In>>
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&& assignable_from<iter_value_t<_In>&, iter_rvalue_reference_t<_In>>;
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/// [alg.req.ind.copy], concept `indirectly_copyable`
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template<typename _In, typename _Out>
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concept indirectly_copyable = readable<_In>
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&& writable<_Out, iter_reference_t<_In>>;
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concept indirectly_copyable = indirectly_readable<_In>
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&& indirectly_writable<_Out, iter_reference_t<_In>>;
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template<typename _In, typename _Out>
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concept indirectly_copyable_storable = indirectly_copyable<_In, _Out>
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&& writable<_Out, const iter_value_t<_In>&>
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&& indirectly_writable<_Out, const iter_value_t<_In>&>
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&& copyable<iter_value_t<_In>>
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&& constructible_from<iter_value_t<_In>, iter_reference_t<_In>>
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&& assignable_from<iter_value_t<_In>&, iter_reference_t<_In>>;
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};
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template<typename _Xp, typename _Yp>
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constexpr iter_value_t<remove_reference_t<_Xp>>
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constexpr iter_value_t<_Xp>
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__iter_exchange_move(_Xp&& __x, _Yp&& __y)
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noexcept(noexcept(iter_value_t<remove_reference_t<_Xp>>(iter_move(__x)))
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noexcept(noexcept(iter_value_t<_Xp>(iter_move(__x)))
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&& noexcept(*__x = iter_move(__y)))
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{
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iter_value_t<remove_reference_t<_Xp>> __old_value(iter_move(__x));
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iter_value_t<_Xp> __old_value(iter_move(__x));
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*__x = iter_move(__y);
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return __old_value;
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}
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if constexpr (__adl_iswap<_Tp, _Up>)
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return noexcept(iter_swap(std::declval<_Tp>(),
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std::declval<_Up>()));
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else if constexpr (readable<_Tp> && readable<_Up>
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else if constexpr (indirectly_readable<_Tp>
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&& indirectly_readable<_Up>
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&& swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
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return noexcept(ranges::swap(*std::declval<_Tp>(),
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*std::declval<_Up>()));
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public:
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template<typename _Tp, typename _Up>
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requires __adl_iswap<_Tp, _Up>
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|| (readable<remove_reference_t<_Tp>>
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&& readable<remove_reference_t<_Up>>
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|| (indirectly_readable<remove_reference_t<_Tp>>
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&& indirectly_readable<remove_reference_t<_Up>>
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&& swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
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|| (indirectly_movable_storable<_Tp, _Up>
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&& indirectly_movable_storable<_Up, _Tp>)
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{
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if constexpr (__adl_iswap<_Tp, _Up>)
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iter_swap(static_cast<_Tp&&>(__e1), static_cast<_Up&&>(__e2));
