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d6832a611a
Many headers include `<cstddef>` just for size_t, and pulling in additional content (e.g. the traits used for std::byte) is unnecessary. To solve this problem, this patch splits up `<cstddef>` into subcomponents so that headers can include only the parts that they actually require. This has the added benefit of making the modules build a lot stricter with respect to IWYU, and also providing a canonical location where we define `std::size_t` and friends (which were previously defined in multiple headers like `<cstddef>` and `<ctime>`). After this patch, there's still many places in the codebase where we include `<cstddef>` when `<__cstddef/size_t.h>` would be sufficient. This patch focuses on removing `<cstddef>` includes from __type_traits to make these headers non-circular with `<cstddef>`. Additional refactorings can be tackled separately.
54 lines
1.6 KiB
C++
54 lines
1.6 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___MEMORY_USES_ALLOCATOR_H
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#define _LIBCPP___MEMORY_USES_ALLOCATOR_H
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#include <__config>
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#include <__type_traits/integral_constant.h>
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#include <__type_traits/is_convertible.h>
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#include <cstddef>
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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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template <class _Tp>
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struct __has_allocator_type {
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private:
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template <class _Up>
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static false_type __test(...);
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template <class _Up>
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static true_type __test(typename _Up::allocator_type* = 0);
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public:
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static const bool value = decltype(__test<_Tp>(0))::value;
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};
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template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value>
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struct __uses_allocator : public integral_constant<bool, is_convertible<_Alloc, typename _Tp::allocator_type>::value> {
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};
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template <class _Tp, class _Alloc>
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struct __uses_allocator<_Tp, _Alloc, false> : public false_type {};
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template <class _Tp, class _Alloc>
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struct _LIBCPP_TEMPLATE_VIS uses_allocator : public __uses_allocator<_Tp, _Alloc> {};
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#if _LIBCPP_STD_VER >= 17
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template <class _Tp, class _Alloc>
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inline constexpr bool uses_allocator_v = uses_allocator<_Tp, _Alloc>::value;
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_USES_ALLOCATOR_H
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