Re: [Adobe-source-devel] Problems with narrow

[Foster T. B. <fbr...@ad...>]

On Jun 14, 2005, at 02:57p, Sean Parent wrote:

>
> On Jun 14, 2005, at 2:45 PM, Foster T. Brereton wrote:
>
>
>> Hey all,
>>
>> I have a cygwin-gcc-specific issue with the following chunk of code:
>>
>>
>>
>>> std::istream::int_type    c_int(stream_m->get());
>>> char                    c(0);
>>>
>>> c = std::use_facet<std::ctype<wchar_t> 
>>> >(std::locale()).narrow(c_int, '?');
>>>
>>>
>>
>> In the cygwin gcc that I have (gcc 3.4.4) I get the following error 
>> in the above line of code:
>>
>
> I'm not sure where wchar_t is coming into play given that c is of type 
> char.

The reason I have to use wchar_t is because narrow's argument is of 
type char_type, which in every case but the wchar_t one is just a char, 
so narrow is a no-op (it would require a static_cast to fit the 
parameter to the argument, at which point narrow is moot).

>
>>
>>
>>
>>> Exception: St8bad_cast
>>>
>>>
>>
>> Has anyone seen this before? Any ideas of a possible workaround? 
>> Anyone know of an easier (yet equally portable) means of narrowing an 
>> int_type value from a stream::get()?
>>
>
> char c (stream_m->narrow(c_int, '?'));

See above.

> Sean
>
>
>
>>
>> Blessings,
>> Foster
>>
>> --
>> Foster T. Brereton              <}}}><              Romans 3:21-26
>> A d o b e   S o f t w a r e   T e c h n o l o g y   L a b
>> "What 99 percent of programmers need to know is not how to build
>> components but how to use them." -- Alexander Stepanov
>>
>>
>>
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>
>
>
--
Foster T. Brereton              <}}}><              Romans 3:21-26
A d o b e   S o f t w a r e   T e c h n o l o g y   L a b
"What 99 percent of programmers need to know is not how to build
components but how to use them." -- Alexander Stepanov