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else if constexpr (readable<_Tp> && readable<_Up>
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else if constexpr (indirectly_readable<_Tp>
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&& indirectly_readable<_Up>
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&& swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
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ranges::swap(*__e1, *__e2);
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else
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/// [alg.req.ind.swap], concept `indirectly_swappable`
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template<typename _I1, typename _I2 = _I1>
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concept indirectly_swappable = readable<_I1> && readable<_I2>
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&& requires(_I1& __i1, _I2& __i2)
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concept indirectly_swappable
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= indirectly_readable<_I1> && indirectly_readable<_I2>
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&& requires(const _I1 __i1, const _I2 __i2)
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{
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ranges::iter_swap(__i1, __i1);
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ranges::iter_swap(__i2, __i2);
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@ -1219,7 +1219,9 @@ namespace ranges
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template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
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weakly_incrementable _Out,
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copy_constructible _Fp, typename _Proj = identity>
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requires writable<_Out, indirect_result_t<_Fp&, projected<_Iter, _Proj>>>
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requires indirectly_writable<_Out,
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indirect_result_t<_Fp&,
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projected<_Iter, _Proj>>>
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constexpr unary_transform_result<_Iter, _Out>
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transform(_Iter __first1, _Sent __last1, _Out __result,
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_Fp __op, _Proj __proj = {})
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template<input_range _Range, weakly_incrementable _Out,
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copy_constructible _Fp, typename _Proj = identity>
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requires writable<_Out,
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indirect_result_t<_Fp&, projected<iterator_t<_Range>,
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||||
_Proj>>>
|
||||
requires indirectly_writable<_Out,
|
||||
indirect_result_t<_Fp&,
|
||||
projected<iterator_t<_Range>, _Proj>>>
|
||||
constexpr unary_transform_result<safe_iterator_t<_Range>, _Out>
|
||||
transform(_Range&& __r, _Out __result, _Fp __op, _Proj __proj = {})
|
||||
{
|
||||
|
@ -1268,7 +1270,9 @@ namespace ranges
|
|||
input_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
|
||||
weakly_incrementable _Out, copy_constructible _Fp,
|
||||
typename _Proj1 = identity, typename _Proj2 = identity>
|
||||
requires writable<_Out, indirect_result_t<_Fp&, projected<_Iter1, _Proj1>,
|
||||
requires indirectly_writable<_Out,
|
||||
indirect_result_t<_Fp&,
|
||||
projected<_Iter1, _Proj1>,
|
||||
projected<_Iter2, _Proj2>>>
|
||||
constexpr binary_transform_result<_Iter1, _Iter2, _Out>
|
||||
transform(_Iter1 __first1, _Sent1 __last1, _Iter2 __first2, _Sent2 __last2,
|
||||
|
@ -1286,11 +1290,10 @@ namespace ranges
|
|||
template<input_range _Range1, input_range _Range2,
|
||||
weakly_incrementable _Out, copy_constructible _Fp,
|
||||
typename _Proj1 = identity, typename _Proj2 = identity>
|
||||
requires writable<_Out, indirect_result_t<_Fp&,
|
||||
projected<iterator_t<_Range1>,
|
||||
_Proj1>,
|
||||
projected<iterator_t<_Range2>,
|
||||
_Proj2>>>
|
||||
requires indirectly_writable<_Out,
|
||||
indirect_result_t<_Fp&,
|
||||
projected<iterator_t<_Range1>, _Proj1>,
|
||||
projected<iterator_t<_Range2>, _Proj2>>>
|
||||
constexpr binary_transform_result<safe_iterator_t<_Range1>,
|
||||
safe_iterator_t<_Range2>, _Out>
|
||||
transform(_Range1&& __r1, _Range2&& __r2, _Out __result,
|
||||
|
@ -1304,9 +1307,9 @@ namespace ranges
|
|||
|
||||
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
|
||||
typename _Tp1, typename _Tp2, typename _Proj = identity>
|
||||
