# iomanip

Go to the documentation of this file.

    00001 // Standard stream manipulators -*- C++ -*-
    00002
    00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
    00004 // 2006, 2007, 2008, 2009, 2010
    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 #ifdef __GXX_EXPERIMENTAL_CXX0X__
    00045 #include <locale>
    00046 #endif
    00047
    00048 _GLIBCXX_BEGIN_NAMESPACE(std)
    00049
    00050   // [27.6.3] standard manipulators
    00051   // Also see DR 183.
    00052
    00053   struct _Resetiosflags { ios_base::fmtflags _M_mask; };
    00054
    00055   /**
    00056    *  @brief  Manipulator for @c setf.
    00057    *  @param  mask  A format flags mask.
    00058    *
    00059    *  Sent to a stream object, this manipulator resets the specified flags,
    00060    *  via @e stream.setf(0,mask).
    00061   */
    00062   inline _Resetiosflags
    00063   resetiosflags(ios_base::fmtflags __mask)
    00064   { return { __mask }; }
    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   { return { __mask }; }
    00095
    00096   template<typename _CharT, typename _Traits>
    00097     inline basic_istream<_CharT, _Traits>&
    00098     operator>>(basic_istream<_CharT, _Traits>& __is, _Setiosflags __f)
    00099     {
    00100       __is.setf(__f._M_mask);
    00101       return __is;
    00102     }
    00103
    00104   template<typename _CharT, typename _Traits>
    00105     inline basic_ostream<_CharT, _Traits>&
    00106     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f)
    00107     {
    00108       __os.setf(__f._M_mask);
    00109       return __os;
    00110     }
    00111
    00112
    00113   struct _Setbase { int _M_base; };
    00114
    00115   /**
    00116    *  @brief  Manipulator for @c setf.
    00117    *  @param  base  A numeric base.
    00118    *
    00119    *  Sent to a stream object, this manipulator changes the
    00120    *  @c ios_base::basefield flags to @c oct, @c dec, or @c hex when @a base
    00121    *  is 8, 10, or 16, accordingly, and to 0 if @a base is any other value.
    00122   */
    00123   inline _Setbase
    00124   setbase(int __base)
    00125   { return { __base }; }
    00126
    00127   template<typename _CharT, typename _Traits>
    00128     inline basic_istream<_CharT, _Traits>&
    00129     operator>>(basic_istream<_CharT, _Traits>& __is, _Setbase __f)
    00130     {
    00131       __is.setf(__f._M_base ==  8 ? ios_base::oct :
    00132         __f._M_base == 10 ? ios_base::dec :
    00133         __f._M_base == 16 ? ios_base::hex :
    00134         ios_base::fmtflags(0), ios_base::basefield);
    00135       return __is;
    00136     }
    00137
    00138   template<typename _CharT, typename _Traits>
    00139     inline basic_ostream<_CharT, _Traits>&
    00140     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f)
    00141     {
    00142       __os.setf(__f._M_base ==  8 ? ios_base::oct :
    00143         __f._M_base == 10 ? ios_base::dec :
    00144         __f._M_base == 16 ? ios_base::hex :
    00145         ios_base::fmtflags(0), ios_base::basefield);
    00146       return __os;
    00147     }
    00148
    00149
    00150   template<typename _CharT>
    00151     struct _Setfill { _CharT _M_c; };
    00152
    00153   /**
    00154    *  @brief  Manipulator for @c fill.
    00155    *  @param  c  The new fill character.
    00156    *
    00157    *  Sent to a stream object, this manipulator calls @c fill(c) for that
    00158    *  object.
