iomanip.h   [plain text]

/* This is part of libio/iostream, providing -*- C++ -*- input/output.
Copyright (C) 1993 Free Software Foundation

This file is part of the GNU IO Library.  This library is free
software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

As a special exception, if you link this library with files
compiled with a GNU compiler to produce an executable, this does not cause
the resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */

#ifndef _IOMANIP_H
#ifdef __GNUG__
#pragma interface
#endif
#define _IOMANIP_H

#include <iostream.h>

extern "C++" {
//-----------------------------------------------------------------------------
//	Parametrized Manipulators as specified by ANSI draft
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
//	Stream Manipulators
//-----------------------------------------------------------------------------
//
template<class TP> class smanip; // TP = Type Param

template<class TP> class sapp {
    ios& (*_f)(ios&, TP);
public: 
    sapp(ios& (*f)(ios&, TP)) : _f(f) {}
    //
    smanip<TP> operator()(TP a) 
      { return smanip<TP>(_f, a); }
};

template<class TP>
inline istream& operator>>(istream& i, const smanip<TP>& m);
template<class TP>
inline ostream& operator<<(ostream& o, const smanip<TP>& m);

template <class TP> class smanip {
    ios& (*_f)(ios&, TP);
    TP _a;
public:
    smanip(ios& (*f)(ios&, TP), TP a) : _f(f), _a(a) {}
    //
    friend 
      istream& operator>> <>(istream& i, const smanip<TP>& m);
    friend
      ostream& operator<< <>(ostream& o, const smanip<TP>& m);
};

#ifdef __GNUG__
__extension__ extern template class smanip<int>;
__extension__ extern template class smanip<ios::fmtflags>;
#endif

template<class TP>
inline istream& operator>>(istream& i, const smanip<TP>& m)
{ (*m._f)(i, m._a); return i; }

template<class TP>
inline ostream& operator<<(ostream& o, const smanip<TP>& m)
{ (*m._f)(o, m._a); return o;}

#ifdef __GNUG__
__extension__ extern 
template istream& operator>>(istream&, const smanip<int>&);
__extension__ extern 
template istream& operator>>(istream&, const smanip<ios::fmtflags>&);
__extension__ extern 
template ostream& operator<<(ostream&, const smanip<int>&);
__extension__ extern 
template ostream& operator<<(ostream&, const smanip<ios::fmtflags>&);
#endif

//-----------------------------------------------------------------------------
//	Input-Stream Manipulators
//-----------------------------------------------------------------------------
//
template<class TP> class imanip; 

template<class TP> class iapp {
    istream& (*_f)(istream&, TP);
public: 
    iapp(istream& (*f)(istream&,TP)) : _f(f) {}
    //
    imanip<TP> operator()(TP a)
       { return imanip<TP>(_f, a); }
};

template <class TP>
inline istream& operator>>(istream&, const imanip<TP>&);

template <class TP> class imanip {
    istream& (*_f)(istream&, TP);
    TP _a;
public:
    imanip(istream& (*f)(istream&, TP), TP a) : _f(f), _a(a) {}
    //
    friend
      istream& operator>> <>(istream& i, const imanip<TP>& m);
};

template <class TP>
inline istream& operator>>(istream& i, const imanip<TP>& m)
{ return (*m._f)( i, m._a); }

//-----------------------------------------------------------------------------
//	Output-Stream Manipulators
//-----------------------------------------------------------------------------
//
template<class TP> class omanip; 

template<class TP> class oapp {
    ostream& (*_f)(ostream&, TP);
public: 
    oapp(ostream& (*f)(ostream&,TP)) : _f(f) {}
    //
    omanip<TP> operator()(TP a)
      { return omanip<TP>(_f, a); }
};

template <class TP>
inline ostream& operator<<(ostream&, const omanip<TP>&);

template <class TP> class omanip {
    ostream& (*_f)(ostream&, TP);
    TP _a;
public:
    omanip(ostream& (*f)(ostream&, TP), TP a) : _f(f), _a(a) {}
    //
    friend
      ostream& operator<< <>(ostream& o, const omanip<TP>& m);
};

template <class TP>
inline ostream& operator<<(ostream& o, const omanip<TP>& m)
{ return (*m._f)(o, m._a); }

//-----------------------------------------------------------------------------
//	Available Manipulators
//-----------------------------------------------------------------------------

//
// Macro to define an iomanip function, with one argument
// The underlying function is `__iomanip_<name>' 
//
#define __DEFINE_IOMANIP_FN1(type,param,function)         \
	extern ios& __iomanip_##function (ios&, param); \
	inline type<param> function (param n)           \
		        { return type<param> (__iomanip_##function, n); }

__DEFINE_IOMANIP_FN1( smanip, int, setbase)
__DEFINE_IOMANIP_FN1( smanip, int, setfill)
__DEFINE_IOMANIP_FN1( smanip, int, setprecision)
__DEFINE_IOMANIP_FN1( smanip, int, setw)

__DEFINE_IOMANIP_FN1( smanip, ios::fmtflags, resetiosflags)
__DEFINE_IOMANIP_FN1( smanip, ios::fmtflags, setiosflags)
} // extern "C++"

#endif /*!_IOMANIP_H*/