overloading - C++ no match for operator* -

overloading - C++ no match for operator* -

i want overload operator:

static vector operator*(float s, vector right){ vector result(right.getx()*s, right.gety()*s, right.getz()*s); homecoming result; }

when want utilize it:

vector a(0,1,5) vector v(4*a);

i got:

error: no match 'operator*' (operand types 'int' , 'vector')

what wrong?

you need declare (within class declaration) operator* non-static non-member , friend like:

friend vector operator*(float s, vector right);

and define (outside class declaration):

vector operator*(float s, vector right){ homecoming vector(right.getx()*s, right.gety()*s, right.getz()*s); }

operator * used binary operator here. if create member, first argument implicitly taken current object (on * applies, example, if utilize x * y, operator * applies on x member). however, non-member both arguments can non-vector type , can converted vector if needed. work if create non-member non-friend , static (tobe defined outside class declaration)

c++ overloading operator-keyword