// 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_; basic_ios_iostate_saver& operator=(const basic_ios_iostate_saver&); }; 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_; basic_ios_exception_saver& operator=(const basic_ios_exception_saver&); }; 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_; basic_ios_tie_saver& operator=(const basic_ios_tie_saver&); }; 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_; basic_ios_rdbuf_saver& operator=(const basic_ios_rdbuf_saver&); }; 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_; basic_ios_fill_saver& operator=(const basic_ios_fill_saver&); }; #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_; basic_ios_locale_saver& operator=(const basic_ios_locale_saver&); }; #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 basic_ios_all_saver& operator=(const basic_ios_all_saver&); }; 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