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___MEMORY_DESTRUCT_N_H
10#define _LIBCPP___MEMORY_DESTRUCT_N_H
11
12#include <__config>
13#include <__type_traits/integral_constant.h>
14#include <__type_traits/is_trivially_destructible.h>
15#include <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
23struct __destruct_n
24{
25private:
26    size_t __size_;
27
28    template <class _Tp>
29    _LIBCPP_INLINE_VISIBILITY void __process(_Tp* __p, false_type) _NOEXCEPT
30        {for (size_t __i = 0; __i < __size_; ++__i, ++__p) __p->~_Tp();}
31
32    template <class _Tp>
33    _LIBCPP_INLINE_VISIBILITY void __process(_Tp*, true_type) _NOEXCEPT
34        {}
35
36    _LIBCPP_INLINE_VISIBILITY void __incr(false_type) _NOEXCEPT
37        {++__size_;}
38    _LIBCPP_INLINE_VISIBILITY void __incr(true_type) _NOEXCEPT
39        {}
40
41    _LIBCPP_INLINE_VISIBILITY void __set(size_t __s, false_type) _NOEXCEPT
42        {__size_ = __s;}
43    _LIBCPP_INLINE_VISIBILITY void __set(size_t, true_type) _NOEXCEPT
44        {}
45public:
46    _LIBCPP_INLINE_VISIBILITY explicit __destruct_n(size_t __s) _NOEXCEPT
47        : __size_(__s) {}
48
49    template <class _Tp>
50    _LIBCPP_INLINE_VISIBILITY void __incr() _NOEXCEPT
51        {__incr(integral_constant<bool, is_trivially_destructible<_Tp>::value>());}
52
53    template <class _Tp>
54    _LIBCPP_INLINE_VISIBILITY void __set(size_t __s, _Tp*) _NOEXCEPT
55        {__set(__s, integral_constant<bool, is_trivially_destructible<_Tp>::value>());}
56
57    template <class _Tp>
58    _LIBCPP_INLINE_VISIBILITY void operator()(_Tp* __p) _NOEXCEPT
59        {__process(__p, integral_constant<bool, is_trivially_destructible<_Tp>::value>());}
60};
61
62_LIBCPP_END_NAMESPACE_STD
63
64#endif // _LIBCPP___MEMORY_DESTRUCT_N_H
65