# iomanip

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    00001 // Standard stream manipulators -*- C++ -*-
    00002
    00003 // Copyright (C) 1997, 1998, 1999, 2001, 2002, 2003
    00004 // Free Software Foundation, Inc.
    00005 //
    00006 // This file is part of the GNU ISO C++ Library.  This library is free
    00007 // software; you can redistribute it and/or modify it under the
    00008 // terms of the GNU General Public License as published by the
    00009 // Free Software Foundation; either version 2, or (at your option)
    00010 // any later version.
    00011
    00012 // This library is distributed in the hope that it will be useful,
    00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015 // GNU General Public License for more details.
    00016
    00017 // You should have received a copy of the GNU General Public License along
    00018 // with this library; see the file COPYING.  If not, write to the Free
    00019 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
    00020 // USA.
    00021
    00022 // As a special exception, you may use this file as part of a free software
    00023 // library without restriction.  Specifically, if other files instantiate
    00024 // templates or use macros or inline functions from this file, or you compile
    00025 // this file and link it with other files to produce an executable, this
    00026 // file does not by itself cause the resulting executable to be covered by
    00027 // the GNU General Public License.  This exception does not however
    00028 // invalidate any other reasons why the executable file might be covered by
    00029 // the GNU General Public License.
    00030
    00031 //
    00032 // ISO C++ 14882: 27.6.3  Standard manipulators
    00033 //
    00034
    00035 /** @file iomanip
    00036  *  This is a Standard C++ Library header.  You should @c #include this header
    00037  *  in your programs, rather than any of the "st[dl]_*.h" implementation files.
    00038  */
    00039
    00040 #ifndef _GLIBCXX_IOMANIP
    00041 #define _GLIBCXX_IOMANIP 1
    00042
    00043 #pragma GCC system_header
    00044
    00045 #include <bits/c++config.h>
    00046 #include <istream>
    00047 #include <functional>
    00048
    00049 namespace std
    00050 {
    00051   // [27.6.3] standard manipulators
    00052   // Also see DR 183.
    00053
    00054   struct _Resetiosflags { ios_base::fmtflags _M_mask; };
    00055
    00056   /**
    00057    *  @brief  Manipulator for @c setf.
    00058    *  @param  mask  A format flags mask.
    00059    *
    00060    *  Sent to a stream object, this manipulator resets the specified flags,
    00061    *  via @e stream.setf(0,mask).
    00062   */
    00063   inline _Resetiosflags
    00064   resetiosflags(ios_base::fmtflags __mask)
    00065   {
    00066     _Resetiosflags __x;
    00067     __x._M_mask = __mask;
    00068     return __x;
    00069   }
    00070
    00071   template<typename _CharT, typename _Traits>
    00072     inline basic_istream<_CharT,_Traits>&
    00073     operator>>(basic_istream<_CharT,_Traits>& __is, _Resetiosflags __f)
    00074     {
    00075       __is.setf(ios_base::fmtflags(0), __f._M_mask);
    00076       return __is;
    00077     }
    00078
    00079   template<typename _CharT, typename _Traits>
    00080     inline basic_ostream<_CharT,_Traits>&
    00081     operator<<(basic_ostream<_CharT,_Traits>& __os, _Resetiosflags __f)
    00082     {
    00083       __os.setf(ios_base::fmtflags(0), __f._M_mask);
    00084       return __os;
    00085     }
    00086
    00087
    00088   struct _Setiosflags { ios_base::fmtflags _M_mask; };
    00089
    00090   /**
    00091    *  @brief  Manipulator for @c setf.
    00092    *  @param  mask  A format flags mask.
    00093    *
    00094    *  Sent to a stream object, this manipulator sets the format flags
    00095    *  to @a mask.
