Static member functions

• Static member functions also belong to the class

• Objects can be used to call these functions (but this is confusing).

• Static member functions can be called without an object.

• Static member functions don't have a this pointer.

• And they cannot refer to non-static members in any way.

// point.h
class Point
{
    static int m_x_origin;
    static int m_y_origin;
    static void set_origin( int x_, int y_ );
    //...
};

// point.cpp
void Point::set_origin( int x_, int y_ )
{
    m_x_origin = x_;
    m_y_origin = y_;
}