Warning: This file is not a C or C++ file. It does not have highlighting.
| 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___MEMORY_ALLOCATOR_ARG_T_H |
| 11 | #define _LIBCPP___MEMORY_ALLOCATOR_ARG_T_H |
| 12 | |
| 13 | #include <__config> |
| 14 | #include <__memory/uses_allocator.h> |
| 15 | #include <__type_traits/integral_constant.h> |
| 16 | #include <__type_traits/is_constructible.h> |
| 17 | #include <__type_traits/remove_cvref.h> |
| 18 | #include <__utility/forward.h> |
| 19 | |
| 20 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 21 | # pragma GCC system_header |
| 22 | #endif |
| 23 | |
| 24 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 25 | |
| 26 | struct allocator_arg_t { |
| 27 | explicit allocator_arg_t() = default; |
| 28 | }; |
| 29 | |
| 30 | #if _LIBCPP_STD_VER >= 17 |
| 31 | inline constexpr allocator_arg_t allocator_arg = allocator_arg_t(); |
| 32 | #elif !defined(_LIBCPP_CXX03_LANG) |
| 33 | constexpr allocator_arg_t allocator_arg = allocator_arg_t(); |
| 34 | #endif |
| 35 | |
| 36 | #ifndef _LIBCPP_CXX03_LANG |
| 37 | |
| 38 | // allocator construction |
| 39 | |
| 40 | template <class _Tp, class _Alloc, class... _Args> |
| 41 | struct __uses_alloc_ctor_imp { |
| 42 | using _RawAlloc _LIBCPP_NODEBUG = __remove_cvref_t<_Alloc>; |
| 43 | static const bool __ua = uses_allocator<_Tp, _RawAlloc>::value; |
| 44 | static const bool __ic = is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value; |
| 45 | static const int value = __ua ? 2 - __ic : 0; |
| 46 | }; |
| 47 | |
| 48 | template <class _Tp, class _Alloc, class... _Args> |
| 49 | struct __uses_alloc_ctor : integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value> {}; |
| 50 | |
| 51 | template <class _Tp, class _Allocator, class... _Args> |
| 52 | inline _LIBCPP_HIDE_FROM_ABI void |
| 53 | __user_alloc_construct_impl(integral_constant<int, 0>, _Tp* __storage, const _Allocator&, _Args&&... __args) { |
| 54 | new (__storage) _Tp(std::forward<_Args>(__args)...); |
| 55 | } |
| 56 | |
| 57 | // FIXME: This should have a version which takes a non-const alloc. |
| 58 | template <class _Tp, class _Allocator, class... _Args> |
| 59 | inline _LIBCPP_HIDE_FROM_ABI void |
| 60 | __user_alloc_construct_impl(integral_constant<int, 1>, _Tp* __storage, const _Allocator& __a, _Args&&... __args) { |
| 61 | new (__storage) _Tp(allocator_arg, __a, std::forward<_Args>(__args)...); |
| 62 | } |
| 63 | |
| 64 | // FIXME: This should have a version which takes a non-const alloc. |
| 65 | template <class _Tp, class _Allocator, class... _Args> |
| 66 | inline _LIBCPP_HIDE_FROM_ABI void |
| 67 | __user_alloc_construct_impl(integral_constant<int, 2>, _Tp* __storage, const _Allocator& __a, _Args&&... __args) { |
| 68 | new (__storage) _Tp(std::forward<_Args>(__args)..., __a); |
| 69 | } |
| 70 | |
| 71 | #endif // _LIBCPP_CXX03_LANG |
| 72 | |
| 73 | _LIBCPP_END_NAMESPACE_STD |
| 74 | |
| 75 | #endif // _LIBCPP___MEMORY_ALLOCATOR_ARG_T_H |
| 76 |
Warning: This file is not a C or C++ file. It does not have highlighting.