Definition of logical true in C++?
 

If I define a function, that shall return -1 in case of error, and a
positive value otherwise:

int foo (int param) {
if (outOfRange (param))
return -1;

return (param != 0);
}

can I rely on this code always working, or is it possible that the
return statement produces a -1 also, on a specific compiler / OS?
Is this defined somewhere? And if so, where in the standard?

Best Regards,

Lars

Re: Definition of logical true in C++?
 

Lars Uffmann wrote:


> can I rely on this code always working, or is it possible that the
> return statement produces a -1 also, on a specific compiler / OS?
> Is this defined somewhere? And if so, where in the standard?

As defined by 4.5/4, boolean true is promoted to 1, boolean false to 0.


--
Sebastian Redl

Re: Definition of logical true in C++?
 

Sebastian Redl wrote:
> As defined by 4.5/4, boolean true is promoted to 1, boolean false to 0.

Thanks, that's all I needed to know - though I just noticed that there's
no easily found online version of the C++ standards - are you able to
point me to one?

Best Regards,

Lars

Re: Definition of logical true in C++?
 

Lars Uffmann wrote:
> Sebastian Redl wrote:
>> As defined by 4.5/4, boolean true is promoted to 1, boolean false to 0.
>
> Thanks, that's all I needed to know - though I just noticed that there's
> no easily found online version of the C++ standards - are you able to
> point me to one?
>
http://webstore.ansi.org/RecordDetai...IEC+14882-2003

--
Ian Collins.

Re: Definition of logical true in C++?
 

Ian Collins wrote:
> http://webstore.ansi.org/RecordDetai...IEC+14882-2003

Hmm - so the standard for THE programming language (imho) is not freely
available?

Not that I mind ordering a copy... just wondrin'... *headscratch*

Thank you :)

Lars

Re: Definition of logical true in C++?
 

Lars Uffmann wrote:

> Ian Collins wrote:
>>
http://webstore.ansi.org/RecordDetai...IEC+14882-2003
>
> Hmm - so the standard for THE programming language (imho) is not freely
> available?

That's correct. ISO makes some money by selling the standard documents.

However, the drafts of the standard are freely available (search for C++
last public draft) and differ from the final version only in some rather
small issues. (The biggest difference I've found so far is in the rules
concerning reinterpret_cast.)

--
Sebastian Redl

Re: Definition of logical true in C++?
 

Lars Uffmann wrote:
> Ian Collins wrote:
>> http://webstore.ansi.org/RecordDetai...IEC+14882-2003
> Not that I mind ordering a copy... just wondrin'... *headscratch*

Argl... That license agreement says "single computer only"... I guess
I'll go for a printed book version :) Amazon, here I come...

Regards,

Lars

C++ Standard hardcopy (was: Re: Definition of logical true in C++?)
 

Sebastian Redl wrote:
> Lars Uffmann wrote:
>
>> Ian Collins wrote:
> http://webstore.ansi.org/RecordDetai...IEC+14882-2003
>> Hmm - so the standard for THE programming language (imho) is not freely
>> available?
>
> That's correct. ISO makes some money by selling the standard documents.

Okay, I guess I don't mind... Thanks for the hint with the drafts.
As for a hardcopy of the standard - all I seem to be able to find is
http://www.amazon.com/C%2B%2B-Standa...0903548&sr=1-1
- is there any other book that I've been overlooking?

Thanks!

Lars

Re: Definition of logical true in C++?
 

* Lars Uffmann:
> Lars Uffmann wrote:
>> Ian Collins wrote:
>>> http://webstore.ansi.org/RecordDetai...IEC+14882-2003
>>
>> Not that I mind ordering a copy... just wondrin'... *headscratch*
>
> Argl... That license agreement says "single computer only"... I guess
> I'll go for a printed book version :) Amazon, here I come...

In order to use the standard, you really need a searchable document.

Without searchability, all you have is a pile of expensive paper,
because relevant paragraphs for some issue are generally scattered
throughout the standard -- because the standard has evolved from a
relatively small document, keeping the document structure while adding
in new stuff and amendning existing text here and there (it really needs
quite a bit of refactoring! :-) ).

I recommend downloading the latest draft from the committee pages (it's
in PDF format), and familiarizing yourself with use of that, before
paying hard cash for flaked dead trees.


Cheers, & hth.,

- Alf

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

Re: Definition of logical true in C++?
 

Alf P. Steinbach wrote:
> In order to use the standard, you really need a searchable document.
Valid point, the thing is, I need the standard as a reference for my
department within the german space agency. A 1-workstation-license isn't
really doing us much good.

> I recommend downloading the latest draft from the committee pages (it's
> in PDF format), and familiarizing yourself with use of that, before
> paying hard cash for flaked dead trees.

I am still having a hard time finding a pdf of the latest draft - C++98
is what I need I guess - and the committee seems to be going out of its
way to hide any download links very well deep down in the site... I'll
keep searching..

Best Regards,

Lars