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> class smanip {
  54     ios& (*_f)(ios&, TP);
  55     TP _a;
  56 public:
  57     smanip(ios& (*f)(ios&, TP), TP a) : _f(f), _a(a) {}
  58     //
  59     friend
  60       istream& operator>>(istream& i, const smanip<TP>& m);
  61     friend
  62       ostream& operator<<(ostream& o, const smanip<TP>& m);
  63 };
  64
  65 #ifdef __GNUG__
  66 extern template class smanip<int>;
  67 extern template class smanip<ios::fmtflags>;
  68 #endif
  69
  70 template<class TP>
  71 inline istream& operator>>(istream& i, const smanip<TP>& m)
  72 { (*m._f)(i, m._a); return i; }
  73
  74 template<class TP>
  75 inline ostream& operator<<(ostream& o, const smanip<TP>& m)
  76 { (*m._f)(o, m._a); return o;}
  77
  78 #ifdef __GNUG__
  79 extern template istream& operator>>(istream&, const smanip<int>&);
  80 extern template istream& operator>>(istream&, const smanip<ios::fmtflags>&);
  81 extern template ostream& operator<<(ostream&, const smanip<int>&);
  82 extern template ostream& operator<<(ostream&, const smanip<ios::fmtflags>&);
  83 #endif
  84
  85 //-----------------------------------------------------------------------------
  86 //      Input-Stream Manipulators
  87 //-----------------------------------------------------------------------------
  88 //
  89 template<class TP> class imanip;
  90
  91 template<class TP> class iapp {
  92     istream& (*_f)(istream&, TP);
  93 public:
  94     iapp(istream& (*f)(istream&,TP)) : _f(f) {}
  95     //
  96     imanip<TP> operator()(TP a)
  97        { return imanip<TP>(_f, a); }
  98 };
  99
 100 template <class TP> class imanip {
 101     istream& (*_f)(istream&, TP);
 102     TP _a;
 103 public:
 104     imanip(istream& (*f)(istream&, TP), TP a) : _f(f), _a(a) {}
 105     //
 106     friend
 107       istream& operator>>(istream& i, const imanip<TP>& m);
 108 };
 109
 110 template <class TP>
 111 inline istream& operator>>(istream& i, const imanip<TP>& m)
 112 { return (*m._f)( i, m._a); }
 113
 114 //-----------------------------------------------------------------------------
 115 //      Output-Stream Manipulators
 116 //-----------------------------------------------------------------------------
 117 //
 118 template<class TP> class omanip;
 119
 120 template<class TP> class oapp {
 121     ostream& (*_f)(ostream&, TP);
 122 public:
 123     oapp(ostream& (*f)(ostream&,TP)) : _f(f) {}
 124     //
 125     omanip<TP> operator()(TP a)
 126       { return omanip<TP>(_f, a); }
 127 };
 128
 129 template <class TP> class omanip {
 130     ostream& (*_f)(ostream&, TP);
 131     TP _a;
 132 public:
 133     omanip(ostream& (*f)(ostream&, TP), TP a) : _f(f), _a(a) {}
 134     //
 135     friend
 136       ostream& operator<<(ostream& o, const omanip<TP>& m);
 137 };
 138
 139 template <class TP>
 140 inline ostream& operator<<(ostream& o, const omanip<TP>& m)
 141 { return (*m._f)(o, m._a); }
 142
 143 //-----------------------------------------------------------------------------
 144 //      Available Manipulators
 145 //-----------------------------------------------------------------------------
 146
 147 //
 148 // Macro to define an iomanip function, with one argument
 149 // The underlying function is `__iomanip_<name>'
 150 //
 151 #define __DEFINE_IOMANIP_FN1(type,param,function)         \
 152         extern ios& __iomanip_##function (ios&, param); \
 153         inline type<param> function (param n)           \
 154                         { return type<param> (__iomanip_##function, n); }
 155
 156 __DEFINE_IOMANIP_FN1( smanip, int, setbase)
 157 __DEFINE_IOMANIP_FN1( smanip, int, setfill)
 158 __DEFINE_IOMANIP_FN1( smanip, int, setprecision)
 159 __DEFINE_IOMANIP_FN1( smanip, int, setw)
 160
 161 __DEFINE_IOMANIP_FN1( smanip, ios::fmtflags, resetiosflags)
 162 __DEFINE_IOMANIP_FN1( smanip, ios::fmtflags, setiosflags)
 163 } // extern "C++"
 164
 165 #endif /*!_IOMANIP_H*/