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 DstT, typename SrcT>
inline DstT implicit_cast (SrcT const& x) // SrcT can be deduced,
{ // but DstT cannot
return x;
}
int main()
{
double value = implicit_cast<double>(-1);
}