On 19/02/16 20:18 -0700, Orion Poplawski wrote:
octave has template functions that call abs() on templated variables,
something like:
template <class T>
T myfunc(T arg) {
T x = abs(arg);
}
This leads to errors when instantiated for unsigned types because
abs(unsigned type) is not defined as is doesn't make sense to do.
That's fine and all, but how then does one write generic template code
as above that works for signed and unsigned types.
template <class T>
typename std::enable_if<std::is_signed<T>::value, T>::type
generic_abs(T arg) {
return abs(arg);
}
template <class T>
typename std::enable_if<!std::is_signed<T>::value, T>::type
generic_abs(T arg) {
return arg;
}
template <class T>
T myfunc(T arg) {
T x = generic_abs(arg);
}
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