1 files changed, 36 insertions, 0 deletions
diff --git a/clang-r353983e/include/llvm/Support/SaveAndRestore.h b/clang-r353983e/include/llvm/Support/SaveAndRestore.h
new file mode 100644
index 00000000..3c0333b7
--- /dev/null
+++ b/clang-r353983e/include/llvm/Support/SaveAndRestore.h
@@ -0,0 +1,36 @@
+//===-- SaveAndRestore.h - Utility  -------------------------------*- 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 provides utility classes that use RAII to save and restore
+/// values.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_SAVEANDRESTORE_H
+#define LLVM_SUPPORT_SAVEANDRESTORE_H
+
+namespace llvm {
+
+/// 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), OldValue(X) {}
+  SaveAndRestore(T &X, const T &NewValue) : X(X), OldValue(X) {
+    X = NewValue;
+  }
+  ~SaveAndRestore() { X = OldValue; }
+  T get() { return OldValue; }
+
+private:
+  T &X;
+  T OldValue;
+};
+
+} // namespace llvm
+
+#endif