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boost/format/format_fwd.hpp

// -*- C++ -*-
//  Boost general library 'format'   ---------------------------
//  See http://www.boost.org for updates, documentation, and revision history.

//  (C) Samuel Krempp 2001
//  Permission to copy, use, modify, sell and
//  distribute this software is granted provided this copyright notice appears
//  in all copies. This software is provided "as is" without express or implied
//  warranty, and with no claim as to its suitability for any purpose.

// ideas taken from R�diger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)

// ------------------------------------------------------------------------------
// format_fwd.hpp :  forward declarations, for primary header format.hpp
// ------------------------------------------------------------------------------

#ifndef BOOST_FORMAT_FWD_HPP
#define BOOST_FORMAT_FWD_HPP

#include <string>
#include <iosfwd>

#include <boost/format/detail/config_macros.hpp> 

namespace boost {

    template <class Ch, 
#if !( BOOST_WORKAROUND(__GNUC__, <3) &&  defined(__STL_CONFIG_H) )
        class Tr = BOOST_IO_STD char_traits<Ch> > 
#else
    class Tr = std::string_char_traits<Ch> > 
#endif
    class basic_format;

    typedef basic_format<char >     format;


#if !defined(BOOST_NO_STD_WSTRING)  && !defined(BOOST_NO_STD_WSTREAMBUF) \
 && !defined(BOOST_NO_STRINGSTREAM) && !defined(BOOST_FORMAT_IGNORE_STRINGSTREAM)
    //we use either sstream or strstream, and strstream doesnt support wchar
    typedef basic_format<wchar_t >  wformat;
#endif

    template<class Ch, class Tr> 
    std::basic_string<Ch, Tr>     str(const basic_format<Ch, Tr>& ) ;

namespace io {
    using ::boost::str; // it used to bed define in boost::io, keep compatibility 

    enum format_error_bits { bad_format_string_bit = 1, 
                             too_few_args_bit = 2, too_many_args_bit = 4,
                             out_of_range_bit = 8,
                             all_error_bits = 255, no_error_bits=0 };
                  
} // namespace io


    template< class Ch, class Tr> 
    BOOST_IO_STD basic_ostream<Ch, Tr>& 
    operator<<( BOOST_IO_STD basic_ostream<Ch, Tr>&, const basic_format<Ch, Tr>&);


} // namespace boost

#endif // BOOST_FORMAT_FWD_HPP