1 files changed, 44 insertions, 0 deletions
diff --git a/SQLiteStudio3/coreSQLiteStudio/common/valuelocker.h b/SQLiteStudio3/coreSQLiteStudio/common/valuelocker.h
new file mode 100644
index 0000000..a757506
--- /dev/null
+++ b/SQLiteStudio3/coreSQLiteStudio/common/valuelocker.h
@@ -0,0 +1,44 @@
+#ifndef VALUELOCKER_H
+#define VALUELOCKER_H
+
+/**
+ * ValueLocker is similar to QMutexLocker, but it's not intended for multithreaded locks.
+ * It's rather for event loop locking.
+ * It can be created as local scope variable with a pointer to member variable.
+ * It will set "unlockedValue" to that variable once the locker is destroyed (goes out of scope).
+ * Usually the variable used will be of boolean type, but it can be virtually any other type.
+ * You can also provide initial value for locked state. Otherwise you will need to set the locked
+ * by yourself before the lock is created.
+ */
+template <class T>
+class ValueLocker {
+    public:
+        ValueLocker(T* valueToLock, const T& lockedValue, const T& unlockedValue);
+        ValueLocker(T* valueToLock, const T& unlockedValue);
+        ~ValueLocker();
+
+    private:
+        T* valueToLock;
+        T unlockedValue;
+};
+
+template<class T>
+ValueLocker<T>::ValueLocker(T *valueToLock, const T &lockedValue, const T &unlockedValue) :
+    ValueLocker(valueToLock, unlockedValue)
+{
+    *valueToLock = lockedValue;
+}
+
+template<class T>
+ValueLocker<T>::ValueLocker(T *valueToLock, const T &unlockedValue) :
+    valueToLock(valueToLock), unlockedValue(unlockedValue)
+{
+}
+
+template<class T>
+ValueLocker<T>::~ValueLocker()
+{
+    *valueToLock = unlockedValue;
+}
+
+#endif // VALUELOCKER_H