37 lines
1.0 KiB
C++
37 lines
1.0 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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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) {
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X = NewValue;
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}
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~SaveAndRestore() { X = OldValue; }
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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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} // namespace llvm
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#endif
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