tlm_fifo_peek.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
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  language governing rights and limitations under the License.

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#ifndef __TLM_FIFO_PEEK_H__
#define __TLM_FIFO_PEEK_H__

namespace tlm {

template < typename T>
inline
T
tlm_fifo<T>::peek( tlm_tag<T> * ) const {

  while( is_empty() ) {

    // call free-standing sc_core::wait(),
    // since sc_prim_channel::wait(.) is not const

    sc_core::wait( m_data_written_event );
  }

  return buffer.read_data();

}

template < typename T>
inline
bool
tlm_fifo<T>::nb_peek( T &t ) const {

  if( used() < 1 ) {
    return false;
  }

  t = buffer.peek_data( 0 );
  return true;

}

template < typename T>
inline
bool
tlm_fifo<T>::nb_peek( T &t , int n ) const {

  if( n >= used() || n < -1 ) {
    return false;
  }

  if( n == -1 ) {
    n = used() - 1;
  }

  t = buffer.peek_data( n );
  return true;

}

template< typename T >
inline
bool
tlm_fifo<T>::nb_can_peek( tlm_tag<T> * ) const
{
  return !is_empty();
}

template < typename T>
inline
bool
tlm_fifo<T>::nb_poke( const T &t , int n ) {

  if( n >= used() || n < 0 ) {
    return false;
  }

  buffer.poke_data( n ) = t;
  return true;

}

} // namespace tlm

#endif