The following code example is taken from the book
C++ Templates - The Complete Guide
by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
© Copyright David Vandevoorde and Nicolai M. Josuttis 2002
#include <iostream>
#include <string>
#include <typeinfo>
#include "funcptr.hpp"
double seven()
{
return 7.0;
}
std::string more()
{
return std::string("more");
}
template <typename FunctorT>
void demo (FunctorT func)
{
std::cout << "Functor returns type "
<< typeid(typename FunctorT::ReturnT).name() << '\n'
<< "Functor returns value "
<< func() << '\n';
}
int main()
{
demo(func_ptr(seven));
demo(func_ptr(more));
}