bi-directional operator overloading

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Vector.h

friend Vector& operator* (const double &factor, const Vector &v); friend Vector& operator* (const Vector &v,const double &factor);

Vector.cpp

Vector& operator *(const double &factor, Vector &v){ v.x=v.x*factor; v.y=v.y*factor; return v; } Vector& operator* (const Vector &v,const double &factor){ return factor * v; }

And for some readon i get the error at my Vector.cpp file, Vector& operator* (const Vector &v,const double &factor) -function

undefined reference to `operator*(double const&, Vector const&)'

What am i doing wrong... ?

Your declaration and definition function signatures differ!

πάντα ῥεῖ
– πάντα ῥεῖ

2015-05-10 16:47:36 +00:00
Commented May 10, 2015 at 16:47 — πάντα ῥεῖ
– πάντα ῥεῖ, Commented May 10, 2015 at 16:47

πάντα ῥεῖ · Accepted Answer · 2015-05-10 17:05:15Z

As mentioned in my comment, the error occurs, because your function declaration and definition signatures differ.

Anyway with a free standing operator function one would expect to get a new Vector instance, instead of getting a reference to the one passed.

Declare / define your operator functions as follows:

friend Vector operator* (const Vector &v,double factor); friend Vector operator* (double factor, const Vector &v); Vector operator *(double factor, const Vector &v) { Vector result = v; result.x=result.x*factor; result.y=result.y*factor; return result; } Vector operator* (const Vector &v,double factor) { return factor * v; }

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