mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-09 10:05:41 +00:00
925c3f0871
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151828 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
//===-- SaveAndRestore.h - Utility -------------------------------*- C++ -*-=//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file provides utility classes that uses RAII to save and restore
|
|
// values.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ADT_SAVERESTORE
|
|
#define LLVM_ADT_SAVERESTORE
|
|
|
|
namespace llvm {
|
|
|
|
// SaveAndRestore - A utility class that uses RAII to save and restore
|
|
// the value of a variable.
|
|
template<typename T>
|
|
struct SaveAndRestore {
|
|
SaveAndRestore(T& x) : X(x), old_value(x) {}
|
|
SaveAndRestore(T& x, const T &new_value) : X(x), old_value(x) {
|
|
X = new_value;
|
|
}
|
|
~SaveAndRestore() { X = old_value; }
|
|
T get() { return old_value; }
|
|
private:
|
|
T& X;
|
|
T old_value;
|
|
};
|
|
|
|
// SaveOr - Similar to SaveAndRestore. Operates only on bools; the old
|
|
// value of a variable is saved, and during the dstor the old value is
|
|
// or'ed with the new value.
|
|
struct SaveOr {
|
|
SaveOr(bool& x) : X(x), old_value(x) { x = false; }
|
|
~SaveOr() { X |= old_value; }
|
|
private:
|
|
bool& X;
|
|
const bool old_value;
|
|
};
|
|
|
|
}
|
|
#endif
|