template-function-match.cpp

#include <chrono>
#include <random>
#include <iostream>

template<typename U> void match(const U&) {}
template<typename U, typename Expr> void match(const U&, const Expr& expr) { expr(); }
template<typename U, typename Expr, typename... Args>
void match(const U& u, const U& cond, Expr expr, const Args&... args) {
	return u == cond ? expr() : match(u, args...);
}

int main() {
	std::mt19937 engine(std::chrono::system_clock::now().time_since_epoch().count());
	std::uniform_int_distribution<int> distribution{0, 9};

	const auto value(distribution(engine));
	std::cout << value << std::endl;
	match(value,
		   0, [] { std::cout << "one\n"; },
		   1, [] { std::cout << "two\n"; },
		   [] { std::cout << "some other number\n"; });
}