//  Boost io/ios_state.hpp header file  --------------------------------------//

 //  Copyright 2002, 2005 Daryle Walker.  Use, modification, and distribution

 //  are subject to the Boost Software License, Version 1.0.  (See accompanying

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

 //  See <http://www.boost.org/libs/io/> for the library's home page.

 #ifndef BOOST_IO_IOS_STATE_HPP

 #define BOOST_IO_IOS_STATE_HPP

 #include <boost/io_fwd.hpp>  // self include

 #include <boost/detail/workaround.hpp>

 #include <ios>        // for std::ios_base, std::basic_ios, etc.

 #ifndef BOOST_NO_STD_LOCALE

 #include <locale>     // for std::locale

 #endif

 #include <ostream>    // for std::basic_ostream

 #include <streambuf>  // for std::basic_streambuf

 #include <string>     // for std::char_traits

 namespace boost

 {

 namespace io

 {

 //  Basic stream state saver class declarations  -----------------------------//

 class ios_flags_saver

 {

 public:

     typedef ::std::ios_base            state_type;

     typedef ::std::ios_base::fmtflags  aspect_type;

     explicit  ios_flags_saver( state_type &s )

         : s_save_( s ), a_save_( s.flags() )

         {}

     ios_flags_saver( state_type &s, aspect_type const &a )

         : s_save_( s ), a_save_( s.flags(a) )

         {}

     ~ios_flags_saver()

         { this->restore(); }

     void  restore()

         { s_save_.flags( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 class ios_precision_saver

 {

 public:

     typedef ::std::ios_base    state_type;

     typedef ::std::streamsize  aspect_type;

     explicit  ios_precision_saver( state_type &s )

         : s_save_( s ), a_save_( s.precision() )

         {}

     ios_precision_saver( state_type &s, aspect_type const &a )

         : s_save_( s ), a_save_( s.precision(a) )

         {}

     ~ios_precision_saver()

         { this->restore(); }

     void  restore()

         { s_save_.precision( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 class ios_width_saver

 {

 public:

     typedef ::std::ios_base    state_type;

     typedef ::std::streamsize  aspect_type;

     explicit  ios_width_saver( state_type &s )

         : s_save_( s ), a_save_( s.width() )

         {}

     ios_width_saver( state_type &s, aspect_type const &a )

         : s_save_( s ), a_save_( s.width(a) )

         {}

     ~ios_width_saver()

         { this->restore(); }

     void  restore()

         { s_save_.width( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 //  Advanced stream state saver class template declarations  -----------------//

 template < typename Ch, class Tr >

 class basic_ios_iostate_saver

 {

 public:

     typedef ::std::basic_ios<Ch, Tr>  state_type;

     typedef ::std::ios_base::iostate  aspect_type;

     explicit  basic_ios_iostate_saver( state_type &s )

         : s_save_( s ), a_save_( s.rdstate() )

         {}

     basic_ios_iostate_saver( state_type &s, aspect_type const &a )

         : s_save_( s ), a_save_( s.rdstate() )

         { s.clear(a); }

     ~basic_ios_iostate_saver()

         { this->restore(); }

     void  restore()

         { s_save_.clear( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 template < typename Ch, class Tr >

 class basic_ios_exception_saver

 {

 public:

     typedef ::std::basic_ios<Ch, Tr>  state_type;

     typedef ::std::ios_base::iostate  aspect_type;

     explicit  basic_ios_exception_saver( state_type &s )

         : s_save_( s ), a_save_( s.exceptions() )

         {}

 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))

     basic_ios_exception_saver( state_type &s, aspect_type a )

 #else

     basic_ios_exception_saver( state_type &s, aspect_type const &a )

 #endif

         : s_save_( s ), a_save_( s.exceptions() )

         { s.exceptions(a); }

     ~basic_ios_exception_saver()

         { this->restore(); }

     void  restore()

         { s_save_.exceptions( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 template < typename Ch, class Tr >

 class basic_ios_tie_saver

 {

 public:

     typedef ::std::basic_ios<Ch, Tr>        state_type;

     typedef ::std::basic_ostream<Ch, Tr> *  aspect_type;

     explicit  basic_ios_tie_saver( state_type &s )

         : s_save_( s ), a_save_( s.tie() )

         {}

     basic_ios_tie_saver( state_type &s, aspect_type const &a )

         : s_save_( s ), a_save_( s.tie(a) )

         {}

     ~basic_ios_tie_saver()

         { this->restore(); }

     void  restore()

         { s_save_.tie( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 template < typename Ch, class Tr >

 class basic_ios_rdbuf_saver

 {

 public:

     typedef ::std::basic_ios<Ch, Tr>          state_type;

     typedef ::std::basic_streambuf<Ch, Tr> *  aspect_type;

     explicit  basic_ios_rdbuf_saver( state_type &s )

         : s_save_( s ), a_save_( s.rdbuf() )

         {}

     basic_ios_rdbuf_saver( state_type &s, aspect_type const &a )

         : s_save_( s ), a_save_( s.rdbuf(a) )

         {}

     ~basic_ios_rdbuf_saver()

         { this->restore(); }

     void  restore()

         { s_save_.rdbuf( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 template < typename Ch, class Tr >

 class basic_ios_fill_saver

 {

 public:

     typedef ::std::basic_ios<Ch, Tr>        state_type;

     typedef typename state_type::char_type  aspect_type;

     explicit  basic_ios_fill_saver( state_type &s )