    00159   */
    00160   template<typename _CharT>
    00161     inline _Setfill<_CharT>
    00162     setfill(_CharT __c)
    00163     { return { __c }; }
    00164
    00165   template<typename _CharT, typename _Traits>
    00166     inline basic_istream<_CharT, _Traits>&
    00167     operator>>(basic_istream<_CharT, _Traits>& __is, _Setfill<_CharT> __f)
    00168     {
    00169       __is.fill(__f._M_c);
    00170       return __is;
    00171     }
    00172
    00173   template<typename _CharT, typename _Traits>
    00174     inline basic_ostream<_CharT, _Traits>&
    00175     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f)
    00176     {
    00177       __os.fill(__f._M_c);
    00178       return __os;
    00179     }
    00180
    00181
    00182   struct _Setprecision { int _M_n; };
    00183
    00184   /**
    00185    *  @brief  Manipulator for @c precision.
    00186    *  @param  n  The new precision.
    00187    *
    00188    *  Sent to a stream object, this manipulator calls @c precision(n) for
    00189    *  that object.
    00190   */
    00191   inline _Setprecision
    00192   setprecision(int __n)
    00193   { return { __n }; }
    00194
    00195   template<typename _CharT, typename _Traits>
    00196     inline basic_istream<_CharT, _Traits>&
    00197     operator>>(basic_istream<_CharT, _Traits>& __is, _Setprecision __f)
    00198     {
    00199       __is.precision(__f._M_n);
    00200       return __is;
    00201     }
    00202
    00203   template<typename _CharT, typename _Traits>
    00204     inline basic_ostream<_CharT, _Traits>&
    00205     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f)
    00206     {
    00207       __os.precision(__f._M_n);
    00208       return __os;
    00209     }
    00210
    00211
    00212   struct _Setw { int _M_n; };
    00213
    00214   /**
    00215    *  @brief  Manipulator for @c width.
    00216    *  @param  n  The new width.
    00217    *
    00218    *  Sent to a stream object, this manipulator calls @c width(n) for
    00219    *  that object.
    00220   */
    00221   inline _Setw
    00222   setw(int __n)
    00223   { return { __n }; }
    00224
    00225   template<typename _CharT, typename _Traits>
    00226     inline basic_istream<_CharT, _Traits>&
    00227     operator>>(basic_istream<_CharT, _Traits>& __is, _Setw __f)
    00228     {
    00229       __is.width(__f._M_n);
    00230       return __is;
    00231     }
    00232
    00233   template<typename _CharT, typename _Traits>
    00234     inline basic_ostream<_CharT, _Traits>&
    00235     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setw __f)
    00236     {
    00237       __os.width(__f._M_n);
    00238       return __os;
    00239     }
    00240
    00241 #ifdef __GXX_EXPERIMENTAL_CXX0X__
    00242
    00243   template<typename _MoneyT>
    00244     struct _Get_money { _MoneyT& _M_mon; bool _M_intl; };
    00245
    00246   /**
    00247    *  @brief  Extended manipulator for extracting money.
    00248    *  @param  mon  Either long double or a specialization of @c basic_string.
    00249    *  @param  intl A bool indicating whether international format
    00250    *               is to be used.
    00251    *
    00252    *  Sent to a stream object, this manipulator extracts @a mon.
    00253   */
    00254   template<typename _MoneyT>
    00255     inline _Get_money<_MoneyT>
    00256     get_money(_MoneyT& __mon, bool __intl = false)
    00257     { return { __mon, __intl }; }
    00258
    00259   template<typename _CharT, typename _Traits, typename _MoneyT>
    00260     basic_istream<_CharT, _Traits>&
    00261     operator>>(basic_istream<_CharT, _Traits>& __is, _Get_money<_MoneyT> __f)
    00262     {
    00263       typedef istreambuf_iterator<_CharT, _Traits> _Iter;
    00264       typedef money_get<_CharT, _Iter> _MoneyGet;
    00265
    00266       ios_base::iostate __err = ios_base::goodbit;
    00267       const _MoneyGet& __mg = use_facet<_MoneyGet>(__is.getloc());
    00268
    00269       __mg.get(_Iter(__is.rdbuf()), _Iter(), __f._M_intl,
    00270            __is, __err, __f._M_mon);
    00271
    00272       if (ios_base::goodbit != __err)
    00273     __is.setstate(__err);
    00274
    00275       return __is;
    00276     }
    00277
    00278
    00279   template<typename _MoneyT>
    00280     struct _Put_money { const _MoneyT& _M_mon; bool _M_intl; };
    00281
    00282   /**
    00283    *  @brief  Extended manipulator for inserting money.
