1*700637cbSDimitry Andric // -*- C++ -*- 2*700637cbSDimitry Andric //===----------------------------------------------------------------------===// 3*700637cbSDimitry Andric // 4*700637cbSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5*700637cbSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6*700637cbSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7*700637cbSDimitry Andric // 8*700637cbSDimitry Andric //===----------------------------------------------------------------------===// 9*700637cbSDimitry Andric 10*700637cbSDimitry Andric #ifndef _LIBCPP___UTILITY_SCOPE_GUARD_H 11*700637cbSDimitry Andric #define _LIBCPP___UTILITY_SCOPE_GUARD_H 12*700637cbSDimitry Andric 13*700637cbSDimitry Andric #include <__config> 14*700637cbSDimitry Andric #include <__utility/move.h> 15*700637cbSDimitry Andric 16*700637cbSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17*700637cbSDimitry Andric # pragma GCC system_header 18*700637cbSDimitry Andric #endif 19*700637cbSDimitry Andric 20*700637cbSDimitry Andric _LIBCPP_PUSH_MACROS 21*700637cbSDimitry Andric #include <__undef_macros> 22*700637cbSDimitry Andric 23*700637cbSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 24*700637cbSDimitry Andric 25*700637cbSDimitry Andric template <class _Func> 26*700637cbSDimitry Andric class __scope_guard { 27*700637cbSDimitry Andric _Func __func_; 28*700637cbSDimitry Andric 29*700637cbSDimitry Andric public: __scope_guard(_Func __func)30*700637cbSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __scope_guard(_Func __func) : __func_(std::move(__func)) {} ~__scope_guard()31*700637cbSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__scope_guard() { __func_(); } 32*700637cbSDimitry Andric 33*700637cbSDimitry Andric __scope_guard(const __scope_guard&) = delete; 34*700637cbSDimitry Andric __scope_guard& operator=(const __scope_guard&) = delete; 35*700637cbSDimitry Andric __scope_guard& operator=(__scope_guard&&) = delete; 36*700637cbSDimitry Andric 37*700637cbSDimitry Andric // C++14 doesn't have mandatory RVO, so we have to provide a declaration even though no compiler will ever generate 38*700637cbSDimitry Andric // a call to the move constructor. 39*700637cbSDimitry Andric #if _LIBCPP_STD_VER <= 14 40*700637cbSDimitry Andric __scope_guard(__scope_guard&&); 41*700637cbSDimitry Andric #else 42*700637cbSDimitry Andric __scope_guard(__scope_guard&&) = delete; 43*700637cbSDimitry Andric #endif 44*700637cbSDimitry Andric }; 45*700637cbSDimitry Andric 46*700637cbSDimitry Andric template <class _Func> __make_scope_guard(_Func __func)47*700637cbSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __scope_guard<_Func> __make_scope_guard(_Func __func) { 48*700637cbSDimitry Andric return __scope_guard<_Func>(std::move(__func)); 49*700637cbSDimitry Andric } 50*700637cbSDimitry Andric 51*700637cbSDimitry Andric _LIBCPP_END_NAMESPACE_STD 52*700637cbSDimitry Andric 53*700637cbSDimitry Andric _LIBCPP_POP_MACROS 54*700637cbSDimitry Andric 55*700637cbSDimitry Andric #endif // _LIBCPP___UTILITY_SCOPE_GUARD_H 56