    00096   */
    00097   inline _Setiosflags
    00098   setiosflags(ios_base::fmtflags __mask)
    00099   {
    00100     _Setiosflags __x;
    00101     __x._M_mask = __mask;
    00102     return __x;
    00103   }
    00104
    00105   template<typename _CharT, typename _Traits>
    00106     inline basic_istream<_CharT,_Traits>&
    00107     operator>>(basic_istream<_CharT,_Traits>& __is, _Setiosflags __f)
    00108     {
    00109       __is.setf(__f._M_mask);
    00110       return __is;
    00111     }
    00112
    00113   template<typename _CharT, typename _Traits>
    00114     inline basic_ostream<_CharT,_Traits>&
    00115     operator<<(basic_ostream<_CharT,_Traits>& __os, _Setiosflags __f)
    00116     {
    00117       __os.setf(__f._M_mask);
    00118       return __os;
    00119     }
    00120
    00121
    00122   struct _Setbase { int _M_base; };
    00123
    00124   /**
    00125    *  @brief  Manipulator for @c setf.
    00126    *  @param  base  A numeric base.
    00127    *
    00128    *  Sent to a stream object, this manipulator changes the
    00129    *  @c ios_base::basefield flags to @c oct, @c dec, or @c hex when @a base
    00130    *  is 8, 10, or 16, accordingly, and to 0 if @a base is any other value.
    00131   */
    00132   inline _Setbase
    00133   setbase(int __base)
    00134   {
    00135     _Setbase __x;
    00136     __x._M_base = __base;
    00137     return __x;
    00138   }
    00139
    00140   template<typename _CharT, typename _Traits>
    00141     inline basic_istream<_CharT,_Traits>&
    00142     operator>>(basic_istream<_CharT,_Traits>& __is, _Setbase __f)
    00143     {
    00144       __is.setf(__f._M_base ==  8 ? ios_base::oct :
    00145           __f._M_base == 10 ? ios_base::dec :
    00146           __f._M_base == 16 ? ios_base::hex :
    00147           ios_base::fmtflags(0), ios_base::basefield);
    00148       return __is;
    00149     }
    00150
    00151   template<typename _CharT, typename _Traits>
    00152     inline basic_ostream<_CharT,_Traits>&
    00153     operator<<(basic_ostream<_CharT,_Traits>& __os, _Setbase __f)
    00154     {
    00155       __os.setf(__f._M_base ==  8 ? ios_base::oct :
    00156         __f._M_base == 10 ? ios_base::dec :
    00157         __f._M_base == 16 ? ios_base::hex :
    00158         ios_base::fmtflags(0), ios_base::basefield);
    00159       return __os;
    00160     }
    00161
    00162
    00163   template<typename _CharT>
    00164     struct _Setfill { _CharT _M_c; };
    00165
    00166   /**
    00167    *  @brief  Manipulator for @c fill.
    00168    *  @param  c  The new fill character.
    00169    *
    00170    *  Sent to a stream object, this manipulator calls @c fill(c) for that
    00171    *  object.
    00172   */
    00173   template<typename _CharT>
    00174     inline _Setfill<_CharT>
    00175     setfill(_CharT __c)
    00176     {
    00177       _Setfill<_CharT> __x;
    00178       __x._M_c = __c;
    00179       return __x;
    00180     }
    00181
    00182   template<typename _CharT, typename _Traits>
    00183     inline basic_istream<_CharT,_Traits>&
    00184     operator>>(basic_istream<_CharT,_Traits>& __is, _Setfill<_CharT> __f)
    00185     {
    00186       __is.fill(__f._M_c);
    00187       return __is;
    00188     }
    00189
    00190   template<typename _CharT, typename _Traits>
    00191     inline basic_ostream<_CharT,_Traits>&
    00192     operator<<(basic_ostream<_CharT,_Traits>& __os, _Setfill<_CharT> __f)
    00193     {
    00194       __os.fill(__f._M_c);
    00195       return __os;
    00196     }
    00197
    00198
    00199   struct _Setprecision { int _M_n; };
    00200
    00201   /**
    00202    *  @brief  Manipulator for @c precision.
    00203    *  @param  n  The new precision.
    00204    *
    00205    *  Sent to a stream object, this manipulator calls @c precision(n) for
    00206    *  that object.
