id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
4496,xpressive::as<int>(_) does not work with wchar_t,anonymous,Eric Niebler,"

{{{
  using namespace boost::xpressive;

  std::wstring version(L""0.9.500"");

  int maj1(0), min1(0), build1(0);

  wsregex re1 = (+_d)[ref(maj1) = as<int>(_)] >> L""."" >>
                (+_d)[ref(min1) = as<int>(_)] >> L""."" >>
                (+_d)[ref(build1) = as<int>(_)];

  bool v1 = regex_match(version, re1);

  std::wcout << maj1 << std::endl;    // 48      must be 0
  std::wcout << min1 << std::endl;    // 57      must be 9
  std::wcout << build1 << std::endl;  // 534848  must be 500
}}}

The cause is


{{{
        template<typename T>
        struct as
        {
            typedef T result_type;

            template<typename Value>
            T operator()(Value const &val) const
            {
                return lexical_cast<T>(val);
            }
        };
}}}

val is sub_match type (this case)

lexical_cast<T> uses stream_char<T> to define the widest char
while there is no spec for stream_char<xpressive::sub_match>
so lexical_cast uses char as char_type",Bugs,closed,Boost 1.44.0,xpressive,Boost 1.44.0,Problem,fixed,xpressive regex_actions,