requires writable<_Iter, const _Tp2&> &&
|
||||
indirect_binary_predicate<ranges::equal_to,
|
||||
projected<_Iter, _Proj>, const _Tp1*>
|
||||
requires indirectly_writable<_Iter, const _Tp2&>
|
||||
&& indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>,
|
||||
const _Tp1*>
|
||||
constexpr _Iter
|
||||
replace(_Iter __first, _Sent __last,
|
||||
const _Tp1& __old_value, const _Tp2& __new_value,
|
||||
|
@ -1320,8 +1323,8 @@ namespace ranges
|
|||
|
||||
template<input_range _Range,
|
||||
typename _Tp1, typename _Tp2, typename _Proj = identity>
|
||||
requires writable<iterator_t<_Range>, const _Tp2&> &&
|
||||
indirect_binary_predicate<ranges::equal_to,
|
||||
requires indirectly_writable<iterator_t<_Range>, const _Tp2&>
|
||||
&& indirect_binary_predicate<ranges::equal_to,
|
||||
projected<iterator_t<_Range>, _Proj>,
|
||||
const _Tp1*>
|
||||
constexpr safe_iterator_t<_Range>
|
||||
|
@ -1336,7 +1339,7 @@ namespace ranges
|
|||
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
|
||||
typename _Tp, typename _Proj = identity,
|
||||
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
|
||||
requires writable<_Iter, const _Tp&>
|
||||
requires indirectly_writable<_Iter, const _Tp&>
|
||||
constexpr _Iter
|
||||
replace_if(_Iter __first, _Sent __last,
|
||||
_Pred __pred, const _Tp& __new_value, _Proj __proj = {})
|
||||
|
@ -1349,7 +1352,7 @@ namespace ranges
|
|||
|
||||
template<input_range _Range, typename _Tp, typename _Proj = identity,
|
||||
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
|
||||
requires writable<iterator_t<_Range>, const _Tp&>
|
||||
requires indirectly_writable<iterator_t<_Range>, const _Tp&>
|
||||
constexpr safe_iterator_t<_Range>
|
||||
replace_if(_Range&& __r,
|
||||
_Pred __pred, const _Tp& __new_value, _Proj __proj = {})
|
||||
|
@ -1496,7 +1499,8 @@ namespace ranges
|
|||
}
|
||||
|
||||
template<input_or_output_iterator _Out, copy_constructible _Fp>
|
||||
requires invocable<_Fp&> && writable<_Out, invoke_result_t<_Fp&>>
|
||||
requires invocable<_Fp&>
|
||||
&& indirectly_writable<_Out, invoke_result_t<_Fp&>>
|
||||
constexpr _Out
|
||||
generate_n(_Out __first, iter_difference_t<_Out> __n, _Fp __gen)
|
||||
{
|
||||
|
@ -1507,7 +1511,8 @@ namespace ranges
|
|||
|
||||
template<input_or_output_iterator _Out, sentinel_for<_Out> _Sent,
|
||||
copy_constructible _Fp>
|
||||
requires invocable<_Fp&> && writable<_Out, invoke_result_t<_Fp&>>
|
||||
requires invocable<_Fp&>
|
||||
&& indirectly_writable<_Out, invoke_result_t<_Fp&>>
|
||||
constexpr _Out
|
||||
generate(_Out __first, _Sent __last, _Fp __gen)
|
||||
{
|
||||
|
@ -1573,8 +1578,8 @@ namespace ranges
|
|||
}
|
||||
|
||||
template<forward_range _Range, typename _Tp, typename _Proj = identity>
|
||||
requires permutable<iterator_t<_Range>> &&
|
||||
indirect_binary_predicate<ranges::equal_to,
|
||||
requires permutable<iterator_t<_Range>>
|
||||
&& indirect_binary_predicate<ranges::equal_to,
|
||||
projected<iterator_t<_Range>, _Proj>,
|
||||
const _Tp*>
|
||||
constexpr safe_subrange_t<_Range>
|
||||
|
|
|
@ -1417,7 +1417,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|||
};
|
||||
|
||||
template<typename _It>
|
||||
concept __common_iter_has_arrow = readable<const _It>
|
||||
concept __common_iter_has_arrow = indirectly_readable<const _It>
|
||||
&& (requires(const _It& __it) { __it.operator->(); }
|
||||
|| is_reference_v<iter_reference_t<_It>>
|
||||
|| constructible_from<iter_value_t<_It>, iter_reference_t<_It>>);
|
||||
|
|
|
@ -47,7 +47,7 @@
|
|||
# include <bits/ptr_traits.h>
|
||||
#endif
|
||||
#if __cplusplus > 201703L
|
||||
# include <iterator> // for readable_traits
|
||||
# include <iterator> // for indirectly_readable_traits
|
||||
#endif
|
||||
|
||||
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
|
||||
|
@ -598,11 +598,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|||
};
|
||||
|
||||
#if __cpp_lib_concepts
|
||||
template<typename _Storage_policy>
|
||||
struct readable_traits<__gnu_cxx::_Pointer_adapter<_Storage_policy>>
|
||||
template<typename _Policy>
|
||||
struct indirectly_readable_traits<__gnu_cxx::_Pointer_adapter<_Policy>>
|
||||
{
|
||||
using value_type
|
||||
= typename __gnu_cxx::_Pointer_adapter<_Storage_policy>::value_type;
|
||||
= typename __gnu_cxx::_Pointer_adapter<_Policy>::value_type;
|
||||
};
|
||||
#endif
|
||||
_GLIBCXX_END_NAMESPACE_VERSION
|
||||
|
|
|
@ -24,9 +24,9 @@ struct none;
|
|||
|
||||
template<typename T>
|
||||
concept has_readable_traits_type
|
||||
= requires { typename std::readable_traits<T>::value_type; };
|
||||
= requires { typename std::indirectly_readable_traits<T>::value_type; };
|
||||
|
||||
// Check std::readable_traits<T>::value_type is U (or doesn't exist).
