williamr@2: //  Boost io/ios_state.hpp header file  --------------------------------------//
williamr@2: 
williamr@2: //  Copyright 2002, 2005 Daryle Walker.  Use, modification, and distribution
williamr@2: //  are subject to the Boost Software License, Version 1.0.  (See accompanying
williamr@2: //  file LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
williamr@2: 
williamr@2: //  See <http://www.boost.org/libs/io/> for the library's home page.
williamr@2: 
williamr@2: #ifndef BOOST_IO_IOS_STATE_HPP
williamr@2: #define BOOST_IO_IOS_STATE_HPP
williamr@2: 
williamr@2: #include <boost/io_fwd.hpp>  // self include
williamr@2: #include <boost/detail/workaround.hpp>
williamr@2: 
williamr@2: #include <ios>        // for std::ios_base, std::basic_ios, etc.
williamr@2: #ifndef BOOST_NO_STD_LOCALE
williamr@2: #include <locale>     // for std::locale
williamr@2: #endif
williamr@2: #include <ostream>    // for std::basic_ostream
williamr@2: #include <streambuf>  // for std::basic_streambuf
williamr@2: #include <string>     // for std::char_traits
williamr@2: 
williamr@2: namespace boost
williamr@2: {
williamr@2: namespace io
williamr@2: {
williamr@2: 
williamr@2: 
williamr@2: //  Basic stream state saver class declarations  -----------------------------//
williamr@2: 
williamr@2: class ios_flags_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::ios_base            state_type;
williamr@2:     typedef ::std::ios_base::fmtflags  aspect_type;
williamr@2: 
williamr@2:     explicit  ios_flags_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.flags() )
williamr@2:         {}
williamr@2:     ios_flags_saver( state_type &s, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.flags(a) )
williamr@2:         {}
williamr@2:     ~ios_flags_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.flags( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: 
williamr@2: class ios_precision_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::ios_base    state_type;
williamr@2:     typedef ::std::streamsize  aspect_type;
williamr@2: 
williamr@2:     explicit  ios_precision_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.precision() )
williamr@2:         {}
williamr@2:     ios_precision_saver( state_type &s, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.precision(a) )
williamr@2:         {}
williamr@2:     ~ios_precision_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.precision( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: 
williamr@2: class ios_width_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::ios_base    state_type;
williamr@2:     typedef ::std::streamsize  aspect_type;
williamr@2: 
williamr@2:     explicit  ios_width_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.width() )
williamr@2:         {}
williamr@2:     ios_width_saver( state_type &s, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.width(a) )
williamr@2:         {}
williamr@2:     ~ios_width_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.width( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: 
williamr@2: 
williamr@2: //  Advanced stream state saver class template declarations  -----------------//
williamr@2: 
williamr@2: template < typename Ch, class Tr >
williamr@2: class basic_ios_iostate_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::basic_ios<Ch, Tr>  state_type;
williamr@2:     typedef ::std::ios_base::iostate  aspect_type;
williamr@2: 
williamr@2:     explicit  basic_ios_iostate_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.rdstate() )
williamr@2:         {}
williamr@2:     basic_ios_iostate_saver( state_type &s, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.rdstate() )
williamr@2:         { s.clear(a); }
williamr@2:     ~basic_ios_iostate_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.clear( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: 
williamr@2: template < typename Ch, class Tr >
williamr@2: class basic_ios_exception_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::basic_ios<Ch, Tr>  state_type;
williamr@2:     typedef ::std::ios_base::iostate  aspect_type;
williamr@2: 
williamr@2:     explicit  basic_ios_exception_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.exceptions() )
williamr@2:         {}
williamr@2: #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
williamr@2:     basic_ios_exception_saver( state_type &s, aspect_type a )
williamr@2: #else
williamr@2:     basic_ios_exception_saver( state_type &s, aspect_type const &a )
