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
template <typename FO1, typename FO2>
class Composer {
private:
FO1 fo1; // first/inner function object to call
FO2 fo2; // second/outer function object to call
public:
// constructor: initialize function objects
Composer (FO1 f1, FO2 f2)
: fo1(f1), fo2(f2) {
}
// ``function call'': nested call of function objects
double operator() (double v) {
return fo2(fo1(v));
}
};