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ExpressionInterface.h

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// ircproxy -- An IRC bouncer.
//
//! @file ExpressionInterface.h
//! @brief This file contains the declaration of class ExpressionInterface.
//
// Copyright (C) 2006, 2007 by
//
// Carlo Wood, Run on IRC <carlo@alinoe.com>
// RSA-1024 0x624ACAD5 1997-01-26                    Sign & Encrypt
// Fingerprint16 = 32 EC A7 B6 AC DB 65 A6  F6 F6 55 DD 1C DC FF 61
//
// This file may be distributed under the terms of the Q Public License
// version 1.0 as appearing in the file LICENSE.QPL included in the
// packaging of this file.

#ifndef EXPRESSIONINTERFACE_H
#define EXPRESSIONINTERFACE_H

#ifndef USE_PCH
#include <iosfwd>
#include <boost/shared_ptr.hpp>
#endif

class ExpressionEventServer;

/*! @brief Pure virtual interface for expressions.
 *
 * This class is a base class for expressions (that return true or false).
 */
class ExpressionInterface {
  public:
    //! virtual destructor.
    virtual ~ExpressionInterface() { }
    //! Mark that ExpressionEventServer \a event_server is watching this expression.
    virtual void add_event_server(boost::shared_ptr<ExpressionEventServer> const& event_server) = 0;
    //! Evaluate the expression.
    virtual bool evaluate(void) = 0;
    //! Remove ExpressionEventServer \a event_server from this expression.
    virtual void sub_event_server(ExpressionEventServer*) = 0;
#ifdef CWDEBUG
    //! Print the expression on ostream \a os
    virtual void print_on(std::ostream& os) const = 0;
#endif
};

#endif // EXPRESSIONINTERFACE_H

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