#include <stdio.h>

void f( int &a, int &b ) {
    printf( "a: %d, b: %d \n", a, b );
    a = 3;
    b = 4;
}

int main( int argc, char ** argv ) {
    int x = 0;
    f( ++x, ++x );
    printf( "x: %d \n", x );
    return 0;
}