/*Copyright 2009,2010 Alex Graves

This file is part of RNNLIB.

RNNLIB 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 3 of the License, or
(at your option) any later version.

RNNLIB 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 RNNLIB.  If not, see <http://www.gnu.org/licenses/>.*/

#ifndef _INCLUDED_Connection_h  
#define _INCLUDED_Connection_h  

#include <iostream>
#include "Named.hpp"

struct Connection: public Named
{
	//data
	Layer* from;
	Layer* to;
	
	//functions
	Connection(const string& name, Layer* f, Layer* t):
		Named(name),
		from(f),
		to(t)
	{
		assert(from);
		assert(to);
		assert(from->output_size());
		assert(to->input_size());
	}
	virtual ~Connection(){}
	virtual size_t num_weights() const {return 0;}
	virtual void feed_forward(const vector<int>& coords){}
	virtual void feed_back(const vector<int>& coords){}
	virtual void update_derivs(const vector<int>& coords){}
	virtual void print(ostream& out) const{}
	virtual const View<real_t> weights(){return View<real_t>();}
};
static ostream& operator <<(ostream& out, const Connection& c)
{
	c.print(out);
	return out;
}

#endif