How to call ceil function in c++ from my classes's ceil function -

i need delegate 'ceil' function. class has method 'ceil', need return cpp's native method 'ceil'. how call it?

double ceil() { return ceil(); }

- recursion

double ceil() {     return ::ceil(something); // ceil has argument }

of course, above when define method inside class definition; following when define method outside class:

double myclass::ceil() {     return ::ceil(something); }

and comment suggests, using std::ceil included <cmath> better, because indeed, ::ceil not guaranteed ceil c library.

EIght