Callback API的测试demo

１．静态函数的回调API

static double
CbOne (double a, double b)
{
std::cout << "invoke cbOne a=" << a << ", b=" << b << std::endl;
return a;
}
int main (int argc, char *argv[])
{
Callback<double, double, double> one;// 类似于定义仿函
one = MakeCallback (&am