williamr@2: #endif
williamr@2:         : s_save_( s ), a_save_( s.exceptions() )
williamr@2:         { s.exceptions(a); }
williamr@2:     ~basic_ios_exception_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.exceptions( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: 
williamr@2: template < typename Ch, class Tr >
williamr@2: class basic_ios_tie_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::basic_ios<Ch, Tr>        state_type;
williamr@2:     typedef ::std::basic_ostream<Ch, Tr> *  aspect_type;
williamr@2: 
williamr@2:     explicit  basic_ios_tie_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.tie() )
williamr@2:         {}
williamr@2:     basic_ios_tie_saver( state_type &s, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.tie(a) )
williamr@2:         {}
williamr@2:     ~basic_ios_tie_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.tie( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: 
williamr@2: template < typename Ch, class Tr >
williamr@2: class basic_ios_rdbuf_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::basic_ios<Ch, Tr>          state_type;
williamr@2:     typedef ::std::basic_streambuf<Ch, Tr> *  aspect_type;
williamr@2: 
williamr@2:     explicit  basic_ios_rdbuf_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.rdbuf() )
williamr@2:         {}
williamr@2:     basic_ios_rdbuf_saver( state_type &s, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.rdbuf(a) )
williamr@2:         {}
williamr@2:     ~basic_ios_rdbuf_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.rdbuf( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: 
williamr@2: template < typename Ch, class Tr >
williamr@2: class basic_ios_fill_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::basic_ios<Ch, Tr>        state_type;
williamr@2:     typedef typename state_type::char_type  aspect_type;
williamr@2: 
williamr@2:     explicit  basic_ios_fill_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.fill() )
williamr@2:         {}
williamr@2:     basic_ios_fill_saver( state_type &s, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.fill(a) )
williamr@2:         {}
williamr@2:     ~basic_ios_fill_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.fill( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: 
williamr@2: #ifndef BOOST_NO_STD_LOCALE
williamr@2: template < typename Ch, class Tr >
williamr@2: class basic_ios_locale_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::basic_ios<Ch, Tr> state_type;
williamr@2:     typedef ::std::locale aspect_type;
williamr@2: 
williamr@2:     explicit basic_ios_locale_saver( state_type &s )
williamr@2:         : s_save_( s ), a_save_( s.getloc() )
williamr@2:         {}
williamr@2:     basic_ios_locale_saver( state_type &s, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.imbue(a) )
williamr@2:         {}
williamr@2:     ~basic_ios_locale_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.imbue( a_save_ ); }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2: };
williamr@2: #endif
williamr@2: 
williamr@2: 
williamr@2: //  User-defined stream state saver class declarations  ----------------------//
williamr@2: 
williamr@2: class ios_iword_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::ios_base  state_type;
williamr@2:     typedef int              index_type;
williamr@2:     typedef long             aspect_type;
williamr@2: 
williamr@2:     explicit ios_iword_saver( state_type &s, index_type i )
williamr@2:         : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )
williamr@2:         {}
williamr@2:     ios_iword_saver( state_type &s, index_type i, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )
williamr@2:         { s.iword(i) = a; }
williamr@2:     ~ios_iword_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.iword( i_save_ ) = a_save_; }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2:     index_type const   i_save_;
williamr@2: };
williamr@2: 
williamr@2: class ios_pword_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::ios_base  state_type;
williamr@2:     typedef int              index_type;
williamr@2:     typedef void *           aspect_type;
williamr@2: 
williamr@2:     explicit  ios_pword_saver( state_type &s, index_type i )
williamr@2:         : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )
williamr@2:         {}
williamr@2:     ios_pword_saver( state_type &s, index_type i, aspect_type const &a )
williamr@2:         : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )
