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