A strange operate =

In continent.cpp, function setup(), there is a sentence like following:

CContinentParameters::operator = (pCS->Continent);

My question：
1、As I know before, if we use operator=, we should type a "left value", and a "right value". Let the operator = just "between" these 2 values. AND,
2、If we use operator overloading, we must declare that operator in class, but in class CContinentParameters, there isn't a declaration of "operator=".

Seems it's an expression extend my learned and my imagination. :)

Replies (3)

RE: A strange operate = - Added by rti over 4 years ago

CContinent inherits CContinentParameters.

So writing in a CContinent method

CContinentParameters::operator = ( pCS->Continent );

sets all the members of CContinent which are inherited by CContinentParameters to the values from pCS->Continent.

It should be the same as:

*((CContinentParameters*)this) = pCS->Continent;

Does that help?

RE: A strange operate = - Added by rti over 4 years ago

To answer your questions... ( sorry ^^ )

1. The left value is the current instance, the right value is pCS->Continent.
2. The operator is not overloaded, it is the default one (of the parent class).

RE: A strange operate = - Added by sambsp over 4 years ago

rti,

thank you very much. Seems I must get another cplusplus book to read, haven't found clues from <<C++ Primer Plus>> and <<C++ Primer>> before your answer, or maybe I ignored something, :)

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