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> 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 42 public: 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