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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___CXX03___MEMORY_USES_ALLOCATOR_H |
| 11 | #define _LIBCPP___CXX03___MEMORY_USES_ALLOCATOR_H |
| 12 | |
| 13 | #include <__cxx03/__config> |
| 14 | #include <__cxx03/__type_traits/is_convertible.h> |
| 15 | #include <__cxx03/cstddef> |
| 16 | |
| 17 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 18 | # pragma GCC system_header |
| 19 | #endif |
| 20 | |
| 21 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 22 | |
| 23 | template <class _Tp> |
| 24 | struct __has_allocator_type { |
| 25 | private: |
| 26 | template <class _Up> |
| 27 | static false_type __test(...); |
| 28 | template <class _Up> |
| 29 | static true_type __test(typename _Up::allocator_type* = 0); |
| 30 | |
| 31 | public: |
| 32 | static const bool value = decltype(__test<_Tp>(0))::value; |
| 33 | }; |
| 34 | |
| 35 | template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value> |
| 36 | struct __uses_allocator : public integral_constant<bool, is_convertible<_Alloc, typename _Tp::allocator_type>::value> { |
| 37 | }; |
| 38 | |
| 39 | template <class _Tp, class _Alloc> |
| 40 | struct __uses_allocator<_Tp, _Alloc, false> : public false_type {}; |
| 41 | |
| 42 | template <class _Tp, class _Alloc> |
| 43 | struct _LIBCPP_TEMPLATE_VIS uses_allocator : public __uses_allocator<_Tp, _Alloc> {}; |
| 44 | |
| 45 | _LIBCPP_END_NAMESPACE_STD |
| 46 | |
| 47 | #endif // _LIBCPP___CXX03___MEMORY_USES_ALLOCATOR_H |
| 48 |
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