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  1. //  Boost io/ios_state.hpp header file  --------------------------------------//
  2.  
  3. //  Copyright 2002, 2005 Daryle Walker.  Use, modification, and distribution
  4. //  are subject to the Boost Software License, Version 1.0.  (See accompanying
  5. //  file LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
  6.  
  7. //  See <http://www.boost.org/libs/io/> for the library's home page.
  8.  
  9. #ifndef BOOST_IO_IOS_STATE_HPP
  10. #define BOOST_IO_IOS_STATE_HPP
  11.  
  12. #include <boost/io_fwd.hpp>  // self include
  13. #include <boost/detail/workaround.hpp>
  14.  
  15. #include <ios>        // for std::ios_base, std::basic_ios, etc.
  16. #ifndef BOOST_NO_STD_LOCALE
  17. #include <locale>     // for std::locale
  18. #endif
  19. #include <ostream>    // for std::basic_ostream
  20. #include <streambuf>  // for std::basic_streambuf
  21. #include <string>     // for std::char_traits
  22.  
  23.  
  24. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost
  25. {
  26. namespace io
  27. {
  28.  
  29.  
  30. //  Basic stream state saver class declarations  -----------------------------//
  31.  
  32. class ios_flags_saver
  33. {
  34. public:
  35.     typedef ::std::ios_base            state_type;
  36.     typedef ::std::ios_base::fmtflags  aspect_type;
  37.  
  38.     explicit  ios_flags_saver( state_type &s )
  39.         : s_save_( s ), a_save_( s.flags() )
  40.         {}
  41.     ios_flags_saver( state_type &s, aspect_type const &a )
  42.         : s_save_( s ), a_save_( s.flags(a) )
  43.         {}
  44.     ~ios_flags_saver()
  45.         { this->restore(); }
  46.  
  47.     void  restore()
  48.         { s_save_.flags( a_save_ ); }
  49.  
  50. private:
  51.     state_type &       s_save_;
  52.     aspect_type const  a_save_;
  53.  
  54.     ios_flags_saver& operator=(const ios_flags_saver&);
  55. };
  56.  
  57. class ios_precision_saver
  58. {
  59. public:
  60.     typedef ::std::ios_base    state_type;
  61.     typedef ::std::streamsize  aspect_type;
  62.  
  63.     explicit  ios_precision_saver( state_type &s )
  64.         : s_save_( s ), a_save_( s.precision() )
  65.         {}
  66.     ios_precision_saver( state_type &s, aspect_type const &a )
  67.         : s_save_( s ), a_save_( s.precision(a) )
  68.         {}
  69.     ~ios_precision_saver()
  70.         { this->restore(); }
  71.  
  72.     void  restore()
  73.         { s_save_.precision( a_save_ ); }
  74.  
  75. private:
  76.     state_type &       s_save_;
  77.     aspect_type const  a_save_;
  78.  
  79.     ios_precision_saver& operator=(const ios_precision_saver&);
  80. };
  81.  
  82. class ios_width_saver
  83. {
  84. public:
  85.     typedef ::std::ios_base    state_type;
  86.     typedef ::std::streamsize  aspect_type;
  87.  
  88.     explicit  ios_width_saver( state_type &s )
  89.         : s_save_( s ), a_save_( s.width() )
  90.         {}
  91.     ios_width_saver( state_type &s, aspect_type const &a )
  92.         : s_save_( s ), a_save_( s.width(a) )
  93.         {}
  94.     ~ios_width_saver()
  95.         { this->restore(); }
  96.  
  97.     void  restore()
  98.         { s_save_.width( a_save_ ); }
  99.  
  100. private:
  101.     state_type &       s_save_;
  102.     aspect_type const  a_save_;
  103.     ios_width_saver& operator=(const ios_width_saver&);
  104. };
  105.  
  106.  
  107. //  Advanced stream state saver class template declarations  -----------------//
  108.  
  109. template < typename Ch, class Tr >
  110. class basic_ios_iostate_saver
  111. {
  112. public:
  113.     typedef ::std::basic_ios<Ch, Tr>  state_type;
  114.     typedef ::std::ios_base::iostate  aspect_type;
  115.  
