File: omanip.h

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/*
**      PJL C++ Library
**      omanip.h
**
**      Copyright (C) 2001  Paul J. Lucas
**
**      This program 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 of the License, or
**      (at your option) any later version.
**
**      This program 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 program; if not, write to the Free Software
**      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef omanip_H
#define omanip_H

// standard
#include <iostream>

namespace PJL {

//*****************************************************************************
//
// SYNOPSIS
//
        template< typename Arg > class omanip
//
// DESCRIPTION
//
//      An omanip is a class for assisting in the creating of ostream
//      manipulators by storing a pointer to a function and its argument to be
//      called later via operator<<().
//
// SEE ALSO
//
//      Angelika Langer and Klaus Kreft.  "Standard C++ IOStreams and Locales."
//      Addison-Wesley, Reading, MA., pp. 179-191.
//
//*****************************************************************************
{
public:
    typedef std::ostream& (*func_type)( std::ostream&, Arg );

    omanip( func_type f, Arg const &arg ) : f_( f ), arg_( arg ) { }

    friend std::ostream& operator<<( std::ostream &o, omanip<Arg> const &om ) {
        return (*om.f_)( o, om.arg_ );
    }
private:
    func_type const f_;
    Arg const arg_;
};

} // namespace PJL

#endif  /* omanip_H */
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