| //===----------------------------------------------------------------------===// |
| // |
| // 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___TYPE_IS_ALLOCATOR_H |
| #define _LIBCPP___TYPE_IS_ALLOCATOR_H |
| |
| #include <__config> |
| #include <__type_traits/integral_constant.h> |
| #include <__type_traits/void_t.h> |
| #include <__utility/declval.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template<typename _Alloc, typename = void, typename = void> |
| struct __is_allocator : false_type {}; |
| |
| template<typename _Alloc> |
| struct __is_allocator<_Alloc, |
| __void_t<typename _Alloc::value_type>, |
| __void_t<decltype(declval<_Alloc&>().allocate(size_t(0)))> |
| > |
| : true_type {}; |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_IS_ALLOCATOR_H |
