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From: Foster T. B. <fbr...@ad...> - 2005-06-14 21:46:05
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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: > 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()? 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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From: Sean P. <sp...@ad...> - 2005-06-14 21:57:26
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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. > > > >> 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, '?')); 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 > > > > ------------------------------------------------------- > SF.Net email is sponsored by: Discover Easy Linux Migration Strategies > from IBM. Find simple to follow Roadmaps, straightforward articles, > informative Webcasts and more! Get everything you need to get up to > speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click > _______________________________________________ > Adobe-source-devel mailing list > Ado...@li... > https://lists.sourceforge.net/lists/listinfo/adobe-source-devel > > |
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From: Foster T. B. <fbr...@ad...> - 2005-06-14 22:02:16
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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 >> >> >> >> ------------------------------------------------------- >> SF.Net email is sponsored by: Discover Easy Linux Migration Strategies >> from IBM. Find simple to follow Roadmaps, straightforward articles, >> informative Webcasts and more! Get everything you need to get up to >> speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click >> _______________________________________________ >> Adobe-source-devel mailing list >> Ado...@li... >> https://lists.sourceforge.net/lists/listinfo/adobe-source-devel >> >> > > > -- 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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From: Sean P. <sp...@ad...> - 2005-06-14 22:36:03
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>>> >>> >>>> 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). > I understand - this is simply some confusion about how istream::get() works - It returns either a character c or traits::eof() - the reason it returns an int_type is because traits::eof is always out-of-band for the character type (int_type is always larger than char_type). To recover the character use traits::to_char_type(). Sean > > > >> >> >> >>> >>> >>> >>> >>> >>>> 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 >>> >>> >>> >>> ------------------------------------------------------- >>> SF.Net email is sponsored by: Discover Easy Linux Migration >>> Strategies >>> from IBM. Find simple to follow Roadmaps, straightforward articles, >>> informative Webcasts and more! Get everything you need to get up to >>> speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click >>> _______________________________________________ >>> Adobe-source-devel mailing list >>> Ado...@li... >>> https://lists.sourceforge.net/lists/listinfo/adobe-source-devel >>> >>> >>> >>> >> >> >> >> >> > -- > 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 > > > > ------------------------------------------------------- > SF.Net email is sponsored by: Discover Easy Linux Migration Strategies > from IBM. Find simple to follow Roadmaps, straightforward articles, > informative Webcasts and more! Get everything you need to get up to > speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click > _______________________________________________ > Adobe-source-devel mailing list > Ado...@li... > https://lists.sourceforge.net/lists/listinfo/adobe-source-devel > > |
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