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674be02d52
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172025 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
//===-- SaveAndRestore.h - Utility -------------------------------*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides utility classes that uses 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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// SaveAndRestore - A utility class that uses RAII to save and restore
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// the value of a variable.
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template<typename T>
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struct SaveAndRestore {
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SaveAndRestore(T& x) : X(x), old_value(x) {}
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SaveAndRestore(T& x, const T &new_value) : X(x), old_value(x) {
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X = new_value;
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}
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~SaveAndRestore() { X = old_value; }
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T get() { return old_value; }
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private:
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T& X;
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T old_value;
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};
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// SaveOr - Similar to SaveAndRestore. Operates only on bools; the old
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// value of a variable is saved, and during the dstor the old value is
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// or'ed with the new value.
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struct SaveOr {
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SaveOr(bool& x) : X(x), old_value(x) { x = false; }
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~SaveOr() { X |= old_value; }
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private:
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bool& X;
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const bool old_value;
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};
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}
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#endif
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