value.h

#ifndef VALUE_H
#define VALUE_H

class Value {
public:
	enum Type {
		NUL, NUM, STRING, BOOL
	};
	Value(double d) : val{ d }, valType{ Type::NUM }
	{ }
	Value(std::string s) : val{ s }, valType{ Type::STRING }
	{ }
	Value(bool b) : val{ b }, valType{ Type::BOOL }
	{ }
	Value() : val{ std::monostate{} }, valType{ Type::NUL }
	{ }

	auto getVal() {
		return val;
	}

	Type getType() {
		return valType;
	}

	friend std::ostream& operator<<(std::ostream& out, Value val) {
		switch (val.getType()) {
		case Type::NUM:
			out << std::get<double>(val.getVal());
			break;
		case Type::STRING:
			out << std::get<std::string>(val.getVal());
			break;
		case Type::NUL:
			out << "NULL";
			break;
		case Type::BOOL:
			out << std::get<bool>(val.getVal());
			break;
		}
		return out;
	}
private:
	std::variant<std::monostate, double, std::string, bool> val;
	Type valType;
};

#endif