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Vetinari

++ operator overloading

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I would like to overload the ++ operator. I did it for pre-fix (i.e. ++myclass) but I don''t understand how to overload the postfix++ it (i.e. myclass++). Thanks for your help, Mike

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The ++ pre-fix and post-fix operators are the same, the only difference is that with the postfix first the current command is exexcuted and then the ++ operator, with the prefix it''s the other way round. There shouldn''t be a difference with overloaded operators.

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GA

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Sorry ga, there is a difference...

The prefix version:

aclassfunction operator++ ()
{
}

The post-fix version:

aclassfunction operator++(int)
{
}

The ''int'' is just a dummy argument, thats it. Very subtle but very important!

Cheers

Matt

Check out my project at: www.btinternet.com/~Matthew.Bennett

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Guest Anonymous Poster
DataType operator++ ( DataType& a )
{
// prefix
a.item++;
return a;

// postfix
DataType temp = a;
a.item++;
return temp;
}

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3dModelMan is correct: the postfix operator++ needs a dummy argument of int. The prefix operator++ doesn''t need it.

Make sure that you''re returing the correct value: the postfix operator++ should return the value before the increment, the prefix operator++ should return the value after the increment. Of course you''re allowed to use different semantics, but it''ll confuse the users of your code.

Erik

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quote:
Original post by Kaellaar

Anonymous,

++ is a unary operator, that function won''t work.


Is it not possible to declare it that way if you made it a friend function of the class rather than a member?

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I''m sorry for my wrong answer. I never needed overloading the ++ operator so I really didn''t expect that there would be a difference to the usual ++ operator.

Visit our homepage: www.rarebyte.de.st

GA

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I don''t think so, I may be wrong, but I dont'' even think the compiler will let you put anything but an int as a parameter.

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