std::expf and std::logf not recognized by gcc 7.2.0

Question

It seems that gcc (tried 7.2.0 and 5.4.0) does not have std::expf and std::logf - see coliru sample. Since cppreference says they were added in C++11 is there some gcc speci

Answer 1

If you

#include 

you will get

float       exp ( float arg );
double      exp ( double arg );
long double exp ( long double arg );
double      exp ( IntegralType arg );

float       log ( float arg );
double      log ( double arg );
long double log ( long double arg );
double      log ( IntegralType arg );

And hence you can call just std::exp/std::log and let the compiler figure out the overload for you. If you want to call a mismatching overload (e.g. the float overload on a double variable), I find it much more explicit and clear to add a static_cast in those cases:

double bla = ...;
return std::exp(static_cast(bla));

This is a strange construct any way you write it (e.g. why is bla not a float to begin with?), and hiding it in a single-letter function name suffix isn't helping anyone.