variadic_template.cpp
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	#include <iostream>

	template <typename T> T adder(T v) { return v; }

	template <typename T, typename... Args>
	// template ...Args is a variadic template
	T adder(T first, Args... args) {
	return first + adder(args...);
	}

	int main() {
	std::cout << adder(1, 2, 3, 4);
	std::cout << adder(1., 2, 3., 4);
	std::cout << adder(std::string("a"), std::string("b"));
	std::cout << std::endl;
	}