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/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_RING_BUFFER_H
#define BU_RING_BUFFER_H
#include <memory>
#include "bu/exceptionbase.h"
namespace Bu
{
/**
*@ingroup Containers
*/
template<typename value, typename valuealloc=std::allocator<value> >
class RingBuffer
{
public:
RingBuffer( int nCapacity ) :
nCapacity( nCapacity ),
nStart( -1 ),
nEnd( -2 )
{
aData = va.allocate( nCapacity );
}
virtual ~RingBuffer()
{
for( int j = nStart; j < nEnd; j=(j+1%nCapacity) )
{
va.destroy( &aData[j] );
}
va.deallocate( aData, nCapacity );
}
int getCapacity()
{
return nCapacity;
}
bool isFilled()
{
return (nStart == nEnd);
}
bool isEmpty()
{
return (nStart == -1);
}
void enqueue( const value &v )
{
if( nStart == -1 )
{
nStart = 0;
nEnd = 1;
va.construct( &aData[0], v );
}
else if( nStart == nEnd )
{
throw ExceptionBase("Hey, it's full!");
}
else
{
va.construct( &aData[nEnd], v );
nEnd = (nEnd+1)%nCapacity;
}
}
value dequeue()
{
if( nStart == -1 )
{
throw ExceptionBase("No data");
}
else
{
value &v = aData[nStart];
va.destroy( &aData[nStart] );
nStart = (nStart+1)%nCapacity;
if( nStart == nEnd )
{
nStart = -1;
nEnd = -2;
}
return v;
}
}
value &operator[]( int nIndex )
{
return aData[(nIndex+nStart)%nCapacity];
}
private:
int nCapacity;
value *aData;
valuealloc va;
int nStart, nEnd;
};
}
#endif
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