Move variable files to to variables folder

lib/variables/variable-number.hpp

@@ -0,0 +1,43 @@
+#pragma once
+#include "variable.hpp"
+
+#include <obs.hpp>
+
+namespace advss {
+
+template<typename T> class NumberVariable {
+public:
+	NumberVariable() = default;
+	NumberVariable(T);
+
+	void Save(obs_data_t *obj, const char *name) const;
+	void Load(obs_data_t *obj, const char *name);
+
+	T GetValue() const;
+	T GetFixedValue() const { return _value; }
+	bool HasValidValue() const;
+	void SetValue(T val) { _value = val; }
+	void SetValue(const std::weak_ptr<Variable> &var) { _variable = var; }
+	operator T() const;
+
+	enum class Type { FIXED_VALUE, VARIABLE };
+	Type GetType() const { return _type; }
+	bool IsFixedType() const { return _type == Type::FIXED_VALUE; }
+	std::weak_ptr<Variable> GetVariable() const { return _variable; }
+
+private:
+	Type _type = Type::FIXED_VALUE;
+	T _value = {};
+	std::weak_ptr<Variable> _variable;
+
+	friend class GenericVaraiableSpinbox;
+	friend class VariableSpinBox;
+	friend class VariableDoubleSpinBox;
+};
+
+#include "variable-number.tpp"
+
+using IntVariable = NumberVariable<int>;
+using DoubleVariable = NumberVariable<double>;
+
+} // namespace advss