Subj : Re: BC5.02 STL question
To   : borland.public.cpp.borlandcpp
From : Sebastian Ledesma
Date : Mon May 31 2004 04:56 pm

Ed:
I used to think that modern compiler where more smart and: (always assuming
integer math)

++i:
-load, increment, use and store.

i++
- load, use, increment and store.

By using CPU register optimizations should be no difference (but not really
sure about that).

Saludos
Sebastian



"Ed Mulroy [TeamB]" <dont_email_me@bitbuc.ket> escribió en el mensaje
news:40bb7961$2@newsgroups.borland.com...
> When used only to increment, no use of the value:
>
> ++i
> increment and use the value
>
> i++
> load the value,
> save a copy,
> increment the value,
> use the original value
>
> Post increment can call a copy constructor and may have other side
> effects depending upon the details of the object involved.
>
> For an integer where the value is not used in the statement the
> overhead is small but still bad compared to pre-increment.  That is
> probably why the compiler writers decided to make the optimizer detect
> the situation and generate code for pre-increment.
>

.