//--- 借用宏定义实现
#include <stdio.h>

int Function_2()
{    
    return 2;    
}

int Function_1()
{    
    return 1;    
}

int main( int ac, char **av )
{
    printf("stub test:%d\n", Function_1());
#define Function_1 Function_2
    printf("stub test:%d\n", Function_1());
#undef Function_1
    printf("stub test:%d\n", Function_1());

    return 0;
}