Static const double in c++

Question

Is this the proper way to use a static const variable? In my top level class (Shape)

#ifndef SHAPE_H
#define SHAPE_H

class Shape
{
public:

    static cons         


        

Answer 1

For primitive data types (like int, double but not char[]) you may also define the constant within the class definition within the header file, e.g.:

class Shape
{
public:
    static const double pi = 3.14159265;

private:
    double originX;
    double originY;
};

This will allow better compiler optimisation.

Edit: As Dennis pointed out below this is only allowed for integral types and not for double or float data types (however some compilers will allow it).