    00284    *  @param  mon  Either long double or a specialization of @c basic_string.
    00285    *  @param  intl A bool indicating whether international format
    00286    *               is to be used.
    00287    *
    00288    *  Sent to a stream object, this manipulator inserts @a mon.
    00289   */
    00290   template<typename _MoneyT>
    00291     inline _Put_money<_MoneyT>
    00292     put_money(const _MoneyT& __mon, bool __intl = false)
    00293     { return { __mon, __intl }; }
    00294
    00295   template<typename _CharT, typename _Traits, typename _MoneyT>
    00296     basic_ostream<_CharT, _Traits>&
    00297     operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_money<_MoneyT> __f)
    00298     {
    00299       typedef ostreambuf_iterator<_CharT, _Traits> _Iter;
    00300       typedef money_put<_CharT, _Iter> _MoneyPut;
    00301
    00302       const _MoneyPut& __mp = use_facet<_MoneyPut>(__os.getloc());
    00303       const _Iter __end = __mp.put(_Iter(__os.rdbuf()), __f._M_intl,
    00304                    __os, __os.fill(), __f._M_mon);
    00305
    00306       if (__end.failed())
    00307     __os.setstate(ios_base::badbit);
    00308
    00309       return __os;
    00310     }
    00311
    00312 #endif
    00313
    00314   // Inhibit implicit instantiations for required instantiations,
    00315   // which are defined via explicit instantiations elsewhere.
    00316   // NB:  This syntax is a GNU extension.
    00317 #if _GLIBCXX_EXTERN_TEMPLATE
    00318   extern template ostream& operator<<(ostream&, _Setfill<char>);
    00319   extern template ostream& operator<<(ostream&, _Setiosflags);
    00320   extern template ostream& operator<<(ostream&, _Resetiosflags);
    00321   extern template ostream& operator<<(ostream&, _Setbase);
    00322   extern template ostream& operator<<(ostream&, _Setprecision);
    00323   extern template ostream& operator<<(ostream&, _Setw);
    00324   extern template istream& operator>>(istream&, _Setfill<char>);
    00325   extern template istream& operator>>(istream&, _Setiosflags);
    00326   extern template istream& operator>>(istream&, _Resetiosflags);
    00327   extern template istream& operator>>(istream&, _Setbase);
    00328   extern template istream& operator>>(istream&, _Setprecision);
    00329   extern template istream& operator>>(istream&, _Setw);
    00330
    00331 #ifdef _GLIBCXX_USE_WCHAR_T
    00332   extern template wostream& operator<<(wostream&, _Setfill<wchar_t>);
    00333   extern template wostream& operator<<(wostream&, _Setiosflags);
    00334   extern template wostream& operator<<(wostream&, _Resetiosflags);
    00335   extern template wostream& operator<<(wostream&, _Setbase);
    00336   extern template wostream& operator<<(wostream&, _Setprecision);
    00337   extern template wostream& operator<<(wostream&, _Setw);
    00338   extern template wistream& operator>>(wistream&, _Setfill<wchar_t>);
    00339   extern template wistream& operator>>(wistream&, _Setiosflags);
    00340   extern template wistream& operator>>(wistream&, _Resetiosflags);
    00341   extern template wistream& operator>>(wistream&, _Setbase);
    00342   extern template wistream& operator>>(wistream&, _Setprecision);
    00343   extern template wistream& operator>>(wistream&, _Setw);
    00344 #endif
    00345 #endif
    00346
    00347 _GLIBCXX_END_NAMESPACE
    00348
    00349 #endif /* _GLIBCXX_IOMANIP */