thank you, now it works... i re-read tutorial and i noticed that they used
reference for += and notfor + so next time i must be more attentive...
Ben Combee wrote:
> Don't return a reference to myclass, just return a myclass. You
> usually only return references when you are returning one of the
> original arguments to the operator, such as when implementing a stream
> operator for a iostream and a custom class.
>
> myclass myclass::operator+(const myclass& x)
> {
> myclass temp;
>
> temp= ...something...
> return(temp);
> }
>
>
> On 4/19/06, Michal Seliga <[EMAIL PROTECTED]> wrote:
>> did anyone succeeded with this?
>>
>> i have following problem:
>> when i override for example operator + i must return result.
>>
>> in all c++ tutorial i found its easy
>>
>> myclass& myclass::operator+(const myclass& x)
>> {
>> myclass temp;
>>
>> temp= ...something...
>> return(temp);
>> }
>>
>> this doesn'twork in metrowerks (actually i will also get warning during
>> compilation)
>>
>> so another approach, i make temp=new myclass and return *temp
>>
>> this also isn't good idea because allocation will leak and it will never be
>> deleted
>>
>> i tried some more things but still nothing usable... only thing which i
>> think is
>> usable needs a lot of coding and it is called garbage collector, and it is
>> definitely not what i would like to write... will i have to?
>>
>> --
>>
>> what i am writing is actually class for fixed point math. in database we work
>> with quantities and prices. so we need to handle millions, possibly billions
>> and
>> also to have valid 4 decimal places. so far we use double type, but results
>> are
>> very bad ( something like 5-4=0.999999999 and so on).
>>
>> idea was that i will create my own type and change all 'double' to this.
>> problem
>> is that i don't like to rewrite all calculations to something like
>> temp=qty;temp*=price;temp*=discount;temp/=100;
>>
>> when original was temp=qty*price*discount/100, i think everyone understand
>> why ;-)
>>
>> is there any good and working approach how to makeit possible?
>>
>>
>>
>> another possibility is to use long long type and have all numbers multiplied
>> by
>> 10000 and handle this correctly when making multiplications and divisions.
>> but
>> problem is that this code should be portable and long long is not supported
>> properly everywhere (at the moment i am not sure if it was pocket pc team or
>> c++
>> builder which told me this). so i would use it only if everything else will
>> fail
>>
>> any other idea?
>>
>> --
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>
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