iomanip

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00001 // Standard stream manipulators -*- C++ -*-
00002 
00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
00004 // 2006, 2007, 2009
00005 // Free Software Foundation, Inc.
00006 //
00007 // This file is part of the GNU ISO C++ Library.  This library is free
00008 // software; you can redistribute it and/or modify it under the
00009 // terms of the GNU General Public License as published by the
00010 // Free Software Foundation; either version 3, or (at your option)
00011 // any later version.
00012 
00013 // This library is distributed in the hope that it will be useful,
00014 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00015 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016 // GNU General Public License for more details.
00017 
00018 // Under Section 7 of GPL version 3, you are granted additional
00019 // permissions described in the GCC Runtime Library Exception, version
00020 // 3.1, as published by the Free Software Foundation.
00021 
00022 // You should have received a copy of the GNU General Public License and
00023 // a copy of the GCC Runtime Library Exception along with this program;
00024 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00025 // <http://www.gnu.org/licenses/>.
00026 
00027 /** @file iomanip
00028  *  This is a Standard C++ Library header.
00029  */
00030 
00031 //
00032 // ISO C++ 14882: 27.6.3  Standard manipulators
00033 //
00034 
00035 #ifndef _GLIBCXX_IOMANIP
00036 #define _GLIBCXX_IOMANIP 1
00037 
00038 #pragma GCC system_header
00039 
00040 #include <bits/c++config.h>
00041 #include <iosfwd>
00042 #include <bits/ios_base.h>
00043 
00044 _GLIBCXX_BEGIN_NAMESPACE(std)
00045 
00046   // [27.6.3] standard manipulators
00047   // Also see DR 183.
00048 
00049   struct _Resetiosflags { ios_base::fmtflags _M_mask; };
00050 
00051   /**
00052    *  @brief  Manipulator for @c setf.
00053    *  @param  mask  A format flags mask.
00054    *
00055    *  Sent to a stream object, this manipulator resets the specified flags,
00056    *  via @e stream.setf(0,mask).
00057   */
00058   inline _Resetiosflags 
00059   resetiosflags(ios_base::fmtflags __mask)
00060   { 
00061     _Resetiosflags __x; 
00062     __x._M_mask = __mask; 
00063     return __x; 
00064   }
00065 
00066   template<typename _CharT, typename _Traits>
00067     inline basic_istream<_CharT, _Traits>& 
00068     operator>>(basic_istream<_CharT, _Traits>& __is, _Resetiosflags __f)
00069     { 
00070       __is.setf(ios_base::fmtflags(0), __f._M_mask); 
00071       return __is; 
00072     }
00073 
00074   template<typename _CharT, typename _Traits>
00075     inline basic_ostream<_CharT, _Traits>& 
00076     operator<<(basic_ostream<_CharT, _Traits>& __os, _Resetiosflags __f)
00077     { 
00078       __os.setf(ios_base::fmtflags(0), __f._M_mask); 
00079       return __os; 
00080     }
00081 
00082 
00083   struct _Setiosflags { ios_base::fmtflags _M_mask; };
00084 
00085   /**
00086    *  @brief  Manipulator for @c setf.
00087    *  @param  mask  A format flags mask.
00088    *
00089    *  Sent to a stream object, this manipulator sets the format flags
00090    *  to @a mask.
00091   */
00092   inline _Setiosflags 
00093   setiosflags(ios_base::fmtflags __mask)
00094   { 
00095     _Setiosflags __x; 
00096     __x._M_mask = __mask; 
00097     return __x; 
00098   }
00099 
00100   template<typename _CharT, typename _Traits>
00101     inline basic_istream<_CharT, _Traits>& 
00102     operator>>(basic_istream<_CharT, _Traits>& __is, _Setiosflags __f)
00103     { 
00104       __is.setf(__f._M_mask); 
00105       return __is; 
00106     }
00107 
00108   template<typename _CharT, typename _Traits>
00109     inline basic_ostream<_CharT, _Traits>& 
00110     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f)
00111     { 
00112       __os.setf(__f._M_mask); 
00113       return __os; 
00114     }
00115 
00116 
00117   struct _Setbase { int _M_base; };
00118 
00119   /**
00120    *  @brief  Manipulator for @c setf.
00121    *  @param  base  A numeric base.
00122    *
00123    *  Sent to a stream object, this manipulator changes the
00124    *  @c ios_base::basefield flags to @c oct, @c dec, or @c hex when @a base
00125    *  is 8, 10, or 16, accordingly, and to 0 if @a base is any other value.
00126   */
00127   inline _Setbase 
00128   setbase(int __base)
00129   { 
00130     _Setbase __x; 
00131     __x._M_base = __base; 
00132     return __x; 
00133   }
00134 
00135   template<typename _CharT, typename _Traits>
00136     inline basic_istream<_CharT, _Traits>& 
00137     operator>>(basic_istream<_CharT, _Traits>& __is, _Setbase __f)
00138     {
00139       __is.setf(__f._M_base ==  8 ? ios_base::oct : 
00140         __f._M_base == 10 ? ios_base::dec : 
00141         __f._M_base == 16 ? ios_base::hex : 
00142         ios_base::fmtflags(0), ios_base::basefield);
00143       return __is; 
00144     }
00145   
00146   template<typename _CharT, typename _Traits>
00147     inline basic_ostream<_CharT, _Traits>& 
00148     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f)
00149     {
00150       __os.setf(__f._M_base ==  8 ? ios_base::oct : 
00151         __f._M_base == 10 ? ios_base::dec : 
00152         __f._M_base == 16 ? ios_base::hex : 
00153         ios_base::fmtflags(0), ios_base::basefield);
00154       return __os; 
00155     }
00156   
00157 
00158   template<typename _CharT> 
00159     struct _Setfill { _CharT _M_c; };
00160 
00161   /**
00162    *  @brief  Manipulator for @c fill.
