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 
23 struct __destruct_n {
24 private:
25   size_t __size_;
26 
27   template <class _Tp>
__process__destruct_n28   _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>
__process__destruct_n34   _LIBCPP_HIDE_FROM_ABI void __process(_Tp*, true_type) _NOEXCEPT {}
35 
__incr__destruct_n36   _LIBCPP_HIDE_FROM_ABI void __incr(false_type) _NOEXCEPT { ++__size_; }
__incr__destruct_n37   _LIBCPP_HIDE_FROM_ABI void __incr(true_type) _NOEXCEPT {}
38 
__set__destruct_n39   _LIBCPP_HIDE_FROM_ABI void __set(size_t __s, false_type) _NOEXCEPT { __size_ = __s; }
__set__destruct_n40   _LIBCPP_HIDE_FROM_ABI void __set(size_t, true_type) _NOEXCEPT {}
41 
42 public:
__destruct_n__destruct_n43   _LIBCPP_HIDE_FROM_ABI explicit __destruct_n(size_t __s) _NOEXCEPT : __size_(__s) {}
44 
45   template <class _Tp>
__incr__destruct_n46   _LIBCPP_HIDE_FROM_ABI void __incr() _NOEXCEPT {
47     __incr(integral_constant<bool, is_trivially_destructible<_Tp>::value>());
48   }
49 
50   template <class _Tp>
__set__destruct_n51   _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>
operator__destruct_n56   _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