1//===----------------------------------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#ifndef _LIBCPP___TYPE_IS_ALLOCATOR_H 10#define _LIBCPP___TYPE_IS_ALLOCATOR_H 11 12#include <__config> 13#include <__type_traits/integral_constant.h> 14#include <__type_traits/void_t.h> 15#include <__utility/declval.h> 16#include <cstddef> 17 18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19# pragma GCC system_header 20#endif 21 22_LIBCPP_BEGIN_NAMESPACE_STD 23 24template<typename _Alloc, typename = void, typename = void> 25struct __is_allocator : false_type {}; 26 27template<typename _Alloc> 28struct __is_allocator<_Alloc, 29 __void_t<typename _Alloc::value_type>, 30 __void_t<decltype(std::declval<_Alloc&>().allocate(size_t(0)))> 31 > 32 : true_type {}; 33 34_LIBCPP_END_NAMESPACE_STD 35 36#endif // _LIBCPP___TYPE_IS_ALLOCATOR_H 37