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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