Johnathan, Actually, the problem was that line_wrapping_output_filter needs to derive from output_wfilter not output_filter for Unicode applications. The code that I posted previously derives line_wrapping_output_filter<__wchar_t> from output_filter. The fact that this compiles and works is problematic because it introduces a certain ambiguity that may bite in the future.
(You might run into trouble if you use /Zc:wchar_t, I'm not sure.)<
That's only a problem if you compile the library with a different setting than the application to which it is linked. I have tried it both ways without problem. There is a bug in regex_filter.hpp line 58: basic_regex_filter( const regex_type& re, -- const char* fmt, // ++ const char_type* fmt, flag_type flags = regex_constants::match_default, flag_type fmt_flags = regex_constants::format_default ) Regards, George.