| Eric Fiselier | 257fd69 | 2016-05-07 01:04:55 +0000 | [diff] [blame] | 1 | // -*- C++ -*- |
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // The LLVM Compiler Infrastructure |
| 5 | // |
| 6 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 7 | // Source Licenses. See LICENSE.TXT for details. |
| 8 | // |
| 9 | //===----------------------------------------------------------------------===// |
| 10 | |
| 11 | #ifndef _LIBCPP_EXPERIMENTAL___MEMORY |
| 12 | #define _LIBCPP_EXPERIMENTAL___MEMORY |
| 13 | |
| 14 | #include <experimental/__config> |
| 15 | #include <experimental/utility> // for erased_type |
| 16 | #include <__functional_base> |
| 17 | #include <type_traits> |
| 18 | |
| 19 | _LIBCPP_BEGIN_NAMESPACE_LFTS |
| 20 | |
| 21 | template < |
| 22 | class _Tp, class _Alloc |
| 23 | , bool = uses_allocator<_Tp, _Alloc>::value |
| 24 | , bool = __has_allocator_type<_Tp>::value |
| 25 | > |
| 26 | struct __lfts_uses_allocator : public false_type {}; |
| 27 | |
| 28 | template <class _Tp, class _Alloc> |
| 29 | struct __lfts_uses_allocator<_Tp, _Alloc, false, false> : public false_type {}; |
| 30 | |
| 31 | template <class _Tp, class _Alloc, bool HasAlloc> |
| 32 | struct __lfts_uses_allocator<_Tp, _Alloc, true, HasAlloc> : public true_type {}; |
| 33 | |
| 34 | template <class _Tp, class _Alloc> |
| 35 | struct __lfts_uses_allocator<_Tp, _Alloc, false, true> |
| 36 | : public integral_constant<bool |
| 37 | , is_convertible<_Alloc, typename _Tp::allocator_type>::value |
| 38 | || is_same<erased_type, typename _Tp::allocator_type>::value |
| 39 | > |
| 40 | {}; |
| 41 | |
| 42 | template <bool _UsesAlloc, class _Tp, class _Alloc, class ..._Args> |
| 43 | struct __lfts_uses_alloc_ctor_imp |
| 44 | { |
| 45 | static const int value = 0; |
| 46 | }; |
| 47 | |
| 48 | template <class _Tp, class _Alloc, class ..._Args> |
| 49 | struct __lfts_uses_alloc_ctor_imp<true, _Tp, _Alloc, _Args...> |
| 50 | { |
| 51 | static const bool __ic_first |
| 52 | = is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value; |
| 53 | |
| 54 | static const bool __ic_second = |
| 55 | conditional< |
| 56 | __ic_first, |
| 57 | false_type, |
| 58 | is_constructible<_Tp, _Args..., _Alloc> |
| 59 | >::type::value; |
| 60 | |
| 61 | static_assert(__ic_first || __ic_second, |
| 62 | "Request for uses allocator construction is ill-formed"); |
| 63 | |
| 64 | static const int value = __ic_first ? 1 : 2; |
| 65 | }; |
| 66 | |
| 67 | template <class _Tp, class _Alloc, class ..._Args> |
| 68 | struct __lfts_uses_alloc_ctor |
| 69 | : integral_constant<int, |
| 70 | __lfts_uses_alloc_ctor_imp< |
| 71 | __lfts_uses_allocator<_Tp, _Alloc>::value |
| 72 | , _Tp, _Alloc, _Args... |
| 73 | >::value |
| 74 | > |
| 75 | {}; |
| 76 | |
| 77 | template <class _Tp, class _Alloc, class ..._Args> |
| 78 | inline _LIBCPP_INLINE_VISIBILITY |
| 79 | void __lfts_user_alloc_construct( |
| 80 | _Tp * __store, const _Alloc & __a, _Args &&... __args) |
| 81 | { |
| 82 | _VSTD::__user_alloc_construct_impl( |
| 83 | typename __lfts_uses_alloc_ctor<_Tp, _Alloc, _Args...>::type() |
| 84 | , __store, __a, _VSTD::forward<_Args>(__args)... |
| 85 | ); |
| 86 | } |
| 87 | |
| 88 | _LIBCPP_END_NAMESPACE_LFTS |
| 89 | |
| 90 | #endif /* _LIBCPP_EXPERIMENTAL___MEMORY */ |