williamr@2:         { s.pword(i) = a; }
williamr@2:     ~ios_pword_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:         { s_save_.pword( i_save_ ) = a_save_; }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &       s_save_;
williamr@2:     aspect_type const  a_save_;
williamr@2:     index_type const   i_save_;
williamr@2: };
williamr@2: 
williamr@2: 
williamr@2: //  Combined stream state saver class (template) declarations  ---------------//
williamr@2: 
williamr@2: class ios_base_all_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::ios_base  state_type;
williamr@2: 
williamr@2:     explicit  ios_base_all_saver( state_type &s )
williamr@2:         : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )
williamr@2:         , a3_save_( s.width() )
williamr@2:         {}
williamr@2: 
williamr@2:     ~ios_base_all_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:     {
williamr@2:         s_save_.width( a3_save_ );
williamr@2:         s_save_.precision( a2_save_ );
williamr@2:         s_save_.flags( a1_save_ );
williamr@2:     }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &                s_save_;
williamr@2:     state_type::fmtflags const  a1_save_;
williamr@2:     ::std::streamsize const     a2_save_;
williamr@2:     ::std::streamsize const     a3_save_;
williamr@2: };
williamr@2: 
williamr@2: template < typename Ch, class Tr >
williamr@2: class basic_ios_all_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::basic_ios<Ch, Tr>  state_type;
williamr@2: 
williamr@2:     explicit  basic_ios_all_saver( state_type &s )
williamr@2:         : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )
williamr@2:         , a3_save_( s.width() ), a4_save_( s.rdstate() )
williamr@2:         , a5_save_( s.exceptions() ), a6_save_( s.tie() )
williamr@2:         , a7_save_( s.rdbuf() ), a8_save_( s.fill() )
williamr@2:         #ifndef BOOST_NO_STD_LOCALE
williamr@2:         , a9_save_( s.getloc() )
williamr@2:         #endif
williamr@2:         {}
williamr@2: 
williamr@2:     ~basic_ios_all_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:     {
williamr@2:         #ifndef BOOST_NO_STD_LOCALE
williamr@2:         s_save_.imbue( a9_save_ );
williamr@2:         #endif
williamr@2:         s_save_.fill( a8_save_ );
williamr@2:         s_save_.rdbuf( a7_save_ );
williamr@2:         s_save_.tie( a6_save_ );
williamr@2:         s_save_.exceptions( a5_save_ );
williamr@2:         s_save_.clear( a4_save_ );
williamr@2:         s_save_.width( a3_save_ );
williamr@2:         s_save_.precision( a2_save_ );
williamr@2:         s_save_.flags( a1_save_ );
williamr@2:     }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &                            s_save_;
williamr@2:     typename state_type::fmtflags const     a1_save_;
williamr@2:     ::std::streamsize const                 a2_save_;
williamr@2:     ::std::streamsize const                 a3_save_;
williamr@2:     typename state_type::iostate const      a4_save_;
williamr@2:     typename state_type::iostate const      a5_save_;
williamr@2:     ::std::basic_ostream<Ch, Tr> * const    a6_save_;
williamr@2:     ::std::basic_streambuf<Ch, Tr> * const  a7_save_;
williamr@2:     typename state_type::char_type const    a8_save_;
williamr@2:     #ifndef BOOST_NO_STD_LOCALE
williamr@2:     ::std::locale const                     a9_save_;
williamr@2:     #endif
williamr@2: };
williamr@2: 
williamr@2: class ios_all_word_saver
williamr@2: {
williamr@2: public:
williamr@2:     typedef ::std::ios_base  state_type;
williamr@2:     typedef int              index_type;
williamr@2: 
williamr@2:     ios_all_word_saver( state_type &s, index_type i )
williamr@2:         : s_save_( s ), i_save_( i ), a1_save_( s.iword(i) )
williamr@2:         , a2_save_( s.pword(i) )
williamr@2:         {}
williamr@2: 
williamr@2:     ~ios_all_word_saver()
williamr@2:         { this->restore(); }
williamr@2: 
williamr@2:     void  restore()
williamr@2:     {
williamr@2:         s_save_.pword( i_save_ ) = a2_save_;
williamr@2:         s_save_.iword( i_save_ ) = a1_save_;
williamr@2:     }
williamr@2: 
williamr@2: private:
williamr@2:     state_type &      s_save_;
williamr@2:     index_type const  i_save_;
williamr@2:     long const        a1_save_;
williamr@2:     void * const      a2_save_;
williamr@2: };
williamr@2: 
williamr@2: 
williamr@2: }  // namespace io
williamr@2: }  // namespace boost
williamr@2: 
williamr@2: 
williamr@2: #endif  // BOOST_IO_IOS_STATE_HPP