Update_Receiver.hxx

// 
// Copyright (C) 2006 James M. Lawrence.  All rights reserved.
// 
// software: esve-1.0.3
// file: esve/message/Update_Receiver.hxx
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 
// 2. The origin of this software must not be misrepresented; you must
//    not claim that you wrote the original software.  If you use this
//    software in a product, an acknowledgment in the product 
//    documentation would be appreciated but is not required.
// 
// 3. Altered source versions must be plainly marked as such, and must
//    not be misrepresented as being the original software.
// 
// 4. The name of the author may not be used to endorse or promote
//    products derived from this software without specific prior written
//    permission.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY,
// AND WITH NO CLAIM AS TO ITS SUITABILITY FOR ANY PURPOSE.  IN NO EVENT
// SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM WHATSOEVER MADE IN CONNECTION
// TO THIS SOFTWARE.
// 

#ifndef esve_message_Update_Receiver_hxx
#define esve_message_Update_Receiver_hxx

namespace esve { namespace message {

namespace impl { class Update_Receiver ; }



class Update_Receiver
{
public:
    virtual ~Update_Receiver() = 0 ;

    // mandatory implementation
    virtual impl::Update_Receiver & update_receiver() = 0 ;

protected:
    Update_Receiver() ;

    virtual void update() = 0 ;

    virtual void update( double dt ) = 0 ;

    // Allow subclasses to call update().
    static void call_update( Update_Receiver & ) ;
    static void call_update( Update_Receiver &, double dt ) ;

private:
    Update_Receiver( const Update_Receiver & ) ;
    Update_Receiver & operator=( const Update_Receiver & ) ;
} ;

}} // namespace esve::message

#endif

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