How to overload unary minus operator in C++?
c++, operator-overloading
Solution
Yes, but you don't provide it with a parameter:
class Vector {
...
Vector operator-() {
// your code here
}
};
Note that you should not return *this. The unary - operator needs to create a brand new Vector value, not change the thing it is applied to, so your code may want to look something like this:
class Vector {
...
Vector operator-() const {
Vector v;
v.x = -x;
v.y = -y;
return v;
}
};
Problem
I'm implementing vector class and I need to get an opposite of some vector. Is it possible to define this method using operator overloading? Here's what I mean: ``` Vector2f vector1 = -vector2; ``` Here's what I want this operator to accomplish: ``` Vector2f& oppositeVector(const Vector2f &_vector) { x = -_vector.getX(); y = -_vector.getY(); return *this; } ``` Thanks.