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73e8e1ba8d
While it's not necessary to qualify calls to `declval` it makes error messages very crypric if the declaration isn't reachable anymore
For example:
```
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__chrono/duration.h:53:66: error: no type named 'type' in 'std::common_type<long, long>'
typedef chrono::duration<typename common_type<_Rep1, _Rep2>::type,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__type_traits/common_type.h:107:14: note: in instantiation of template class 'std::common_type<std::chrono::duration<long, std::ratio<3600, 1>>, std::chrono::duration<long, std::ratio<3600, 1>>>' requested here
: public common_type<_Tp, _Tp> {};
^
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__chrono/duration.h:279:58: note: in instantiation of template class 'std::common_type<std::chrono::duration<long, std::ratio<3600, 1>>>' requested here
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR typename common_type<duration>::type operator+() const {return typename common_type<duration>::type(*this);}
^
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__chrono/duration.h:308:54: note: in instantiation of template class 'std::chrono::duration<long, std::ratio<3600, 1>>' requested here
typedef duration< int, ratio_multiply<ratio<24>, hours::period>> days;
^
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__chrono/duration.h:280:81: error: no type named 'type' in 'std::common_type<std::chrono::duration<long, std::ratio<3600, 1>>>'
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR typename common_type<duration>::type operator-() const {return typename common_type<duration>::type(-__rep_);}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__chrono/duration.h:308:54: note: in instantiation of template class 'std::chrono::duration<long, std::ratio<3600, 1>>' requested here
typedef duration< int, ratio_multiply<ratio<24>, hours::period>> days;
^
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__chrono/duration.h:53:66: error: no type named 'type' in 'std::common_type<int, int>'
typedef chrono::duration<typename common_type<_Rep1, _Rep2>::type,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__type_traits/common_type.h:107:14: note: in instantiation of template class 'std::common_type<std::chrono::duration<int, std::ratio<86400, 1>>, std::chrono::duration<int, std::ratio<86400, 1>>>' requested here
: public common_type<_Tp, _Tp> {};
^
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__chrono/duration.h:279:58: note: in instantiation of template class 'std::common_type<std::chrono::duration<int, std::ratio<86400, 1>>>' requested here
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR typename common_type<duration>::type operator+() const {return typename common_type<duration>::type(*this);}
^
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__chrono/duration.h:309:55: note: in instantiation of template class 'std::chrono::duration<int, std::ratio<86400, 1>>' requested here
typedef duration< int, ratio_multiply<ratio<7>, days::period>> weeks;
^
19 similar errors omitted
```
changes with qualification added to:
```
While building module 'std' imported from /home/nikolask/llvm-projects/libcxx/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/common_type.pass.cpp:13:
In file included from <module-includes>:17:
In file included from /home/nikolask/llvm-projects/libcxx/build/include/c++/v1/math.h:309:
In file included from /home/nikolask/llvm-projects/libcxx/build/include/c++/v1/limits:107:
In file included from /home/nikolask/llvm-projects/libcxx/build/include/c++/v1/type_traits:432:
In file included from /home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__type_traits/common_reference.h:13:
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__type_traits/common_type.h:28:43: error: declaration of 'declval' must be imported from module 'std.utility.__utility.declval' before it is required
using __cond_type = decltype(false ? std::declval<_Tp>() : std::declval<_Up>());
^
/home/nikolask/llvm-projects/libcxx/build/include/c++/v1/__utility/declval.h:30:34: note: declaration here is not visible
decltype(std::__declval<_Tp>(0)) declval() _NOEXCEPT;
^
/home/nikolask/llvm-projects/libcxx/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/common_type.pass.cpp:13:10: fatal error: could not build module 'std'
#include <functional>
~~~~~~~~^
2 errors generated.
