/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <iostream>#include "isclasst.hpp"class MyClass {};struct MyStruct {};union MyUnion {};void myfunc(){}enum E { e1 } e;// check by passing type as template argumenttemplate <typename T>void check(){    if (IsClassT<T>::Yes) {        std::cout << " IsClassT " << std::endl;    }    else {        std::cout << " !IsClassT " << std::endl;    }}// check by passing type as function call argumenttemplate <typename T>void checkT (T){    check<T>();}int main(){    std::cout << "int:     ";    check<int>();    std::cout << "MyClass: ";    check<MyClass>();    std::cout << "MyStruct:";    MyStruct s;    checkT(s);    std::cout << "MyUnion: ";    check<MyUnion>();    std::cout << "enum:    ";    checkT(e);    std::cout << "myfunc():";    checkT(myfunc);}