Parameters in function in separate initialization and definition

Question

When a function's initialization and definition is split, and it requires parameters on them both, how do I format that? In this code (excluding include and namespace):

class CVector {
public:
int x,y;
CVector () {};
CVector (int a,int b) : x(a), y(b) {}
CVector operator + (const CVector&);
};

CVector CVector::operator+ (const CVector& param) {
CVector temp;
temp.x = x + param.x;
temp.y = y + param.y;
return temp;
}

int main () {
CVector foo (3,1);
CVector bar (1,2);
CVector result;
result = foo + bar;
cout << result.x << ',' << result.y << '\n';
return 0;
}

The CVector constructor initialization parameter is an anonymous CVector reference, but in the definition, it is a CVector reference called param. So, when having them split, should I have an anonymous data type in the init and a reference variable in the definition? Thanks!

Answer 1

It is ok to only define the type of parameter in declaration (name is not mandatory), name is mandatory in the definition, because a need to refer to the parameter is likely to happen.