imgtools/imglib/boostlibrary/boost/io/ios_state.hpp
author Jon Chatten
Thu, 10 Dec 2009 15:35:48 +0000
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//  Boost io/ios_state.hpp header file  --------------------------------------//
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//  Copyright 2002, 2005 Daryle Walker.  Use, modification, and distribution
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//  are subject to the Boost Software License, Version 1.0.  (See accompanying
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//  file LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
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//  See <http://www.boost.org/libs/io/> for the library's home page.
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#ifndef BOOST_IO_IOS_STATE_HPP
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#define BOOST_IO_IOS_STATE_HPP
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#include <boost/io_fwd.hpp>  // self include
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#include <boost/detail/workaround.hpp>
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#include <ios>        // for std::ios_base, std::basic_ios, etc.
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#ifndef BOOST_NO_STD_LOCALE
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#include <locale>     // for std::locale
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#endif
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#include <ostream>    // for std::basic_ostream
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#include <streambuf>  // for std::basic_streambuf
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#include <string>     // for std::char_traits
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namespace boost
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{
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namespace io
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{
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//  Basic stream state saver class declarations  -----------------------------//
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class ios_flags_saver
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{
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public:
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    typedef ::std::ios_base            state_type;
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    typedef ::std::ios_base::fmtflags  aspect_type;
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    explicit  ios_flags_saver( state_type &s )
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        : s_save_( s ), a_save_( s.flags() )
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        {}
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    ios_flags_saver( state_type &s, aspect_type const &a )
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        : s_save_( s ), a_save_( s.flags(a) )
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        {}
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    ~ios_flags_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.flags( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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    ios_flags_saver& operator=(const ios_flags_saver&);
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};
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class ios_precision_saver
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{
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public:
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    typedef ::std::ios_base    state_type;
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    typedef ::std::streamsize  aspect_type;
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    explicit  ios_precision_saver( state_type &s )
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        : s_save_( s ), a_save_( s.precision() )
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        {}
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    ios_precision_saver( state_type &s, aspect_type const &a )
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        : s_save_( s ), a_save_( s.precision(a) )
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        {}
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    ~ios_precision_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.precision( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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    ios_precision_saver& operator=(const ios_precision_saver&);
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};
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class ios_width_saver
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{
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public:
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    typedef ::std::ios_base    state_type;
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    typedef ::std::streamsize  aspect_type;
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    explicit  ios_width_saver( state_type &s )
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        : s_save_( s ), a_save_( s.width() )
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        {}
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    ios_width_saver( state_type &s, aspect_type const &a )
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        : s_save_( s ), a_save_( s.width(a) )
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        {}
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    ~ios_width_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.width( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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    ios_width_saver& operator=(const ios_width_saver&);
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};
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//  Advanced stream state saver class template declarations  -----------------//
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template < typename Ch, class Tr >
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class basic_ios_iostate_saver
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{
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public:
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    typedef ::std::basic_ios<Ch, Tr>  state_type;
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    typedef ::std::ios_base::iostate  aspect_type;
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    explicit  basic_ios_iostate_saver( state_type &s )
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        : s_save_( s ), a_save_( s.rdstate() )
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        {}
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    basic_ios_iostate_saver( state_type &s, aspect_type const &a )
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        : s_save_( s ), a_save_( s.rdstate() )
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        { s.clear(a); }
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    ~basic_ios_iostate_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.clear( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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};
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template < typename Ch, class Tr >
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class basic_ios_exception_saver
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{
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public:
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    typedef ::std::basic_ios<Ch, Tr>  state_type;
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    typedef ::std::ios_base::iostate  aspect_type;
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    explicit  basic_ios_exception_saver( state_type &s )
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        : s_save_( s ), a_save_( s.exceptions() )
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        {}
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#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
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    basic_ios_exception_saver( state_type &s, aspect_type a )
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#else
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    basic_ios_exception_saver( state_type &s, aspect_type const &a )
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#endif
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        : s_save_( s ), a_save_( s.exceptions() )
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        { s.exceptions(a); }
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    ~basic_ios_exception_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.exceptions( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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};
