llvm-project/libcxx/include/__memory/uses_allocator.h
Louis Dionne 9783f28cbb
[libc++] Format the code base (#74334)
This patch runs clang-format on all of libcxx/include and libcxx/src, in
accordance with the RFC discussed at [1]. Follow-up patches will format
the benchmarks, the test suite and remaining parts of the code. I'm
splitting this one into its own patch so the diff is a bit easier to
review.

This patch was generated with:

   find libcxx/include libcxx/src -type f \
      | grep -v 'module.modulemap.in' \
      | grep -v 'CMakeLists.txt' \
      | grep -v 'README.txt' \
      | grep -v 'libcxx.imp' \
      | grep -v '__config_site.in' \
      | xargs clang-format -i

A Git merge driver is available in libcxx/utils/clang-format-merge-driver.sh
to help resolve merge and rebase issues across these formatting changes.

[1]: https://discourse.llvm.org/t/rfc-clang-formatting-all-of-libc-once-and-for-all
2023-12-18 14:01:33 -05:00

53 lines
1.5 KiB
C++

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___MEMORY_USES_ALLOCATOR_H
#define _LIBCPP___MEMORY_USES_ALLOCATOR_H
#include <__config>
#include <__type_traits/is_convertible.h>
#include <cstddef>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp>
struct __has_allocator_type {
private:
template <class _Up>
static false_type __test(...);
template <class _Up>
static true_type __test(typename _Up::allocator_type* = 0);
public:
static const bool value = decltype(__test<_Tp>(0))::value;
};
template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value>
struct __uses_allocator : public integral_constant<bool, is_convertible<_Alloc, typename _Tp::allocator_type>::value> {
};
template <class _Tp, class _Alloc>
struct __uses_allocator<_Tp, _Alloc, false> : public false_type {};
template <class _Tp, class _Alloc>
struct _LIBCPP_TEMPLATE_VIS uses_allocator : public __uses_allocator<_Tp, _Alloc> {};
#if _LIBCPP_STD_VER >= 17
template <class _Tp, class _Alloc>
inline constexpr bool uses_allocator_v = uses_allocator<_Tp, _Alloc>::value;
#endif
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___MEMORY_USES_ALLOCATOR_H