/* 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 "rparam.hpp"#include "rparamcls.hpp"// function that allows parameter passing by value or by referencetemplate <typename T1, typename T2>void foo_core (typename RParam<T1>::Type p1,               typename RParam<T2>::Type p2){    //...}// wrapper to avoid explicit template parameter passingtemplate <typename T1, typename T2>inlinevoid foo (T1 const & p1, T2 const & p2) {    foo_core<T1,T2>(p1,p2);}int main(){    MyClass1 mc1;    MyClass2 mc2;    foo(mc1,mc2);  // same as foo_core<MyClass1,MyClass2>(mc1,mc2)}