C + + NetEase cloud Classroom development Engineer-Operator overloading

1. Operator overloading, (you can use member functions, or you can use non-member functions) this

all of the member functions hide a parameter , this.

This binds the caller to each other.

complex c1,c2; for the addition of two complex numbers, add the left side to the right.

Inline complex&

Complex::operator + = (this, const complex& r) {This is usually a hidden

Return _DOAPL (this, r);

}

2.return by reference Syntax analysis

Inline Complex&

_DOAPL (complex* ths, const complex& r) {

return *ths;

}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Inline complex& This A part can have a return type, or it can not use a return type.

Complex::operator + = (Const complex& r) {However, if you want to use continuous addition, you will no longer be able to use an example : C3 + = C2 + = C1;

Return __DOAPL (THIS,R);

}

3. Operator overloading of non-member functions

Inline complex This Why not use references in a place?

operator + (const complex& x, const complex& y) {

Return complex (real (x) + real (y), imag (x) + imag (y));

}

~~~~~~~~ Why not return a reference? ~~~~~~~~~

Because the returned thing is location, is the temporary object.

TypeName () complex () creates a temporary object, Important!

C + + NetEase cloud Classroom development Engineer-Operator overloading