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//===- llvm/ADT/ScopeExit.h - Execute code at scope exit --------*- 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file defines the make_scope_exit function, which executes user-defined
/// cleanup logic at scope exit.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_SCOPEEXIT_H
#define LLVM_ADT_SCOPEEXIT_H
#include "llvm/Support/Compiler.h"
#include <type_traits>
#include <utility>
namespace llvm {
namespace detail {
template <typename Callable> class scope_exit {
Callable ExitFunction;
bool Engaged = true; // False once moved-from or release()d.
public:
template <typename Fp>
explicit scope_exit(Fp &&F) : ExitFunction(std::forward<Fp>(F)) {}
scope_exit(scope_exit &&Rhs)
: ExitFunction(std::move(Rhs.ExitFunction)), Engaged(Rhs.Engaged) {
Rhs.release();
}
scope_exit(const scope_exit &) = delete;
scope_exit &operator=(scope_exit &&) = delete;
scope_exit &operator=(const scope_exit &) = delete;
void release() { Engaged = false; }
~scope_exit() {
if (Engaged)
ExitFunction();
}
};
} // end namespace detail
// Keeps the callable object that is passed in, and execute it at the
// destruction of the returned object (usually at the scope exit where the
// returned object is kept).
//
// Interface is specified by p0052r2.
template <typename Callable>
[[nodiscard]] detail::scope_exit<std::decay_t<Callable>>
make_scope_exit(Callable &&F) {
return detail::scope_exit<std::decay_t<Callable>>(std::forward<Callable>(F));
}
} // end namespace llvm
#endif
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