#include <iostream>
#include <functional>
 
void call_each_impl(int begin, int end, std::function<void(int)> f);
 
template <typename F>
void call_each(int begin, int end, F f)
{
	call_each_impl(begin, end, f);
}
 
struct test1
{
	void operator()(int i) { std::cout << "[1] " << i << std::endl; }
};
 
void test2(int i)
{
	std::cout << "[2] " << i << std::endl;
}
 
int main() {
	call_each( 1, 4, test1() );
	call_each( 4, 7, test2 );
	return 0;
}
 
void call_each_impl(int begin, int end, std::function<void(int)> f)
{
	for (int i=begin; i<end; ++i)
	{
		f(i);
	}
}
 
 

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