[omniORB] function and sequence

[Clarke Brunt]

omniorb-list-bounces at omniorb-support.com wrote:
>> ...temp-destructor, so we would have nothing valid to return. Are
>> there any other ways except "._retn();" here ?
> 
> I think there is no other way, in fact the "retn( )" detach the
> internal pointer from the "var" reference-counting-pointer
> and return it to the caller, the caller has the reponsability to
> destroy the object.

Of course, you could not use the _var at all, i.e.

 Feld *pFeld = new Feld;
 .... // fill in the sequence
 return pFeld;

But of course, this is susceptible to failing to destroy the Feld if an
exception is thrown. Hence the var type, which is designed to help with
this.

Or you could return a _copy_ of the sequence, so that it doesn't matter
when the _var self-destructs:

 Feld_var temp = new Feld;
 ....
 return new Feld(temp.in()); // I think - not tried compiling this

But it's wasteful making a copy, and doesn't look nice.

Much better to use the var as intended, and the _retn().

Clarke Brunt
TRAFFICMASTER PLC
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