/* 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 "math1.hpp"#include "compose4.hpp"#include "composeconv.hpp"template<typename FO>void print_values (FO fo) {    for (int i=-2; i<3; ++i) {        std::cout << "f(" << i*0.1                  << ") = " << fo(i*0.1)                  << "\n";    }}int main(){    // print sin(abs(-0.5))    std::cout << compose(Abs(),Sine())(0.5) << "\n\n";    // print abs() of some values    print_values(Abs());    std::cout << '\n';    // print sin() of some values    print_values(Sine());    std::cout << '\n';    // print sin(abs()) of some values    print_values(compose(Abs(),Sine()));    std::cout << '\n';    // print abs(sin()) of some values    print_values(compose(Sine(),Abs()));    std::cout << '\n';    // print sin(sin()) of some values    print_values(compose(Sine(),Sine()));}