109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoID.h
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// (c) GeNeura Team, 1998
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/*
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Contact: todos@geneura.ugr.es, http://geneura.ugr.es
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*/
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//-----------------------------------------------------------------------------
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#ifndef EOID_H
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#define EOID_H
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//-----------------------------------------------------------------------------
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#include <iostream> // istream, ostream
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#include <string> // for string
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using namespace std;
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//-----------------------------------------------------------------------------
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// eoID
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//-----------------------------------------------------------------------------
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/** eoID is a template class that adds an ID to an object.\\
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Requisites for template instantiation are that the object must admit a default ctor
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and a copy ctor. The Object must be an eoObject, thus, it must have its methods: className,
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printOn, readFrom, that is why we don´t subclass eoObject to avoid multiple inheritance.\\
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IDs can be used to count objects of a a kind, or track them, or whatever.
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@see eoObject
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*/
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template <class Object>
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class eoID: public Object
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{
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public:
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/// Main ctor from an already built Object.
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eoID( const Object& _o): Object( _o ), thisID(globalID++) {};
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/// Copy constructor.
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eoID( const eoID& _id): Object( _id ), thisID(globalID++ ) {};
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/// Virtual dtor. They are needed in virtual class hierarchies
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virtual ~eoID() {};
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///returns the age of the object
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unsigned long ID() const {return thisID;}
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/** @name Methods from eoObject
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readFrom and printOn are directly inherited from eo1d
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*/
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//@{
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/** Return the class id. This should be redefined in each class; but
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it's got code as an example of implementation. Only "leaf" classes
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can be non-virtual.
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*/
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virtual string className() const { return string("[eoID]")+Object::className(); };
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/**
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* Read object.
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* @param _is A istream.
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* @throw runtime_exception If a valid object can't be read.
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*/
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virtual void readFrom(istream& _is) {
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Object::readFrom( _is );
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_is >> thisID;
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}
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/**
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* Write object. It's called printOn since it prints the object _on_ a stream.
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* @param _os A ostream.
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*/
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virtual void printOn(ostream& _os) const{
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Object::printOn( _os );
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_os << thisID;
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}
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//@}
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private:
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/** Default Constructor. \\
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It´s private so that it is not used anywhere; the right way of using this object
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is to create an Object and passing it to an aged by means of the copy ctor; that way
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it´s turned into an Aged object*/
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eoID(): Object(), thisID( globalID++ ) {};
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unsigned long thisID;
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static unsigned long globalID;
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};
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template< class Object>
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unsigned long eoID< Object >::globalID = 0;
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#endif EOID_H
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