/* lb-blackbox-function.h
 * Copyright (C) 2005 Pascal Giorgi
 *
 * Written by Pascal Giorgi <pgiorgi@uwaterloo.ca>
 *
 * ========LICENCE========
 * This file is part of the library LinBox.
 *
  * LinBox is free software: you can redistribute it and/or modify
 * it under the terms of the  GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * ========LICENCE========
 */

#ifndef __LINBOX_lb_blackbox_function_H
#define __LINBOX_lb_blackbox_function_H


#include <lb-blackbox-abstract.h>
#include <lb-blackbox-functor.h>


/***********************************************************
 * API to launch a generic function over a linbox blackbox *
 **********************************************************/

class BlackboxFunction {
public:
	// call a functor over a blackbox from the hashtable, result is given through 1st parameter
	template<class Functor, class Result>
	static void call(Result &res, const std::pair<const BlackboxKey, BlackboxAbstract*> &blackbox, const Functor &functor){
		ApplyBlackboxFunctor<Functor, Result> Ap(res, functor);
		(blackbox.second)->Accept(Ap);
	}

	// call a functor over a blackbox from the hashtable, no result
	template<class Functor>
	static void call(const std::pair<const BlackboxKey, BlackboxAbstract*> &v, const Functor &f){
		void *dumbresult;
		call(dumbresult,v,f);
	}

	// call a functor over a blackbox from its key, result is given through 1st parameter
	template<class Functor, class Result>
	static void call(Result &res, const BlackboxKey &key, const Functor &functor){
		BlackboxTable::const_iterator it = blackbox_hashtable.find(key);
		if (it != blackbox_hashtable.end())
			BlackboxFunction::call(res, *it, functor);
		else
			throw lb_runtime_error("LinBox ERROR: use of a non allocated blackbox \n");// throw an exception
	}

	// call a functor over a blackbox from its key, no result
	template<class Functor>
	static void call(const BlackboxKey &k, const Functor &f) {
		void *dumbresult;
		call(dumbresult,k,f);
	}
};


#endif

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