  116.     explicit  basic_ios_iostate_saver( state_type &s )
  117.         : s_save_( s ), a_save_( s.rdstate() )
  118.         {}
  119.     basic_ios_iostate_saver( state_type &s, aspect_type const &a )
  120.         : s_save_( s ), a_save_( s.rdstate() )
  121.         { s.clear(a); }
  122.     ~basic_ios_iostate_saver()
  123.         { this->restore(); }
  124.  
  125.     void  restore()
  126.         { s_save_.clear( a_save_ ); }
  127.  
  128. private:
  129.     state_type &       s_save_;
  130.     aspect_type const  a_save_;
  131.     basic_ios_iostate_saver& operator=(const basic_ios_iostate_saver&);
  132. };
  133.  
  134. template < typename Ch, class Tr >
  135. class basic_ios_exception_saver
  136. {
  137. public:
  138.     typedef ::std::basic_ios<Ch, Tr>  state_type;
  139.     typedef ::std::ios_base::iostate  aspect_type;
  140.  
  141.     explicit  basic_ios_exception_saver( state_type &s )
  142.         : s_save_( s ), a_save_( s.exceptions() )
  143.         {}
  144. #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
  145.     basic_ios_exception_saver( state_type &s, aspect_type a )
  146. #else
  147.     basic_ios_exception_saver( state_type &s, aspect_type const &a )
  148. #endif
  149.         : s_save_( s ), a_save_( s.exceptions() )
  150.         { s.exceptions(a); }
  151.     ~basic_ios_exception_saver()
  152.         { this->restore(); }
  153.  
  154.     void  restore()
  155.         { s_save_.exceptions( a_save_ ); }
  156.  
  157. private:
  158.     state_type &       s_save_;
  159.     aspect_type const  a_save_;
  160.     basic_ios_exception_saver& operator=(const basic_ios_exception_saver&);
  161. };
  162.  
  163. template < typename Ch, class Tr >
  164. class basic_ios_tie_saver
  165. {
  166. public:
  167.     typedef ::std::basic_ios<Ch, Tr>        state_type;
  168.     typedef ::std::basic_ostream<Ch, Tr> *  aspect_type;
  169.  
  170.     explicit  basic_ios_tie_saver( state_type &s )
  171.         : s_save_( s ), a_save_( s.tie() )
  172.         {}
  173.     basic_ios_tie_saver( state_type &s, aspect_type const &a )
  174.         : s_save_( s ), a_save_( s.tie(a) )
  175.         {}
  176.     ~basic_ios_tie_saver()
  177.         { this->restore(); }
  178.  
  179.     void  restore()
  180.         { s_save_.tie( a_save_ ); }
  181.  
  182. private:
  183.     state_type &       s_save_;
  184.     aspect_type const  a_save_;
  185.     basic_ios_tie_saver& operator=(const basic_ios_tie_saver&);
  186. };
  187.  
  188. template < typename Ch, class Tr >
  189. class basic_ios_rdbuf_saver
  190. {
  191. public:
  192.     typedef ::std::basic_ios<Ch, Tr>          state_type;
  193.     typedef ::std::basic_streambuf<Ch, Tr> *  aspect_type;
  194.  
  195.     explicit  basic_ios_rdbuf_saver( state_type &s )
  196.         : s_save_( s ), a_save_( s.rdbuf() )
  197.         {}
  198.     basic_ios_rdbuf_saver( state_type &s, aspect_type const &a )
  199.         : s_save_( s ), a_save_( s.rdbuf(a) )
  200.         {}
  201.     ~basic_ios_rdbuf_saver()
  202.         { this->restore(); }
  203.  
  204.     void  restore()
  205.         { s_save_.rdbuf( a_save_ ); }
  206.  
  207. private:
  208.     state_type &       s_save_;
  209.     aspect_type const  a_save_;
  210.     basic_ios_rdbuf_saver& operator=(const basic_ios_rdbuf_saver&);
  211. };
  212.  
