C++ compiler error: ambiguous call to overloaded function

Question

string aux;
int maxy,auxx=0;

cin>>aux;

maxy= (int)sqrt(aux.size());

I\'m geting:

1> error C2668: \'sqrt\' : ambiguous c         


        

Answer 1

aux.size() returns an std::size_t, but sqrt() does not have an overloaded version that takes a std::size_t argument.

The compiler reports that sqrt has 3 overloads: which take float, double and long double arguments. std::size_t could be converted to any of those, so there's an ambiguity since the compiler doesn't know whether to convert std::size_t to float or double or long double.