sc_signal_ifs.h

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/*****************************************************************************

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2014 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License (the "License");
  You may not use this file except in compliance with such restrictions and
  limitations. You may obtain instructions on how to receive a copy of the
  License at http://www.accellera.org/. Software distributed by Contributors
  under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
  ANY KIND, either express or implied. See the License for the specific
  language governing rights and limitations under the License.

 *****************************************************************************/

/*****************************************************************************

  sc_signal_ifs.h -- The sc_signal<T> interface classes.

  Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21

  CHANGE LOG IS AT THE END OF THE FILE
 *****************************************************************************/

#ifndef SC_SIGNAL_IFS_H
#define SC_SIGNAL_IFS_H


#include "sysc/communication/sc_interface.h"
#include "sysc/communication/sc_writer_policy.h"


namespace sc_dt
{
    class sc_logic;
}

namespace sc_core {

class sc_signal_bool_deval;
class sc_signal_logic_deval;


/**************************************************************************/
template <class T>
class sc_signal_in_if
: virtual public sc_interface
{
public:

    // get the value changed event
    virtual const sc_event& value_changed_event() const = 0;


    // read the current value
    virtual const T& read() const = 0;

    // get a reference to the current value (for tracing)
    virtual const T& get_data_ref() const = 0;


    // was there a value changed event?
    virtual bool event() const = 0;

protected:

    // constructor

    sc_signal_in_if()
        {}

private:

    // disabled
    sc_signal_in_if( const sc_signal_in_if<T>& );
    sc_signal_in_if<T>& operator = ( const sc_signal_in_if<T>& );
};


/**************************************************************************/
class sc_reset;

template <>
class sc_signal_in_if<bool>
: virtual public sc_interface
{
    friend class sc_reset;
public:

    // get the value changed event
    virtual const sc_event& value_changed_event() const = 0;

    // get the positive edge event
    virtual const sc_event& posedge_event() const = 0;

    // get the negative edge event
    virtual const sc_event& negedge_event() const = 0;


    // read the current value
    virtual const bool& read() const = 0;

    // get a reference to the current value (for tracing)
    virtual const bool& get_data_ref() const = 0;


    // was there a value changed event?
    virtual bool event() const = 0;

    // was there a positive edge event?
    virtual bool posedge() const = 0;

    // was there a negative edge event?
    virtual bool negedge() const = 0;

protected:

    // constructor

    sc_signal_in_if()
        {}

private:

    // disabled
    sc_signal_in_if( const sc_signal_in_if<bool>& );
    sc_signal_in_if<bool>& operator = ( const sc_signal_in_if<bool>& );

    // designate this object as a reset signal
    virtual sc_reset* is_reset() const
      { return NULL; }
};


/**************************************************************************/
template <>
class sc_signal_in_if<sc_dt::sc_logic>
: virtual public sc_interface
{
public:

    // get the value changed event
    virtual const sc_event& value_changed_event() const = 0;

    // get the positive edge event
    virtual const sc_event& posedge_event() const = 0;

    // get the negative edge event
    virtual const sc_event& negedge_event() const = 0;


    // read the current value
    virtual const sc_dt::sc_logic& read() const = 0;

    // get a reference to the current value (for tracing)
    virtual const sc_dt::sc_logic& get_data_ref() const = 0;


    // was there a value changed event?
    virtual bool event() const = 0;

    // was there a positive edge event?
    virtual bool posedge() const = 0;

    // was there a negative edge event?
    virtual bool negedge() const = 0;


protected:

    // constructor

    sc_signal_in_if()
        {}

private:

    // disabled
    sc_signal_in_if( const sc_signal_in_if<sc_dt::sc_logic>& );
    sc_signal_in_if<sc_dt::sc_logic>& operator = (
        const sc_signal_in_if<sc_dt::sc_logic>& );
};


/**************************************************************************/
template< typename T >
class sc_signal_write_if : public virtual sc_interface
{
public:
    sc_signal_write_if() {}
    // write the new value
    virtual void write( const T& ) = 0;
    virtual sc_writer_policy get_writer_policy() const
        { return SC_DEFAULT_WRITER_POLICY; }
private:
    // disabled
    sc_signal_write_if( const sc_signal_write_if<T>& );
    sc_signal_write_if<T>& operator = ( const sc_signal_write_if<T>& );
};


/**************************************************************************/
template <class T>
class sc_signal_inout_if
: public sc_signal_in_if<T>, public sc_signal_write_if<T>
{

protected:

    // constructor

    sc_signal_inout_if()
        {}

private:

    // disabled
    sc_signal_inout_if( const sc_signal_inout_if<T>& );
    sc_signal_inout_if<T>& operator = ( const sc_signal_inout_if<T>& );
};


/**************************************************************************/
// sc_signal_out_if can also be read from, hence no difference with
// sc_signal_inout_if.

#define sc_signal_out_if sc_signal_inout_if

} // namespace sc_core

//$Log: sc_signal_ifs.h,v $
//Revision 1.4  2011/08/26 20:45:43  acg
// Andy Goodrich: moved the modification log to the end of the file to
// eliminate source line number skew when check-ins are done.
//
//Revision 1.3  2011/02/18 20:23:45  acg
// Andy Goodrich: Copyright update.
//
//Revision 1.2  2010/12/07 19:50:37  acg
// Andy Goodrich: addition of writer policies, courtesy of Philipp Hartmann.
//
//Revision 1.1.1.1  2006/12/15 20:20:04  acg
//SystemC 2.3
//
//Revision 1.4  2006/08/29 23:35:00  acg
// Andy Goodrich: added bind_count() method to allow users to determine which
// ports are connected in before_end_of_elaboration().
//
//Revision 1.3  2006/04/11 23:11:57  acg
//  Andy Goodrich: Changes for reset support that only includes
//  sc_cthread_process instances.
//
//Revision 1.2  2006/01/03 23:18:26  acg
//Changed copyright to include 2006.
//
//Revision 1.1.1.1  2005/12/19 23:16:43  acg
//First check in of SystemC 2.1 into its own archive.
//
//Revision 1.10  2005/09/15 23:01:51  acg
//Added std:: prefix to appropriate methods and types to get around
//issues with the Edison Front End.
//
//Revision 1.9  2005/06/29 18:12:12  acg
//Added $log.
//
//Revision 1.8  2005/06/10 22:43:55  acg
//Added CVS change log annotation.
//

#endif

// Taf!