There's some confusion in boost (and in various standard libraries) as to the declaration of std::codecvt<>::do_length The '03 and '11 standards say:

template <class internT, class externT, class stateT> class codecvt : public locale::facet, public codecvt_base { // blah blah blah virtual int do_length(stateT&, const externT* from, const externT* end, size_t max) const; };

But some standard libraries (notably older Dinkumware libraries, and Visual C++ before Visual Studio11) say:

virtual int do_length(const stateT&, const externT* from, const externT* end, size_t max) const; (the first parameter is a const reference)

There's some preprocessor stuff to deal with this in boost/detail/utf8_codecvt_facet.hpp, but it's wrong:

#if !defined(__MSL_CPP__) && !defined(__LIBCOMO__) \ && !defined(_LIBCPP_VERSION) #define BOOST_CODECVT_DO_LENGTH_CONST const #else #define BOOST_CODECVT_DO_LENGTH_CONST #endif

virtual int do_length( BOOST_CODECVT_DO_LENGTH_CONST std::mbstate_t &, const char * from, const char * from_end, std::size_t max_limit #if BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600)) ) const throw(); #else ) const; #endif

I'm happy to fix this, but I'd like to be sure which systems actually have const parameters. I've checked gcc and libc++, and they match the standard. STL assures me that all versions of Visual Studio before VS11 do not match, but VS11 does. The #defines above suggest to me that LibCOMO has this problem as well. Does anyone have access to such an install? And if anyone's standard library (that I haven't listed) does define the first parameter to std::codecvt<>::do_length as a const reference, please let me know. Thanks! -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki