[Boost-bugs] [Boost C++ Libraries] #7299: Spirit Karma static assert with unicode enabled on Win32 and Win64

Subject: [Boost-bugs] [Boost C++ Libraries] #7299: Spirit Karma static assert with unicode enabled on Win32 and Win64
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-08-28 10:51:51

#7299: Spirit Karma static assert with unicode enabled on Win32 and Win64
--------------------------------------------------------+-------------------
 Reporter:  Dave Bailey <David.Bailey@…>                |       Owner:  djowel 
     Type:  Bugs                                        |      Status:  new    
Milestone:  To Be Determined                            |   Component:  spirit 
  Version:  Boost 1.50.0                                |    Severity:  Problem
 Keywords:  spirit karma unicode                        |  
--------------------------------------------------------+-------------------
 The following code causes a static assert in
 boost/spirit/home/karma/detail/output_iterator.hpp. The problem is that
 buffer_sink stores charactes in a std::basic_string<wchar_t>, but when
 BOOST_SPIRIT_UNICODE is defined, the output character size is 32-bit. On
 Windows, wchar_t is 16-bit, which will always hit the static assert. On
 Linux, wchar_t is 32-bit so we don't have the issue.

 {{{
 #!cpp
 #ifndef BOOST_SPIRIT_UNICODE
 #define BOOST_SPIRIT_UNICODE
 #endif

 #include <boost/config/warning_disable.hpp>
 #include <boost/spirit/home/qi.hpp>
 #include <boost/spirit/home/karma.hpp>
 #include <string>

 namespace karma = boost::spirit::karma;

 template<typename OutputIterator>
 struct unicode_char_
  : public karma::grammar<OutputIterator,
 ::boost::spirit::char_encoding::unicode::char_type()>
 {
     unicode_char_() : base_type(thechar)
     {
         using karma::unicode::char_;
         thechar = char_;
     }
     karma::rule<OutputIterator,
 ::boost::spirit::char_encoding::unicode::char_type()> thechar;
 };

 int main()
 {
     typedef
 std::basic_string<boost::spirit::char_encoding::unicode::char_type>
 unicode_string;
     typedef std::back_insert_iterator<unicode_string>
 unicode_back_insert_iterator_type;

     unicode_string input;
     unicode_string output;

     unicode_back_insert_iterator_type insert_iter(output);

     unicode_char_<unicode_back_insert_iterator_type> unichar;

     karma::generate(insert_iter,unichar,input);

     return 0;
 }

 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7299>
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