libio/iomanip.h

   1 /* This is part of libio/iostream, providing -*- C++ -*- input/output.
   2 Copyright (C) 1993 Free Software Foundation
   3
   4 This file is part of the GNU IO Library.  This library is free
   5 software; you can redistribute it and/or modify it under the
   6 terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this library; see the file COPYING.  If not, write to the Free
  17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 As a special exception, if you link this library with files
  20 compiled with a GNU compiler to produce an executable, this does not cause
  21 the resulting executable to be covered by the GNU General Public License.
  22 This exception does not however invalidate any other reasons why
  23 the executable file might be covered by the GNU General Public License. */
  24
  25 #ifndef _IOMANIP_H
  26 #ifdef __GNUG__
  27 #pragma interface
  28 #endif
  29 #define _IOMANIP_H
  30
  31 #include <iostream.h>
  32
  33 extern "C++" {
  34 //-----------------------------------------------------------------------------
  35 //      Parametrized Manipulators as specified by ANSI draft
  36 //-----------------------------------------------------------------------------
  37
  38 //-----------------------------------------------------------------------------
  39 //      Stream Manipulators
  40 //-----------------------------------------------------------------------------
  41 //
  42 template<class TP> class smanip; // TP = Type Param
  43
  44 template<class TP> class sapp {
  45     ios& (*_f)(ios&, TP);
  46 public:
  47     sapp(ios& (*f)(ios&, TP)) : _f(f) {}
  48     //
  49     smanip<TP> operator()(TP a)
  50       { return smanip<TP>(_f, a); }
  51 };
  52
  53 template<class TP>
  54 inline istream& operator>>(istream& i, const smanip<TP>& m);
  55 template<class TP>
  56 inline ostream& operator<<(ostream& o, const smanip<TP>& m);
  57
  58 template <class TP> class smanip {
  59     ios& (*_f)(ios&, TP);
  60     TP _a;
  61 public:
  62     smanip(ios& (*f)(ios&, TP), TP a) : _f(f), _a(a) {}
  63     //
  64     friend
  65       istream& operator>> <>(istream& i, const smanip<TP>& m);
  66     friend
  67       ostream& operator<< <>(ostream& o, const smanip<TP>& m);
  68 };
  69
  70 #ifdef __GNUG__
  71 __extension__ extern template class smanip<int>;
  72 __extension__ extern template class smanip<ios::fmtflags>;
  73 #endif
  74
  75 template<class TP>
  76 inline istream& operator>>(istream& i, const smanip<TP>& m)
  77 { (*m._f)(i, m._a); return i; }
  78
  79 template<class TP>
  80 inline ostream& operator<<(ostream& o, const smanip<TP>& m)
  81 { (*m._f)(o, m._a); return o;}
  82
  83 #ifdef __GNUG__
  84 __extension__ extern
  85 template istream& operator>>(istream&, const smanip<int>&);
  86 __extension__ extern
  87 template istream& operator>>(istream&, const smanip<ios::fmtflags>&);
  88 __extension__ extern
  89 template ostream& operator<<(ostream&, const smanip<int>&);
  90 __extension__ extern
  91 template ostream& operator<<(ostream&, const smanip<ios::fmtflags>&);
  92 #endif
  93
  94 //-----------------------------------------------------------------------------
  95 //      Input-Stream Manipulators
  96 //-----------------------------------------------------------------------------
  97 //
  98 template<class TP> class imanip;
  99
 100 template<class TP> class iapp {
 101     istream& (*_f)(istream&, TP);
 102 public:
 103     iapp(istream& (*f)(istream&,TP)) : _f(f) {}
 104     //
 105     imanip<TP> operator()(TP a)
 106        { return imanip<TP>(_f, a); }
 107 };
 108
 109 template <class TP>
 110 inline istream& operator>>(istream&, const imanip<TP>&);
 111
 112 template <class TP> class imanip {
 113     istream& (*_f)(istream&, TP);
 114     TP _a;
 115 public:
 116     imanip(istream& (*f)(istream&, TP), TP a) : _f(f), _a(a) {}
 117     //
 118     friend
 119       istream& operator>> <>(istream& i, const imanip<TP>& m);
 120 };
 121
 122 template <class TP>
 123 inline istream& operator>>(istream& i, const imanip<TP>& m)
 124 { return (*m._f)( i, m._a); }
 125
 126 //-----------------------------------------------------------------------------
 127 //      Output-Stream Manipulators
 128 //-----------------------------------------------------------------------------
 129 //
 130 template<class TP> class omanip;
 131
 132 template<class TP> class oapp {
 133     ostream& (*_f)(ostream&, TP);
 134 public:
 135     oapp(ostream& (*f)(ostream&,TP)) : _f(f) {}
 136     //
 137     omanip<TP> operator()(TP a)
 138       { return omanip<TP>(_f, a); }
 139 };
 140
 141 template <class TP>
 142 inline ostream& operator<<(ostream&, const omanip<TP>&);
 143
 144 template <class TP> class omanip {
 145     ostream& (*_f)(ostream&, TP);
 146     TP _a;
 147 public:
 148     omanip(ostream& (*f)(ostream&, TP), TP a) : _f(f), _a(a) {}
 149     //
 150     friend
 151       ostream& operator<< <>(ostream& o, const omanip<TP>& m);
 152 };
 153
 154 template <class TP>
 155 inline ostream& operator<<(ostream& o, const omanip<TP>& m)
 156 { return (*m._f)(o, m._a); }
 157
 158 //-----------------------------------------------------------------------------
 159 //      Available Manipulators
 160 //-----------------------------------------------------------------------------
 161
 162 //
 163 // Macro to define an iomanip function, with one argument
 164 // The underlying function is `__iomanip_<name>'
 165 //
 166 #define __DEFINE_IOMANIP_FN1(type,param,function)         \
 167         extern ios& __iomanip_##function (ios&, param); \
 168         inline type<param> function (param n)           \
 169                         { return type<param> (__iomanip_##function, n); }
 170
 171 __DEFINE_IOMANIP_FN1( smanip, int, setbase)
 172 __DEFINE_IOMANIP_FN1( smanip, int, setfill)
 173 __DEFINE_IOMANIP_FN1( smanip, int, setprecision)
 174 __DEFINE_IOMANIP_FN1( smanip, int, setw)
 175
 176 __DEFINE_IOMANIP_FN1( smanip, ios::fmtflags, resetiosflags)
 177 __DEFINE_IOMANIP_FN1( smanip, ios::fmtflags, setiosflags)
 178 } // extern "C++"
 179
 180 #endif /*!_IOMANIP_H*/