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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
//===- llvm/ADT/ScopeExit.h - Execute code at scope exit --------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the make_scope_exit function, which executes user-defined
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// cleanup logic at scope exit.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_SCOPE_EXIT_H
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#define LLVM_ADT_SCOPE_EXIT_H
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#include "llvm/Support/Compiler.h"
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#include <type_traits>
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#include <utility>
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namespace llvm {
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namespace detail {
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template <typename Callable> class scope_exit {
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Callable ExitFunction;
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bool Engaged = true; // False once moved-from or release()d.
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public:
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template <typename Fp>
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explicit scope_exit(Fp &&F) : ExitFunction(std::forward<Fp>(F)) {}
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scope_exit(scope_exit &&Rhs)
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: ExitFunction(std::move(Rhs.ExitFunction)), Engaged(Rhs.Engaged) {
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Rhs.release();
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}
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scope_exit(const scope_exit &) = delete;
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scope_exit &operator=(scope_exit &&) = delete;
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scope_exit &operator=(const scope_exit &) = delete;
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void release() { Engaged = false; }
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~scope_exit() {
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if (Engaged)
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ExitFunction();
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}
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};
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} // end namespace detail
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// Keeps the callable object that is passed in, and execute it at the
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// destruction of the returned object (usually at the scope exit where the
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// returned object is kept).
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//
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// Interface is specified by p0052r2.
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template <typename Callable>
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LLVM_NODISCARD detail::scope_exit<typename std::decay<Callable>::type>
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make_scope_exit(Callable &&F) {
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return detail::scope_exit<typename std::decay<Callable>::type>(
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std::forward<Callable>(F));
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}
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} // end namespace llvm
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#endif
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