1 files changed, 35 insertions, 0 deletions
diff --git a/libraries/logic/DefaultVariable.h b/libraries/logic/DefaultVariable.h
new file mode 100644
index 00000000..38d7ecc2
--- /dev/null
+++ b/libraries/logic/DefaultVariable.h
@@ -0,0 +1,35 @@
+#pragma once
+
+template <typename T>
+class DefaultVariable
+{
+public:
+	DefaultVariable(const T & value)
+	{
+		defaultValue = value;
+	}
+	DefaultVariable<T> & operator =(const T & value)
+	{
+		currentValue = value;
+		is_default = currentValue == defaultValue;
+		is_explicit = true;
+		return *this;
+	}
+	operator const T &() const
+	{
+		return is_default ? defaultValue : currentValue;
+	}
+	bool isDefault() const
+	{
+		return is_default;
+	}
+	bool isExplicit() const
+	{
+		return is_explicit;
+	}
+private:
+	T currentValue;
+	T defaultValue;
+	bool is_default = true;
+	bool is_explicit = false;
+};