//  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_;



    ios_flags_saver& operator=(const ios_flags_saver&);

};



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_;



    ios_precision_saver& operator=(const ios_precision_saver&);

};



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_;

    ios_width_saver& operator=(const ios_width_saver&);

};





//  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_;



    ios_iword_saver& operator=(const ios_iword_saver&);

};



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_;



    ios_pword_saver operator=(const ios_pword_saver&);

};





//  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_;



    ios_base_all_saver& operator=(const ios_base_all_saver&);

};



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_;



    ios_all_word_saver& operator=(const ios_all_word_saver&);

};





}  // namespace io

}  // namespace boost





#endif  // BOOST_IO_IOS_STATE_HPP