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template < typename Ch, class Tr >
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class basic_ios_tie_saver
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{
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public:
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    typedef ::std::basic_ios<Ch, Tr>        state_type;
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    typedef ::std::basic_ostream<Ch, Tr> *  aspect_type;
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    explicit  basic_ios_tie_saver( state_type &s )
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        : s_save_( s ), a_save_( s.tie() )
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        {}
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    basic_ios_tie_saver( state_type &s, aspect_type const &a )
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        : s_save_( s ), a_save_( s.tie(a) )
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        {}
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    ~basic_ios_tie_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.tie( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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};
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template < typename Ch, class Tr >
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class basic_ios_rdbuf_saver
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{
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public:
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    typedef ::std::basic_ios<Ch, Tr>          state_type;
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    typedef ::std::basic_streambuf<Ch, Tr> *  aspect_type;
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    explicit  basic_ios_rdbuf_saver( state_type &s )
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        : s_save_( s ), a_save_( s.rdbuf() )
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        {}
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    basic_ios_rdbuf_saver( state_type &s, aspect_type const &a )
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        : s_save_( s ), a_save_( s.rdbuf(a) )
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        {}
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    ~basic_ios_rdbuf_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.rdbuf( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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};
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template < typename Ch, class Tr >
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class basic_ios_fill_saver
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{
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public:
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    typedef ::std::basic_ios<Ch, Tr>        state_type;
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    typedef typename state_type::char_type  aspect_type;
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    explicit  basic_ios_fill_saver( state_type &s )
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        : s_save_( s ), a_save_( s.fill() )
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        {}
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    basic_ios_fill_saver( state_type &s, aspect_type const &a )
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        : s_save_( s ), a_save_( s.fill(a) )
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        {}
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    ~basic_ios_fill_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.fill( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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};
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#ifndef BOOST_NO_STD_LOCALE
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template < typename Ch, class Tr >
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class basic_ios_locale_saver
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{
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public:
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    typedef ::std::basic_ios<Ch, Tr> state_type;
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    typedef ::std::locale aspect_type;
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    explicit basic_ios_locale_saver( state_type &s )
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        : s_save_( s ), a_save_( s.getloc() )
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        {}
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    basic_ios_locale_saver( state_type &s, aspect_type const &a )
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        : s_save_( s ), a_save_( s.imbue(a) )
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        {}
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    ~basic_ios_locale_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.imbue( a_save_ ); }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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};
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#endif
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//  User-defined stream state saver class declarations  ----------------------//
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class ios_iword_saver
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{
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public:
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    typedef ::std::ios_base  state_type;
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    typedef int              index_type;
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    typedef long             aspect_type;
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    explicit ios_iword_saver( state_type &s, index_type i )
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        : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )
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        {}
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    ios_iword_saver( state_type &s, index_type i, aspect_type const &a )
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        : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )
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        { s.iword(i) = a; }
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    ~ios_iword_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.iword( i_save_ ) = a_save_; }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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    index_type const   i_save_;
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    ios_iword_saver& operator=(const ios_iword_saver&);
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};
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class ios_pword_saver
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{
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public:
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    typedef ::std::ios_base  state_type;
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    typedef int              index_type;
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    typedef void *           aspect_type;
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    explicit  ios_pword_saver( state_type &s, index_type i )
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        : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )
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        {}
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    ios_pword_saver( state_type &s, index_type i, aspect_type const &a )
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        : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )
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        { s.pword(i) = a; }
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    ~ios_pword_saver()
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        { this->restore(); }
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    void  restore()
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        { s_save_.pword( i_save_ ) = a_save_; }
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private:
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    state_type &       s_save_;
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    aspect_type const  a_save_;
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    index_type const   i_save_;
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    ios_pword_saver operator=(const ios_pword_saver&);
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};
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//  Combined stream state saver class (template) declarations  ---------------//
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class ios_base_all_saver
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{
