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 <cmath>
#include <cstdlib>
class Abs {
public:
// ``function call'':
double operator() (double v) const {
return std::abs(v);
}
};
class Sine {
public:
// ``function call'':
double operator() (double a) const {
return std::sin(a);
}
};