// (C) Copyright Jonathan Turkanis 2003.

 // Distributed under the Boost Software License, Version 1.0. (See accompanying

 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)

 // See http://www.boost.org/libs/iostreams for documentation.

 //

 // Contains wrappers for standard file buffers, together

 // with convenience typedefs:

 //      - basic_file_source

 //      - basic_file_sink

 //      - basic_file

 //

 #ifndef BOOST_IOSTREAMS_FILE_HPP_INCLUDED

 #define BOOST_IOSTREAMS_FILE_HPP_INCLUDED

 #if defined(_MSC_VER) && (_MSC_VER >= 1020)

 # pragma once

 #endif

 #include <boost/iostreams/detail/config/wide_streams.hpp>

 #ifndef BOOST_IOSTREAMS_NO_LOCALE

 # include <locale>

 #endif

 #include <string>                               // pathnames, char_traits.

 #include <boost/iostreams/categories.hpp>

 #include <boost/iostreams/detail/ios.hpp>       // openmode, seekdir, int types.

 #include <boost/iostreams/detail/fstream.hpp>

 #include <boost/iostreams/operations.hpp>       // seek.

 #include <boost/shared_ptr.hpp>      

 // Must come last.

 #include <boost/iostreams/detail/config/disable_warnings.hpp>  // MSVC.

 namespace boost { namespace iostreams {

 template<typename Ch>

 class basic_file {

 public:

     typedef Ch char_type;

     struct category

         : public seekable_device_tag,

           public closable_tag,

           public localizable_tag

         { };

     basic_file( const std::string& path,

                 BOOST_IOS::openmode mode =

                     BOOST_IOS::in | BOOST_IOS::out,

                 BOOST_IOS::openmode base_mode =

                     BOOST_IOS::in | BOOST_IOS::out );

     std::streamsize read(char_type* s, std::streamsize n);

     std::streamsize write(const char_type* s, std::streamsize n);

     stream_offset seek( stream_offset off, BOOST_IOS::seekdir way, 

                         BOOST_IOS::openmode which = 

                             BOOST_IOS::in | BOOST_IOS::out );

     void open( const std::string& path,

                BOOST_IOS::openmode mode =

                    BOOST_IOS::in | BOOST_IOS::out,

                BOOST_IOS::openmode base_mode =

                    BOOST_IOS::in | BOOST_IOS::out );

     bool is_open() const;

     void close();

 #ifndef BOOST_IOSTREAMS_NO_LOCALE

     void imbue(const std::locale& loc) { pimpl_->file_.pubimbue(loc);  }

 #endif

 private:

     struct impl {

         impl(const std::string& path, BOOST_IOS::openmode mode)

             { file_.open(path.c_str(), mode); }

         ~impl() { if (file_.is_open()) file_.close(); }

         BOOST_IOSTREAMS_BASIC_FILEBUF(Ch) file_;

     };

     shared_ptr<impl> pimpl_;

 };

 typedef basic_file<char>     file;

 typedef basic_file<wchar_t>  wfile;

 template<typename Ch>

 struct basic_file_source : private basic_file<Ch> {

     typedef Ch char_type;

     struct category

         : input_seekable,

           device_tag,

           closable_tag

         { };

     using basic_file<Ch>::read;

     using basic_file<Ch>::seek;

     using basic_file<Ch>::is_open;

     using basic_file<Ch>::close;

     basic_file_source( const std::string& path,

                        BOOST_IOS::openmode mode = 

                            BOOST_IOS::in )

         : basic_file<Ch>(path, mode & ~BOOST_IOS::out, BOOST_IOS::in)

         { }

     void open( const std::string& path,

                BOOST_IOS::openmode mode = BOOST_IOS::in )

     {

         basic_file<Ch>::open(path, mode & ~BOOST_IOS::out, BOOST_IOS::in);

     }

 };

 typedef basic_file_source<char>     file_source;

 typedef basic_file_source<wchar_t>  wfile_source;

 template<typename Ch>

 struct basic_file_sink : private basic_file<Ch> {

     typedef Ch char_type;

     struct category

         : output_seekable,

           device_tag,

           closable_tag

         { };

     using basic_file<Ch>::write;

     using basic_file<Ch>::seek;

     using basic_file<Ch>::is_open;

     using basic_file<Ch>::close;

     basic_file_sink( const std::string& path,

                      BOOST_IOS::openmode mode = BOOST_IOS::out )

         : basic_file<Ch>(path, mode & ~BOOST_IOS::in, BOOST_IOS::out)

         { }

     void open( const std::string& path,

                BOOST_IOS::openmode mode = BOOST_IOS::out )

     {

         basic_file<Ch>::open(path, mode & ~BOOST_IOS::in, BOOST_IOS::out);

     }

 };

 typedef basic_file_sink<char>     file_sink;

 typedef basic_file_sink<wchar_t>  wfile_sink;

 //------------------Implementation of basic_file------------------------------//

 template<typename Ch>

 basic_file<Ch>::basic_file

     ( const std::string& path, BOOST_IOS::openmode mode, 

       BOOST_IOS::openmode base_mode )

 { 

     open(path, mode, base_mode);

 }

 template<typename Ch>

 inline std::streamsize basic_file<Ch>::read

     (char_type* s, std::streamsize n)

 { 

     std::streamsize result = pimpl_->file_.sgetn(s, n); 

     return result != 0 ? result : -1;

 }

 template<typename Ch>

 inline std::streamsize basic_file<Ch>::write

     (const char_type* s, std::streamsize n)

 { return pimpl_->file_.sputn(s, n); }

 template<typename Ch>

 stream_offset basic_file<Ch>::seek

     ( stream_offset off, BOOST_IOS::seekdir way, 

       BOOST_IOS::openmode )

 { return iostreams::seek(pimpl_->file_, off, way); }

 template<typename Ch>

 void basic_file<Ch>::open

     ( const std::string& path, BOOST_IOS::openmode mode, 

       BOOST_IOS::openmode base_mode )

 { 

     pimpl_.reset(new impl(path, mode | base_mode));

 }

 template<typename Ch>

 bool basic_file<Ch>::is_open() const { return pimpl_->file_.is_open(); }

 template<typename Ch>

 void basic_file<Ch>::close() { pimpl_->file_.close(); }

 //----------------------------------------------------------------------------//

 } } // End namespaces iostreams, boost.

 #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC

 #endif // #ifndef BOOST_IOSTREAMS_FILE_HPP_INCLUDED