    00207   */
    00208   inline _Setprecision
    00209   setprecision(int __n)
    00210   {
    00211     _Setprecision __x;
    00212     __x._M_n = __n;
    00213     return __x;
    00214   }
    00215
    00216   template<typename _CharT, typename _Traits>
    00217     inline basic_istream<_CharT,_Traits>&
    00218     operator>>(basic_istream<_CharT,_Traits>& __is, _Setprecision __f)
    00219     {
    00220       __is.precision(__f._M_n);
    00221       return __is;
    00222     }
    00223
    00224   template<typename _CharT, typename _Traits>
    00225     inline basic_ostream<_CharT,_Traits>&
    00226     operator<<(basic_ostream<_CharT,_Traits>& __os, _Setprecision __f)
    00227     {
    00228       __os.precision(__f._M_n);
    00229       return __os;
    00230     }
    00231
    00232
    00233   struct _Setw { int _M_n; };
    00234
    00235   /**
    00236    *  @brief  Manipulator for @c width.
    00237    *  @param  n  The new width.
    00238    *
    00239    *  Sent to a stream object, this manipulator calls @c width(n) for
    00240    *  that object.
    00241   */
    00242   inline _Setw
    00243   setw(int __n)
    00244   {
    00245     _Setw __x;
    00246     __x._M_n = __n;
    00247     return __x;
    00248   }
    00249
    00250   template<typename _CharT, typename _Traits>
    00251     inline basic_istream<_CharT,_Traits>&
    00252     operator>>(basic_istream<_CharT,_Traits>& __is, _Setw __f)
    00253     {
    00254       __is.width(__f._M_n);
    00255       return __is;
    00256     }
    00257
    00258   template<typename _CharT, typename _Traits>
    00259     inline basic_ostream<_CharT,_Traits>&
    00260     operator<<(basic_ostream<_CharT,_Traits>& __os, _Setw __f)
    00261     {
    00262       __os.width(__f._M_n);
    00263       return __os;
    00264     }
    00265
    00266   // Inhibit implicit instantiations for required instantiations,
    00267   // which are defined via explicit instantiations elsewhere.
    00268   // NB:  This syntax is a GNU extension.
    00269 #if _GLIBCXX_EXTERN_TEMPLATE
    00270   extern template ostream& operator<<(ostream&, _Setfill<char>);
    00271   extern template ostream& operator<<(ostream&, _Setiosflags);
    00272   extern template ostream& operator<<(ostream&, _Resetiosflags);
    00273   extern template ostream& operator<<(ostream&, _Setbase);
    00274   extern template ostream& operator<<(ostream&, _Setprecision);
    00275   extern template ostream& operator<<(ostream&, _Setw);
    00276   extern template istream& operator>>(istream&, _Setfill<char>);
    00277   extern template istream& operator>>(istream&, _Setiosflags);
    00278   extern template istream& operator>>(istream&, _Resetiosflags);
    00279   extern template istream& operator>>(istream&, _Setbase);
    00280   extern template istream& operator>>(istream&, _Setprecision);
    00281   extern template istream& operator>>(istream&, _Setw);
    00282
    00283 #ifdef _GLIBCXX_USE_WCHAR_T
    00284   extern template wostream& operator<<(wostream&, _Setfill<wchar_t>);
    00285   extern template wostream& operator<<(wostream&, _Setiosflags);
    00286   extern template wostream& operator<<(wostream&, _Resetiosflags);
    00287   extern template wostream& operator<<(wostream&, _Setbase);
    00288   extern template wostream& operator<<(wostream&, _Setprecision);
    00289   extern template wostream& operator<<(wostream&, _Setw);
    00290   extern template wistream& operator>>(wistream&, _Setfill<wchar_t>);
    00291   extern template wistream& operator>>(wistream&, _Setiosflags);
    00292   extern template wistream& operator>>(wistream&, _Resetiosflags);
    00293   extern template wistream& operator>>(wistream&, _Setbase);
    00294   extern template wistream& operator>>(wistream&, _Setprecision);
    00295   extern template wistream& operator>>(wistream&, _Setw);
    00296 #endif
    00297 #endif
    00298 } // namespace std
    00299
    00300 #endif /* _GLIBCXX_IOMANIP */