##是连接符号,连接两个宏
eg:
#include <iostream>
#define s5(a) supper_##a
void supper_printf(const char* p )
{
printf("this is supper printf:\n%s\n",p);
}
int main()
{
s5(printf)("hello owrld");
std::cout<<"Over"<<std::endl;
getchar();
return 0;
}
原文地址:http://www.cnblogs.com/tiancun/p/3854133.html