440 lines
12 KiB
Plaintext
440 lines
12 KiB
Plaintext
// 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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basic_ios_iostate_saver& operator=(const basic_ios_iostate_saver&);
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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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basic_ios_exception_saver& operator=(const basic_ios_exception_saver&);
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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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basic_ios_tie_saver& operator=(const basic_ios_tie_saver&);
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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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basic_ios_rdbuf_saver& operator=(const basic_ios_rdbuf_saver&);
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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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basic_ios_fill_saver& operator=(const basic_ios_fill_saver&);
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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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basic_ios_locale_saver& operator=(const basic_ios_locale_saver&);
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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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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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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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#endif
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{}
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~basic_ios_all_saver()
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{ this->restore(); }
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void restore()
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{
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#ifndef BOOST_NO_STD_LOCALE
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s_save_.imbue( a9_save_ );
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#endif
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s_save_.fill( a8_save_ );
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s_save_.rdbuf( a7_save_ );
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s_save_.tie( a6_save_ );
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s_save_.exceptions( a5_save_ );
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s_save_.clear( a4_save_ );
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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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typename 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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typename state_type::iostate const a4_save_;
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typename state_type::iostate const a5_save_;
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::std::basic_ostream<Ch, Tr> * const a6_save_;
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::std::basic_streambuf<Ch, Tr> * const a7_save_;
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typename state_type::char_type const a8_save_;
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#ifndef BOOST_NO_STD_LOCALE
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::std::locale const a9_save_;
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#endif
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basic_ios_all_saver& operator=(const basic_ios_all_saver&);
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};
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class ios_all_word_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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ios_all_word_saver( state_type &s, index_type i )
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: s_save_( s ), i_save_( i ), a1_save_( s.iword(i) )
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, a2_save_( s.pword(i) )
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{}
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~ios_all_word_saver()
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{ this->restore(); }
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void restore()
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{
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s_save_.pword( i_save_ ) = a2_save_;
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s_save_.iword( i_save_ ) = a1_save_;
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}
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private:
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state_type & s_save_;
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index_type const i_save_;
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long const a1_save_;
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void * const a2_save_;
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ios_all_word_saver& operator=(const ios_all_word_saver&);
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};
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} // namespace io
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} // namespace boost
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#endif // BOOST_IO_IOS_STATE_HPP
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