C++ template for loop

template_loop.cpp

#include <iostream>
using namespace std;
 
template<int c>
struct X
{
	template<typename F>
	static auto forEach(F func)
	{
		func(c);
		X<c-1>::forEach(func);
	}
};
 
template<>
struct X<0>
{
	template<typename F>
	static auto forEach(F func)
	{
		func(0);
	}
};
 
 
int main()
{
	auto l = [](int a) { std::cout << "loop counter:" << a << std::endl; };
 
	X<4>::forEach(l);
 
	return 0;
}