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
// addition of two Arrays
template <typename T, typename R1, typename R2>
Array<T,A_Add<T,R1,R2> >
operator+ (Array<T,R1> const& a, Array<T,R2> const& b) {
return Array<T,A_Add<T,R1,R2> >
(A_Add<T,R1,R2>(a.rep(),b.rep()));
}
// multiplication of two Arrays
template <typename T, typename R1, typename R2>
Array<T, A_Mult<T,R1,R2> >
operator* (Array<T,R1> const& a, Array<T,R2> const& b) {
return Array<T,A_Mult<T,R1,R2> >
(A_Mult<T,R1,R2>(a.rep(), b.rep()));
}
// multiplication of scalar and Array
template <typename T, typename R2>
Array<T, A_Mult<T,A_Scalar<T>,R2> >
operator* (T const& s, Array<T,R2> const& b) {
return Array<T,A_Mult<T,A_Scalar<T>,R2> >
(A_Mult<T,A_Scalar<T>,R2>(A_Scalar<T>(s), b.rep()));
}
// multiplication of Array and scalar
// addition of scalar and Array
// addition of Array and scalar
//...