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