Re: boolean in C

On 16 Jul 2009, at 14:53, Peter Eisentraut wrote:

> On Thursday 16 July 2009 16:23:31 Grzegorz Jaskiewicz wrote:
>> On 16 Jul 2009, at 14:20, Tom Lane wrote:
>>> Grzegorz Jaskiewicz <gj@pointblue.com.pl> writes:
>>>> oh, another thing.
>>>> stdbool is C99 standard feature.
>>>
>>> We are still targeting C89, not C99.
>>>
>>> Another reason not to depend on stdbool is that, so far as I can  
>>> see,
>>> the standard does not promise that type _Bool has size = 1 byte.
>>> We have to have that because of on-disk compatibility requirements.
>>
>> I think the latter is easily fixable, or forceable to be one byte.
>
> How do you plan to do that?
by casting it to 1 byte type such as char ?
I don't think anyone will add 3rd state to boolean in stdbool, at  
least not any time soon :)

And it is pretty annoying, when your product also has its own BOOLean  
defined...


>
>> Why C89, and not C99 ? Virtually all compilers for last 4 years have/
>> had C99 support.
>
> Well, I think we want to run on systems that are older than 4 years,  
> too.


Sure, but that's probably less than 1% of all systems.
The 4 years was a guess, I think its much more than that.