Re: [boost] Re: dynamic_bitset tests and help request to Metrowerks users

From: Howard Hinnant (hinnant_at_[hidden])
Date: 2004-05-24 09:15:43

Sorry for the delay in replying.

On May 23, 2004, at 5:33 AM, Gennaro Prota wrote:

> On Sun, 16 May 2004 11:04:45 -0400, Howard Hinnant
> <hinnant_at_[hidden]> wrote:
>
>> I believe this is a compiler error and the only way I'm aware of to
>> work around it is to perform this computation:
>>
>>     const bool no_padding = bits_per_block == CHAR_BIT * 
>> sizeof(Block);
>>     const mode m = table_width >= CHAR_BIT && no_padding
>>                      ? access_by_bytes : access_by_blocks;
>
> Sorry for asking again, but I tried CW9.2 evaluation version and it
> *doesn't* give errors. Since I'm worried that introducing two new
> class templates can trigger warnings/errors with other compilers,
> Would it be ok to write e.g.
>
>   const bool no_padding = bits_per_block == CHAR_BIT * sizeof(Block);
>   const bool table_is_large_enough = table_width >= CHAR_BIT;
>
>   return do_count(
>                   m_bits.begin(), num_blocks(), Block(0),
>                   (mode_to_type<
>                            (no_padding && table_is_large_enough?)
>                            access_by_bytes : access_by_blocks
>> *) 0
>                  );
>
> ?

Yes, I believe this will work.

>> using class static const members instead of function-locale const
>> variables.
>>
>>> ### mwcc Compiler:
>>> #    1419:          const ctype<Ch> & fac = 
>>> BOOST_USE_FACET(ctype<Ch>,
>>> os.getloc());
>>> #   Error:                ^^^^^
>>> #   undefined identifier 'ctype'
>>> #   (included from:
>>> #       dynamic_bitset.hpp:17
>>> #       bitset_test.hpp:27
>>> #       dyn_bitset_unit_tests1.cpp:12)
>>
>> Looks like <locale> is not getting included.
>
> This one is odd. I see that the command line used for regression
> testing includes "-runtime dmd", and our metrowerks config file has
>
> // locale support is disabled when linking with the dynamic runtime
> #   ifdef _MSL_NO_LOCALE
> #     define BOOST_NO_STD_LOCALE
> #   endif
>
> Since I test for BOOST_NO_STD_LOCALE before #including it may well be
> that <locale> is not getting included :) But why everything works with
> CW 9.2 instead? Can you please confirm that _MSL_NO_LOCALE is defined
> for version 8.3 and not for 9.2?

That is correct, for building/using the std::lib in a DLL 
configuration.  When linking statically to the std::lib, _MSL_NO_LOCALE 
is not defined for either release.  When _MSL_NO_LOCALE is defined, 
that means that facets (such as ctype) don't exist as well.  In a 
nutshell, chapter 22 disappears, along with everything that appears in 
the <locale> synopsis.

-Howard