6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
//===-- SaveAndRestore.h - Utility -------------------------------*- 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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/// \file
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/// This file provides utility classes that use RAII to save and restore
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/// values.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_SAVEANDRESTORE_H
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#define LLVM_SUPPORT_SAVEANDRESTORE_H
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#include <utility>
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namespace llvm {
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/// A utility class that uses RAII to save and restore the value of a variable.
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template <typename T> struct SaveAndRestore {
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SaveAndRestore(T &X) : X(X), OldValue(X) {}
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SaveAndRestore(T &X, const T &NewValue) : X(X), OldValue(X) { X = NewValue; }
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SaveAndRestore(T &X, T &&NewValue) : X(X), OldValue(std::move(X)) {
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X = std::move(NewValue);
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}
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~SaveAndRestore() { X = std::move(OldValue); }
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const T &get() { return OldValue; }
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private:
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T &X;
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T OldValue;
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};
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// User-defined CTAD guides.
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template <typename T> SaveAndRestore(T &) -> SaveAndRestore<T>;
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template <typename T> SaveAndRestore(T &, const T &) -> SaveAndRestore<T>;
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template <typename T> SaveAndRestore(T &, T &&) -> SaveAndRestore<T>;
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} // namespace llvm
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#endif
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