C++ operator overloading question?

Why would:


vectorClass nv = vectors[0] + vectors[1];


cout %26lt;%26lt; vectors[0] %26lt;%26lt; " + " %26lt;%26lt; vectors[1] %26lt;%26lt; " = " %26lt;%26lt; nv %26lt;%26lt; endl;





work, While:





cout %26lt;%26lt; vectors[0] %26lt;%26lt; " + " %26lt;%26lt; vectors[1] %26lt;%26lt; " = " %26lt;%26lt; vectors[0] + vectors[1] %26lt;%26lt; endl;





would not.





Here is some implementation:





vectorClass operator + ( const vectorClass %26amp;left, const vectorClass %26amp;right )


{


int a, b, c;


a = left.x + right.x;


b = left.y + right.y;


c = left.z + right.z;





return vectorClass( a, b, c );





}





ostream %26amp; operator %26lt;%26lt; ( ostream %26amp;out, vectorClass %26amp;right )


{





out %26lt;%26lt; "[" %26lt;%26lt; right.x %26lt;%26lt; ", " %26lt;%26lt; right.y %26lt;%26lt; ", " %26lt;%26lt; right.z %26lt;%26lt; "]";





return out;


}

C++ operator overloading question?
add another overloaded function like this


vectorClass operator + (const vectorClass %26amp;right )


{


int a, b, c;


a = x + right.x;


b = y + right.y;


c = z + right.z;





return vectorClass( a, b, c );





}
Reply:Could it be the simple allocation of the class?


Not a ++ major, but even my old school, we had to allocate the memory....which is what vectorClass nv =





does.