recursive map of string

recursive-string-map.cpp

class Cfg {
public:
	Cfg(std::initializer_list<std::pair<std::string, Cfg>> init) {
		for (auto&& it: init) {
			children_.insert(it);
		}
	}
	Cfg(std::initializer_list<std::pair<std::string, std::string>> init) {
		for (auto&& it: init) {
			children_.insert(it);
		}
	}
	Cfg(std::string data) : data_{data} {
	}
	const Cfg& operator[](const std::string& key) const {
		return children_.at(key);
	}
	operator std::string() const {
		return data_;
	}

private:
	std::string data_;
	std::map<std::string, Cfg> children_;
};

TEST(DraftTest, Draft1) {
	Cfg cfg{"one"};
	ASSERT_EQ("one", static_cast<std::string>(cfg));
}

TEST(DraftTest, Draft2) {
	Cfg cfg = {{"foo", "one"}, {"bar", "two"}};
	ASSERT_EQ("one", static_cast<std::string>(cfg["foo"]));
}

TEST(DraftTest, Draft3) {
	Cfg cfg = {
		{"foo", {
			{"bar", "three"}
		}},
	};
	ASSERT_EQ("three", static_cast<std::string>(cfg["foo"]["bar"]));
}