|
||||
// Check std::indirectly_readable_traits<T>::value_type is U (or doesn't exist).
|
||||
template<typename T, typename U>
|
||||
concept check_readable_traits
|
||||
= (has_readable_traits_type<T> != std::same_as<U, none>);
|
||||
|
@ -62,7 +62,7 @@ static_assert( check_readable_traits<const D, none> );
|
|||
|
||||
struct E { };
|
||||
template<>
|
||||
struct std::readable_traits<E> { using value_type = long; };
|
||||
struct std::indirectly_readable_traits<E> { using value_type = long; };
|
||||
static_assert( check_readable_traits<E, long> );
|
||||
static_assert( check_readable_traits<const E, long> );
|
||||
|
||||
|
@ -103,7 +103,7 @@ static_assert( check_alias<F, std::iterator_traits<F>::value_type> );
|
|||
|
||||
struct G { };
|
||||
template<>
|
||||
struct std::readable_traits<G> { using value_type = G; };
|
||||
struct std::indirectly_readable_traits<G> { using value_type = G; };
|
||||
template<>
|
||||
struct std::iterator_traits<G> { using value_type = int; };
|
||||
// iterator_traits<G> is specialized, so use its value_type.
|
||||
|
@ -111,7 +111,7 @@ static_assert( check_alias<G, std::iterator_traits<G>::value_type> );
|
|||
|
||||
struct H { };
|
||||
template<>
|
||||
struct std::readable_traits<H> { using value_type = H; };
|
||||
struct std::indirectly_readable_traits<H> { using value_type = H; };
|
||||
template<>
|
||||
struct std::iterator_traits<H>
|
||||
{
|
||||
|
@ -128,8 +128,8 @@ struct I
|
|||
using value_type = I;
|
||||
};
|
||||
// iterator_traits<I> is not specialized, and no standard specialization
|
||||
// matches, so use readable_traits.
|
||||
static_assert( check_alias<I, std::readable_traits<I>::value_type> );
|
||||
// matches, so use indirectly_readable_traits.
|
||||
static_assert( check_alias<I, std::indirectly_readable_traits<I>::value_type> );
|
||||
|
||||
struct J
|
||||
{
|
||||
|
|
|
@ -29,9 +29,11 @@ static_assert(std::same_as<decltype(*std::declval<const PI<int*>&>()), int&>);
|
|||
struct X
|
||||
{
|
||||
using value_type = char*;
|
||||
char* const& operator*() &;
|
||||
char* const& operator*() const;
|
||||
};
|
||||
static_assert( std::readable<X> );
|
||||
static_assert( std::indirectly_readable<X> );
|
||||
static_assert( std::indirectly_readable<X&> );
|
||||
static_assert( std::indirectly_readable<const X> );
|
||||
static_assert(std::same_as<PI<X>::value_type, char*>);
|
||||
static_assert(std::same_as<decltype(*std::declval<PI<X>&>()), char* const&>);
|
||||
|
||||
|
|
Loading…
Reference in New Issue