Node:Circle Operators, Next:Querying Circles, Previous:Circle Constructors and Setting Functions, Up:Circle Reference
Circle& operator= (const Circle& c)  Assignment operator 
Makes the Circle a copy of c.

Circle& operator= (const Ellipse& e)  Assignment operator 
Makes the Circle a copy of e, if e is circular.
radius is set to e.axis_v / 2 and
*this is returned.
If e is not circular, this function issues an error message and returns 