[cygwin-apps/setup.git] / Generic.h

/*
 * Copyright (c) 2003 Robert Collins.
 *
 *     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.
 *
 *     A copy of the GNU General Public License can be found at
 *     http://www.gnu.org/
 *
 * Written by Robert Collins <robertc@hotmail.com>
 *
 */

#ifndef SETUP_GENERIC_H
#define SETUP_GENERIC_H

template <class _Visitor, class _Predicate>
struct _visit_if {
  _visit_if(_Visitor v, _Predicate p) : visitor(v), predicate (p) {}
  void operator() (typename _Visitor::argument_type& arg) {
    if (predicate(arg))
      visitor(arg);
  }
  _Visitor visitor;
  _Predicate predicate;
};

template <class _Visitor, class _Predicate>
_visit_if<_Visitor, _Predicate>
visit_if(_Visitor visitor, _Predicate predicate)
{
  return _visit_if<_Visitor, _Predicate>(visitor, predicate);
}

#endif /* SETUP_GENERIC_H */
Commit	Line	Data
31f0ccce RC	1	/*
	2	* Copyright (c) 2003 Robert Collins.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* A copy of the GNU General Public License can be found at
	10	* http://www.gnu.org/
	11	*
	12	* Written by Robert Collins <robertc@hotmail.com>
	13	*
	14	*/
	15
	16	#ifndef SETUP_GENERIC_H
	17	#define SETUP_GENERIC_H
	18
31f0ccce RC	19	template <class _Visitor, class _Predicate>
	20	struct _visit_if {
	21	_visit_if(_Visitor v, _Predicate p) : visitor(v), predicate (p) {}
	22	void operator() (typename _Visitor::argument_type& arg) {
	23	if (predicate(arg))
	24	visitor(arg);
	25	}
	26	_Visitor visitor;
	27	_Predicate predicate;
	28	};
	29
	30	template <class _Visitor, class _Predicate>
	31	_visit_if<_Visitor, _Predicate>
	32	visit_if(_Visitor visitor, _Predicate predicate)
	33	{
	34	return _visit_if<_Visitor, _Predicate>(visitor, predicate);
	35	}
	36
	37	#endif /* SETUP_GENERIC_H */