  213. template < typename Ch, class Tr >
  214. class basic_ios_fill_saver
  215. {
  216. public:
  217.     typedef ::std::basic_ios<Ch, Tr>        state_type;
  218.     typedef typename state_type::char_type  aspect_type;
  219.  
  220.     explicit  basic_ios_fill_saver( state_type &s )
  221.         : s_save_( s ), a_save_( s.fill() )
  222.         {}
  223.     basic_ios_fill_saver( state_type &s, aspect_type const &a )
  224.         : s_save_( s ), a_save_( s.fill(a) )
  225.         {}
  226.     ~basic_ios_fill_saver()
  227.         { this->restore(); }
  228.  
  229.     void  restore()
  230.         { s_save_.fill( a_save_ ); }
  231.  
  232. private:
  233.     state_type &       s_save_;
  234.     aspect_type const  a_save_;
  235.     basic_ios_fill_saver& operator=(const basic_ios_fill_saver&);
  236. };
  237.  
  238. #ifndef BOOST_NO_STD_LOCALE
  239. template < typename Ch, class Tr >
  240. class basic_ios_locale_saver
  241. {
  242. public:
  243.     typedef ::std::basic_ios<Ch, Tr> state_type;
  244.     typedef ::std::locale aspect_type;
  245.  
  246.     explicit basic_ios_locale_saver( state_type &s )
  247.         : s_save_( s ), a_save_( s.getloc() )
  248.         {}
  249.     basic_ios_locale_saver( state_type &s, aspect_type const &a )
  250.         : s_save_( s ), a_save_( s.imbue(a) )
  251.         {}
  252.     ~basic_ios_locale_saver()
  253.         { this->restore(); }
  254.  
  255.     void  restore()
  256.         { s_save_.imbue( a_save_ ); }
  257.  
  258. private:
  259.     state_type &       s_save_;
  260.     aspect_type const  a_save_;
  261.     basic_ios_locale_saver& operator=(const basic_ios_locale_saver&);
  262. };
  263. #endif
  264.  
  265.  
  266. //  User-defined stream state saver class declarations  ----------------------//
  267.  
  268. class ios_iword_saver
  269. {
  270. public:
  271.     typedef ::std::ios_base  state_type;
  272.     typedef int              index_type;
  273.     typedef long             aspect_type;
  274.  
  275.     explicit ios_iword_saver( state_type &s, index_type i )
  276.         : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )
  277.         {}
  278.     ios_iword_saver( state_type &s, index_type i, aspect_type const &a )
  279.         : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )
  280.         { s.iword(i) = a; }
  281.     ~ios_iword_saver()
  282.         { this->restore(); }
  283.  
  284.     void  restore()
  285.         { s_save_.iword( i_save_ ) = a_save_; }
  286.  
  287. private:
  288.     state_type &       s_save_;
  289.     aspect_type const  a_save_;
  290.     index_type const   i_save_;
  291.  
  292.     ios_iword_saver& operator=(const ios_iword_saver&);
  293. };
  294.  
  295. class ios_pword_saver
  296. {
  297. public:
  298.     typedef ::std::ios_base  state_type;
  299.     typedef int              index_type;
  300.     typedef void *           aspect_type;
  301.  
  302.     explicit  ios_pword_saver( state_type &s, index_type i )
  303.         : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )
  304.         {}
  305.     ios_pword_saver( state_type &s, index_type i, aspect_type const &a )
  306.         : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )
  307.         { s.pword(i) = a; }
  308.     ~ios_pword_saver()
  309.         { this->restore(); }
  310.  
  311.     void  restore()
  312.         { s_save_.pword( i_save_ ) = a_save_; }
  313.  
  314. private:
  315.     state_type &       s_save_;
  316.     aspect_type const  a_save_;
  317.     index_type const   i_save_;
  318.  
  319.     ios_pword_saver operator=(const ios_pword_saver&);
  320. };
  321.  
  322.  
  323. //  Combined stream state saver class (template) declarations  ---------------//
  324.  
  325. class ios_base_all_saver
  326. {
  327. public:
  328.     typedef ::std::ios_base  state_type;
  329.  
