66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
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//===- 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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