Question

How to implement atot() so it uses atof(), atoi(), or atol() according to the type?
Currently it uses atof() for all types:

template<typename T>
T Mtx<T>::atot(const char *s) const
{
    return atof(s);
}

Please note that speed is very important.

Answer 1

The most straight-forward solution is to specialize:

template<>
double Mtx<double>::atot(const char *s) const
{
    return atof(s);
}

template<>
int Mtx<int>::atot(const char *s) const
{
    return atoi(s);
}