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Beginners Question: How to return "NULL" [message #6675]

Wed, 22 November 2006 14:31

WebChaot
Messages: 53
Registered: September 2006
Location: Austria, Vienna

Member

Hi all!

Maybe a stupid question - but how to return "NULL":

I have a function which usually returns an object. But if no object is under the mouse position I want to return something like Null.

But not possible, because "invalid initialization of non-const reference of type 'PosObject&' from a temporary of type 'int'".

Here is the code:

==========================================================
xObject& xLayout :: GetObject(int id)
{
for (int i = xObjects.GetCount() - 1; i >= 0; i--)
{
if (xObjects.At(i).GetId() == id)
{
return xObjects.At(i);
}
}

return NULL; <<< === doesn't work
}
==========================================================

Thanks in advance,

WebChaot

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Re: Beginners Question: How to return "NULL" [message #6676 is a reply to message #6675]

Wed, 22 November 2006 14:37

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

Reference cannot be NULL.

I recommend to make it return pointer (xObject *) instead.

(For me, this is the rule of thumb - if something can be NULL, it is pointer...)

Mirek

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