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Add class and macro to save and auto-restore a variable

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This commit is contained in:
Scott Lahteine 2019-02-04 02:15:20 -06:00
parent 433518de74
commit fdb97a3e9c
1 changed files with 13 additions and 0 deletions
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13
Marlin/src/core/utility.h
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@ -121,3 +121,16 @@ inline void serial_delay(const millis_t ms) {
#endif #endif
void print_bin(const uint16_t val); 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()