00163    *  @param  c  The new fill character.
00164    *
00165    *  Sent to a stream object, this manipulator calls @c fill(c) for that
00166    *  object.
00167   */
00168   template<typename _CharT> 
00169     inline _Setfill<_CharT> 
00170     setfill(_CharT __c)
00171     { 
00172       _Setfill<_CharT> __x; 
00173       __x._M_c = __c; 
00174       return __x; 
00175     }
00176 
00177   template<typename _CharT, typename _Traits>
00178     inline basic_istream<_CharT, _Traits>& 
00179     operator>>(basic_istream<_CharT, _Traits>& __is, _Setfill<_CharT> __f)
00180     { 
00181       __is.fill(__f._M_c); 
00182       return __is; 
00183     }
00184 
00185   template<typename _CharT, typename _Traits>
00186     inline basic_ostream<_CharT, _Traits>& 
00187     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f)
00188     { 
00189       __os.fill(__f._M_c); 
00190       return __os; 
00191     }
00192 
00193 
00194   struct _Setprecision { int _M_n; };
00195 
00196   /**
00197    *  @brief  Manipulator for @c precision.
00198    *  @param  n  The new precision.
00199    *
00200    *  Sent to a stream object, this manipulator calls @c precision(n) for
00201    *  that object.
00202   */
00203   inline _Setprecision 
00204   setprecision(int __n)
00205   { 
00206     _Setprecision __x; 
00207     __x._M_n = __n; 
00208     return __x; 
00209   }
00210 
00211   template<typename _CharT, typename _Traits>
00212     inline basic_istream<_CharT, _Traits>& 
00213     operator>>(basic_istream<_CharT, _Traits>& __is, _Setprecision __f)
00214     { 
00215       __is.precision(__f._M_n); 
00216       return __is; 
00217     }
00218 
00219   template<typename _CharT, typename _Traits>
00220     inline basic_ostream<_CharT, _Traits>& 
00221     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f)
00222     { 
00223       __os.precision(__f._M_n); 
00224       return __os; 
00225     }
00226 
00227 
00228   struct _Setw { int _M_n; };
00229 
00230   /**
00231    *  @brief  Manipulator for @c width.
00232    *  @param  n  The new width.
00233    *
00234    *  Sent to a stream object, this manipulator calls @c width(n) for
00235    *  that object.
00236   */
00237   inline _Setw 
00238   setw(int __n)
00239   { 
00240     _Setw __x; 
00241     __x._M_n = __n; 
00242     return __x; 
00243   }
00244 
00245   template<typename _CharT, typename _Traits>
00246     inline basic_istream<_CharT, _Traits>& 
00247     operator>>(basic_istream<_CharT, _Traits>& __is, _Setw __f)
00248     { 
00249       __is.width(__f._M_n); 
00250       return __is; 
00251     }
00252 
00253   template<typename _CharT, typename _Traits>
00254     inline basic_ostream<_CharT, _Traits>& 
00255     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setw __f)
00256     { 
00257       __os.width(__f._M_n); 
00258       return __os; 
00259     }
00260 
00261   // Inhibit implicit instantiations for required instantiations,
00262   // which are defined via explicit instantiations elsewhere.  
00263   // NB:  This syntax is a GNU extension.
00264 #if _GLIBCXX_EXTERN_TEMPLATE
00265   extern template ostream& operator<<(ostream&, _Setfill<char>);
00266   extern template ostream& operator<<(ostream&, _Setiosflags);
00267   extern template ostream& operator<<(ostream&, _Resetiosflags);
00268   extern template ostream& operator<<(ostream&, _Setbase);
00269   extern template ostream& operator<<(ostream&, _Setprecision);
00270   extern template ostream& operator<<(ostream&, _Setw);
00271   extern template istream& operator>>(istream&, _Setfill<char>);
00272   extern template istream& operator>>(istream&, _Setiosflags);
00273   extern template istream& operator>>(istream&, _Resetiosflags);
00274   extern template istream& operator>>(istream&, _Setbase);
00275   extern template istream& operator>>(istream&, _Setprecision);
00276   extern template istream& operator>>(istream&, _Setw);
00277 
00278 #ifdef _GLIBCXX_USE_WCHAR_T
00279   extern template wostream& operator<<(wostream&, _Setfill<wchar_t>);
00280   extern template wostream& operator<<(wostream&, _Setiosflags);
00281   extern template wostream& operator<<(wostream&, _Resetiosflags);
00282   extern template wostream& operator<<(wostream&, _Setbase);
00283   extern template wostream& operator<<(wostream&, _Setprecision);
00284   extern template wostream& operator<<(wostream&, _Setw);
00285   extern template wistream& operator>>(wistream&, _Setfill<wchar_t>);
00286   extern template wistream& operator>>(wistream&, _Setiosflags);
00287   extern template wistream& operator>>(wistream&, _Resetiosflags);
00288   extern template wistream& operator>>(wistream&, _Setbase);
00289   extern template wistream& operator>>(wistream&, _Setprecision);
00290   extern template wistream& operator>>(wistream&, _Setw);
00291 #endif
00292 #endif
00293 
00294 _GLIBCXX_END_NAMESPACE
00295 
00296 #endif /* _GLIBCXX_IOMANIP */

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