Re: [boost] Re: Patch for BOOST_STATIC_CONSTANT docs - config-patch.txt

From: David Abrahams (dave_at_[hidden])
Date: 2003-01-26 12:33:38

Shouldn't we stick the -b- option in our borland toolset, since it
increases conformance?

Gennaro Prota <gennaro_prota_at_[hidden]> writes:

> On Sun, 26 Jan 2003 10:05:51 -0500, "Edward Diener"
> <eddielee_at_[hidden]> wrote:
>
>>For Borland, the default is to make enum's int sized but this can be changed
>>with the -b- option in which enums are made as small as possible depending
>>on the range.
>
> Yes. The original problem, anyhow, was not about making them small but
> making them large and giving them the right signedness, like in:
>
>    enum { e = 2147483648u };
>
> Actually the -b- option also has this effect (thus with that option e
> < 0 would yield false, as required by C++) but the help file provided
> with Borland command line tools has an error that can be misleading in
> that regard. It says:
>
>
>    When this option is off (-b-), the compiler allocates the
>    smallest integer that can hold the enumeration values:
>    the compiler allocates an unsigned or signed char if the values
>    of the enumeration are within the range of 0 to 255 (minimum) or
>    -128 to 127 (maximum), or an unsigned or signed short if the values
>    of the enumeration are within the following ranges:
>
>      0 to 4,294,967,295 or -2,147,483,648 to 2,147,483,647
>
>
> It seems to refer only to types not larger than int, leading to think
> that -b- is just a space optimization. Instead it also concerns sign.
>
> Note the last sentence: the ranges are those of unsigned and signed
> *int*, not short :-) Probably there's a whole part in the middle that
> got lost for some reason, which should be:
>
>    ..unsigned or signed short if the values... are within
>
>      0 to 65535  or -32768 to 32767
>
>    or an unsigned or unsigned *int* if they are in
>    the range
>
>
>      0 to 4,294,967,295 or -2,147,483,648 to 2,147,483,647
>
>
> Genny.
>
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-- 
                       David Abrahams
   dave_at_[hidden] * http://www.boost-consulting.com
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