  330.     explicit  ios_base_all_saver( state_type &s )
  331.         : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )
  332.         , a3_save_( s.width() )
  333.         {}
  334.  
  335.     ~ios_base_all_saver()
  336.         { this->restore(); }
  337.  
  338.     void  restore()
  339.     {
  340.         s_save_.width( a3_save_ );
  341.         s_save_.precision( a2_save_ );
  342.         s_save_.flags( a1_save_ );
  343.     }
  344.  
  345. private:
  346.     state_type &                s_save_;
  347.     state_type::fmtflags const  a1_save_;
  348.     ::std::streamsize const     a2_save_;
  349.     ::std::streamsize const     a3_save_;
  350.  
  351.     ios_base_all_saver& operator=(const ios_base_all_saver&);
  352. };
  353.  
  354. template < typename Ch, class Tr >
  355. class basic_ios_all_saver
  356. {
  357. public:
  358.     typedef ::std::basic_ios<Ch, Tr>  state_type;
  359.  
  360.     explicit  basic_ios_all_saver( state_type &s )
  361.         : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )
  362.         , a3_save_( s.width() ), a4_save_( s.rdstate() )
  363.         , a5_save_( s.exceptions() ), a6_save_( s.tie() )
  364.         , a7_save_( s.rdbuf() ), a8_save_( s.fill() )
  365.         #ifndef BOOST_NO_STD_LOCALE
  366.         , a9_save_( s.getloc() )
  367.         #endif
  368.         {}
  369.  
  370.     ~basic_ios_all_saver()
  371.         { this->restore(); }
  372.  
  373.     void  restore()
  374.     {
  375.         #ifndef BOOST_NO_STD_LOCALE
  376.         s_save_.imbue( a9_save_ );
  377.         #endif
  378.         s_save_.fill( a8_save_ );
  379.         s_save_.rdbuf( a7_save_ );
  380.         s_save_.tie( a6_save_ );
  381.         s_save_.exceptions( a5_save_ );
  382.         s_save_.clear( a4_save_ );
  383.         s_save_.width( a3_save_ );
  384.         s_save_.precision( a2_save_ );
  385.         s_save_.flags( a1_save_ );
  386.     }
  387.  
  388. private:
  389.     state_type &                            s_save_;
  390.     typename state_type::fmtflags const     a1_save_;
  391.     ::std::streamsize const                 a2_save_;
  392.     ::std::streamsize const                 a3_save_;
  393.     typename state_type::iostate const      a4_save_;
  394.     typename state_type::iostate const      a5_save_;
  395.     ::std::basic_ostream<Ch, Tr> * const    a6_save_;
  396.     ::std::basic_streambuf<Ch, Tr> * const  a7_save_;
  397.     typename state_type::char_type const    a8_save_;
  398.     #ifndef BOOST_NO_STD_LOCALE
  399.     ::std::locale const                     a9_save_;
  400.     #endif
  401.  
  402.     basic_ios_all_saver& operator=(const basic_ios_all_saver&);
  403. };
  404.  
  405. class ios_all_word_saver
  406. {
  407. public:
  408.     typedef ::std::ios_base  state_type;
  409.     typedef int              index_type;
  410.  
  411.     ios_all_word_saver( state_type &s, index_type i )
  412.         : s_save_( s ), i_save_( i ), a1_save_( s.iword(i) )
  413.         , a2_save_( s.pword(i) )
  414.         {}
  415.  
  416.     ~ios_all_word_saver()
  417.         { this->restore(); }
  418.  
  419.     void  restore()
  420.     {
  421.         s_save_.pword( i_save_ ) = a2_save_;
  422.         s_save_.iword( i_save_ ) = a1_save_;
  423.     }
  424.  
  425. private:
  426.     state_type &      s_save_;
  427.     index_type const  i_save_;
  428.     long const        a1_save_;
  429.     void * const      a2_save_;
  430.  
  431.     ios_all_word_saver& operator=(const ios_all_word_saver&);
  432. };
  433.  
  434.  
  435. }  // namespace io
  436. }  // namespace mars_boost
  437.  
  438.  
  439. #endif  // BOOST_IO_IOS_STATE_HPP
  440.  
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