```
Reviewed By: ldionne, Mordante, #libc
Spies: libcxx-commits
Differential Revision: https://reviews.llvm.org/D130854
148 lines
4.4 KiB
C++
148 lines
4.4 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___RANGES_CONCEPTS_H
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#define _LIBCPP___RANGES_CONCEPTS_H
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#include <__concepts/constructible.h>
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#include <__concepts/movable.h>
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#include <__concepts/same_as.h>
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/incrementable_traits.h>
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#include <__iterator/iter_move.h>
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#include <__iterator/iterator_traits.h>
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#include <__iterator/readable_traits.h>
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#include <__ranges/access.h>
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#include <__ranges/data.h>
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#include <__ranges/enable_borrowed_range.h>
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#include <__ranges/enable_view.h>
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#include <__ranges/size.h>
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#include <__type_traits/add_pointer.h>
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#include <__type_traits/is_reference.h>
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#include <__type_traits/remove_cvref.h>
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#include <__type_traits/remove_reference.h>
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#include <__utility/declval.h>
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#include <initializer_list>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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namespace ranges {
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// [range.range]
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template <class _Tp>
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concept range = requires(_Tp& __t) {
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ranges::begin(__t); // sometimes equality-preserving
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ranges::end(__t);
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};
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template <class _Tp>
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concept input_range = range<_Tp> && input_iterator<iterator_t<_Tp>>;
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template<class _Range>
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concept borrowed_range = range<_Range> &&
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(is_lvalue_reference_v<_Range> || enable_borrowed_range<remove_cvref_t<_Range>>);
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// `iterator_t` defined in <__ranges/access.h>
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template <range _Rp>
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using sentinel_t = decltype(ranges::end(std::declval<_Rp&>()));
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template <range _Rp>
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using range_difference_t = iter_difference_t<iterator_t<_Rp>>;
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template <range _Rp>
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using range_value_t = iter_value_t<iterator_t<_Rp>>;
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template <range _Rp>
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using range_reference_t = iter_reference_t<iterator_t<_Rp>>;
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template <range _Rp>
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using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<_Rp>>;
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// [range.sized]
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template <class _Tp>
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concept sized_range = range<_Tp> && requires(_Tp& __t) { ranges::size(__t); };
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template<sized_range _Rp>
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using range_size_t = decltype(ranges::size(std::declval<_Rp&>()));
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// `disable_sized_range` defined in `<__ranges/size.h>`
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// [range.view], views
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// `enable_view` defined in <__ranges/enable_view.h>
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// `view_base` defined in <__ranges/enable_view.h>
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template <class _Tp>
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concept view =
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range<_Tp> &&
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movable<_Tp> &&
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enable_view<_Tp>;
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template <class _Range>
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concept __simple_view =
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view<_Range> && range<const _Range> &&
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same_as<iterator_t<_Range>, iterator_t<const _Range>> &&
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same_as<sentinel_t<_Range>, sentinel_t<const _Range>>;
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// [range.refinements], other range refinements
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template <class _Rp, class _Tp>
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concept output_range = range<_Rp> && output_iterator<iterator_t<_Rp>, _Tp>;
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template <class _Tp>
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concept forward_range = input_range<_Tp> && forward_iterator<iterator_t<_Tp>>;
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template <class _Tp>
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concept bidirectional_range = forward_range<_Tp> && bidirectional_iterator<iterator_t<_Tp>>;
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template <class _Tp>
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concept random_access_range =
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bidirectional_range<_Tp> && random_access_iterator<iterator_t<_Tp>>;
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template<class _Tp>
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concept contiguous_range =
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random_access_range<_Tp> &&
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contiguous_iterator<iterator_t<_Tp>> &&
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requires(_Tp& __t) {
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{ ranges::data(__t) } -> same_as<add_pointer_t<range_reference_t<_Tp>>>;
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};
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template <class _Tp>
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concept common_range = range<_Tp> && same_as<iterator_t<_Tp>, sentinel_t<_Tp>>;
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template <class _Tp>
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inline constexpr bool __is_std_initializer_list = false;
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template <class _Ep>
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inline constexpr bool __is_std_initializer_list<initializer_list<_Ep>> = true;
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template <class _Tp>
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concept viewable_range =
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range<_Tp> &&
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((view<remove_cvref_t<_Tp>> && constructible_from<remove_cvref_t<_Tp>, _Tp>) ||
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(!view<remove_cvref_t<_Tp>> &&
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(is_lvalue_reference_v<_Tp> ||
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(movable<remove_reference_t<_Tp>> && !__is_std_initializer_list<remove_cvref_t<_Tp>>))));
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} // namespace ranges
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#endif // _LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___RANGES_CONCEPTS_H
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