#include <iostream>
 
    struct range : std::pair<int,int> {
	    struct int_iter {
	        int_iter( int i ) : i(i) {}
	        int operator*() { return i; }
	        int &operator++() { return ++i; }
	        bool operator!=( int_iter end ) const { return i != end.i; }
	    private:    
	        int i;
	    };
        using std::pair<int,int>::pair;
        int_iter begin() const { return int_iter( first ); }
        int_iter end() const { return int_iter(second); }
    };
 
int main() {
	for( auto i : range( 1, 5 ) )
	   std::cout << i << std::endl;
	return 0;
}

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