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 {
25 private:
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         {}
45 public:
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