         : s_save_( s ), a_save_( s.fill() )

         {}

     basic_ios_fill_saver( state_type &s, aspect_type const &a )

         : s_save_( s ), a_save_( s.fill(a) )

         {}

     ~basic_ios_fill_saver()

         { this->restore(); }

     void  restore()

         { s_save_.fill( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 #ifndef BOOST_NO_STD_LOCALE

 template < typename Ch, class Tr >

 class basic_ios_locale_saver

 {

 public:

     typedef ::std::basic_ios<Ch, Tr> state_type;

     typedef ::std::locale aspect_type;

     explicit basic_ios_locale_saver( state_type &s )

         : s_save_( s ), a_save_( s.getloc() )

         {}

     basic_ios_locale_saver( state_type &s, aspect_type const &a )

         : s_save_( s ), a_save_( s.imbue(a) )

         {}

     ~basic_ios_locale_saver()

         { this->restore(); }

     void  restore()

         { s_save_.imbue( a_save_ ); }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

 };

 #endif

 //  User-defined stream state saver class declarations  ----------------------//

 class ios_iword_saver

 {

 public:

     typedef ::std::ios_base  state_type;

     typedef int              index_type;

     typedef long             aspect_type;

     explicit ios_iword_saver( state_type &s, index_type i )

         : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )

         {}

     ios_iword_saver( state_type &s, index_type i, aspect_type const &a )

         : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )

         { s.iword(i) = a; }

     ~ios_iword_saver()

         { this->restore(); }

     void  restore()

         { s_save_.iword( i_save_ ) = a_save_; }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

     index_type const   i_save_;

 };

 class ios_pword_saver

 {

 public:

     typedef ::std::ios_base  state_type;

     typedef int              index_type;

     typedef void *           aspect_type;

     explicit  ios_pword_saver( state_type &s, index_type i )

         : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )

         {}

     ios_pword_saver( state_type &s, index_type i, aspect_type const &a )

         : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )

         { s.pword(i) = a; }

     ~ios_pword_saver()

         { this->restore(); }

     void  restore()

         { s_save_.pword( i_save_ ) = a_save_; }

 private:

     state_type &       s_save_;

     aspect_type const  a_save_;

     index_type const   i_save_;

 };

 //  Combined stream state saver class (template) declarations  ---------------//

 class ios_base_all_saver

 {

 public:

     typedef ::std::ios_base  state_type;

     explicit  ios_base_all_saver( state_type &s )

         : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )

         , a3_save_( s.width() )

         {}

     ~ios_base_all_saver()

         { this->restore(); }

     void  restore()

     {

         s_save_.width( a3_save_ );

         s_save_.precision( a2_save_ );

         s_save_.flags( a1_save_ );

     }

 private:

     state_type &                s_save_;

     state_type::fmtflags const  a1_save_;

     ::std::streamsize const     a2_save_;

     ::std::streamsize const     a3_save_;

 };

 template < typename Ch, class Tr >

 class basic_ios_all_saver

 {

 public:

     typedef ::std::basic_ios<Ch, Tr>  state_type;

     explicit  basic_ios_all_saver( state_type &s )

         : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )

         , a3_save_( s.width() ), a4_save_( s.rdstate() )

         , a5_save_( s.exceptions() ), a6_save_( s.tie() )

         , a7_save_( s.rdbuf() ), a8_save_( s.fill() )

         #ifndef BOOST_NO_STD_LOCALE

         , a9_save_( s.getloc() )

         #endif

         {}

     ~basic_ios_all_saver()

         { this->restore(); }

     void  restore()

     {

         #ifndef BOOST_NO_STD_LOCALE

         s_save_.imbue( a9_save_ );

         #endif

         s_save_.fill( a8_save_ );

         s_save_.rdbuf( a7_save_ );

         s_save_.tie( a6_save_ );

         s_save_.exceptions( a5_save_ );

         s_save_.clear( a4_save_ );

         s_save_.width( a3_save_ );

         s_save_.precision( a2_save_ );

         s_save_.flags( a1_save_ );

     }

 private:

     state_type &                            s_save_;

     typename state_type::fmtflags const     a1_save_;

     ::std::streamsize const                 a2_save_;

     ::std::streamsize const                 a3_save_;

     typename state_type::iostate const      a4_save_;

     typename state_type::iostate const      a5_save_;

     ::std::basic_ostream<Ch, Tr> * const    a6_save_;

     ::std::basic_streambuf<Ch, Tr> * const  a7_save_;

     typename state_type::char_type const    a8_save_;

     #ifndef BOOST_NO_STD_LOCALE

     ::std::locale const                     a9_save_;

     #endif

 };

 class ios_all_word_saver

 {

 public:

     typedef ::std::ios_base  state_type;

     typedef int              index_type;

     ios_all_word_saver( state_type &s, index_type i )

         : s_save_( s ), i_save_( i ), a1_save_( s.iword(i) )

         , a2_save_( s.pword(i) )

         {}

     ~ios_all_word_saver()

         { this->restore(); }

     void  restore()

     {

         s_save_.pword( i_save_ ) = a2_save_;

         s_save_.iword( i_save_ ) = a1_save_;

     }

 private:

     state_type &      s_save_;

     index_type const  i_save_;

     long const        a1_save_;

     void * const      a2_save_;

 };

 }  // namespace io

 }  // namespace boost

 #endif  // BOOST_IO_IOS_STATE_HPP