5098b56d22
This introduces a new `__scope_guard` without any fancy features. The scope guard is used in `<string>` to simplify some of the ASan annotations (especially by making it harder to forget them where exceptions are thrown).
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___UTILITY_SCOPE_GUARD_H
|
|
#define _LIBCPP___UTILITY_SCOPE_GUARD_H
|
|
|
|
#include <__assert>
|
|
#include <__config>
|
|
#include <__utility/move.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
template <class _Func>
|
|
class __scope_guard {
|
|
_Func __func_;
|
|
bool __moved_from_;
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __scope_guard(_Func __func) : __func_(std::move(__func)) {}
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__scope_guard() { __func_(); }
|
|
|
|
__scope_guard(const __scope_guard&) = delete;
|
|
|
|
// C++17 has mandatory RVO, so we don't need the move constructor anymore to make __make_scope_guard work.
|
|
#if _LIBCPP_STD_VER <= 14
|
|
__scope_guard(__scope_guard&& __other) : __func_(__other.__func_) {
|
|
_LIBCPP_ASSERT_INTERNAL(!__other.__moved_from_, "Cannot move twice from __scope_guard");
|
|
__other.__moved_from_ = true;
|
|
}
|
|
#else
|
|
__scope_guard(__scope_guard&&) = delete;
|
|
#endif
|
|
|
|
__scope_guard& operator=(const __scope_guard&) = delete;
|
|
__scope_guard& operator=(__scope_guard&&) = delete;
|
|
};
|
|
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __scope_guard<_Func> __make_scope_guard(_Func __func) {
|
|
return __scope_guard<_Func>(std::move(__func));
|
|
}
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___UTILITY_SCOPE_GUARD_H
|