From fdb97a3e9cf598d7fe8fee01fd5fce798f837879 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Mon, 4 Feb 2019 02:15:20 -0600
Subject: [PATCH] Add class and macro to save and auto-restore a variable
---
Marlin/src/core/utility.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/Marlin/src/core/utility.h b/Marlin/src/core/utility.h
index b59500f0ca..b8e2ffa38f 100644
--- a/Marlin/src/core/utility.h
+++ b/Marlin/src/core/utility.h
@@ -121,3 +121,16 @@ inline void serial_delay(const millis_t ms) {
#endif
void print_bin(const uint16_t val);
+
+template<typename T>
+class restorer {
+ T& ref_;
+ T val_;
+public:
+ restorer(T& perm) : ref_(perm), val_(perm) {}
+ ~restorer() { restore(); }
+ inline void restore() { ref_ = val_; }
+};
+
+#define REMEMBER(X) restorer<typeof(X)> X##_restorer(X)
+#define RESTORE(X) X##_restorer.restore()
--
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