overloading *, +, -'operators for vector class

Question

I\'m writing a Line class to make numerical methods and I want these operators (*, +, -) to make my code more readable and easier to understand.

Answer 1

You have to overload the operators at global scope:

vector operator*(const vector& v, double alfa)
{
    ...
}

vector operator+(const vector& v1, const vector& v2)
{
    ...
}

vector operator-(const vector& v1, const vector& v2)
{
    ...
}

As for the linker errors, it just looks like you didn't implement the Line constructor and destructor.