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public:
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    typedef ::std::ios_base  state_type;
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    explicit  ios_base_all_saver( state_type &s )
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        : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )
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        , a3_save_( s.width() )
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        {}
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    ~ios_base_all_saver()
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        { this->restore(); }
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   331
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    void  restore()
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    {
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        s_save_.width( a3_save_ );
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        s_save_.precision( a2_save_ );
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        s_save_.flags( a1_save_ );
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    }
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private:
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    state_type &                s_save_;
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    state_type::fmtflags const  a1_save_;
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    ::std::streamsize const     a2_save_;
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    ::std::streamsize const     a3_save_;
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    ios_base_all_saver& operator=(const ios_base_all_saver&);
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};
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   347
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   348
template < typename Ch, class Tr >
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class basic_ios_all_saver
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{
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public:
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    typedef ::std::basic_ios<Ch, Tr>  state_type;
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    explicit  basic_ios_all_saver( state_type &s )
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        : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )
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        , a3_save_( s.width() ), a4_save_( s.rdstate() )
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        , a5_save_( s.exceptions() ), a6_save_( s.tie() )
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        , a7_save_( s.rdbuf() ), a8_save_( s.fill() )
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        #ifndef BOOST_NO_STD_LOCALE
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        , a9_save_( s.getloc() )
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   361
        #endif
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        {}
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   363
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   364
    ~basic_ios_all_saver()
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   365
        { this->restore(); }
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   366
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   367
    void  restore()
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   368
    {
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   369
        #ifndef BOOST_NO_STD_LOCALE
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   370
        s_save_.imbue( a9_save_ );
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   371
        #endif
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        s_save_.fill( a8_save_ );
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   373
        s_save_.rdbuf( a7_save_ );
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   374
        s_save_.tie( a6_save_ );
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   375
        s_save_.exceptions( a5_save_ );
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   376
        s_save_.clear( a4_save_ );
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   377
        s_save_.width( a3_save_ );
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   378
        s_save_.precision( a2_save_ );
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   379
        s_save_.flags( a1_save_ );
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   380
    }
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   381
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   382
private:
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   383
    state_type &                            s_save_;
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   384
    typename state_type::fmtflags const     a1_save_;
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   385
    ::std::streamsize const                 a2_save_;
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   386
    ::std::streamsize const                 a3_save_;
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   387
    typename state_type::iostate const      a4_save_;
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   388
    typename state_type::iostate const      a5_save_;
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   389
    ::std::basic_ostream<Ch, Tr> * const    a6_save_;
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   390
    ::std::basic_streambuf<Ch, Tr> * const  a7_save_;
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   391
    typename state_type::char_type const    a8_save_;
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   392
    #ifndef BOOST_NO_STD_LOCALE
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   393
    ::std::locale const                     a9_save_;
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   394
    #endif
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   395
};
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   396
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   397
class ios_all_word_saver
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   398
{
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   399
public:
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   400
    typedef ::std::ios_base  state_type;
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   401
    typedef int              index_type;
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   402
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   403
    ios_all_word_saver( state_type &s, index_type i )
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   404
        : s_save_( s ), i_save_( i ), a1_save_( s.iword(i) )
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diff changeset
   405
        , a2_save_( s.pword(i) )
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   406
        {}
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   407
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   408
    ~ios_all_word_saver()
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diff changeset
   409
        { this->restore(); }
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   410
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   411
    void  restore()
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   412
    {
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   413
        s_save_.pword( i_save_ ) = a2_save_;
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   414
        s_save_.iword( i_save_ ) = a1_save_;
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diff changeset
   415
    }
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   416
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   417
private:
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   418
    state_type &      s_save_;
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   419
    index_type const  i_save_;
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   420
    long const        a1_save_;
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   421
    void * const      a2_save_;
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   422
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   423
    ios_all_word_saver& operator=(const ios_all_word_saver&);
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   424
};
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   425
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   426
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   427
}  // namespace io
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   428
}  // namespace boost
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   429
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   430
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   431
#endif  // BOOST_IO_IOS_STATE_HPP