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/*
* Copyright (C) 2007-2019 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"
#include "bu/queue.h"
#include "bu/sharedcore.h"
namespace Bu
{
template<typename value, typename valuealloc> class RingBuffer;
/** @cond DEVEL */
template<typename value, typename valuealloc>
class RingBufferCore
{
friend class RingBuffer<value, valuealloc>;
friend class SharedCore<RingBuffer<value, valuealloc>,
RingBufferCore<value, valuealloc> >;
private:
RingBufferCore() :
iCapacity( 0 ),
iStart( -1 ),
iEnd( -2 ),
aData( NULL )
{
}
virtual ~RingBufferCore()
{
clear();
}
void init( int iNewCapacity )
{
if( iCapacity > 0 )
return;
iCapacity = iNewCapacity;
iStart = -1;
iEnd = -2;
aData = va.allocate( iCapacity );
}
void clear()
{
for( int j = iStart; j < iEnd; j=(j+1%iCapacity) )
{
va.destroy( &aData[j] );
}
va.deallocate( aData, iCapacity );
aData = NULL;
iCapacity = 0;
}
void enqueue( const value &v )
{
if( iStart == -1 )
{
iStart = 0;
iEnd = 1;
va.construct( &aData[0], v );
return;
}
else if( iStart == iEnd )
{
// The ringbuffer is full
dequeue();
}
va.construct( &aData[iEnd], v );
iEnd = (iEnd+1)%iCapacity;
}
value dequeue()
{
if( iStart == -1 )
{
throw ExceptionBase("No data");
}
else
{
value &v = aData[iStart];
va.destroy( &aData[iStart] );
iStart = (iStart+1)%iCapacity;
if( iStart == iEnd )
{
iStart = -1;
iEnd = -2;
}
return v;
}
}
value &get( int iIndex )
{
return aData[(iIndex+iStart)%iCapacity];
}
value &first()
{
return aData[iStart];
}
value &last()
{
return aData[(iEnd-1+iCapacity)%iCapacity];
}
int getSize()
{
if( iStart < 0 )
return 0;
if( iEnd == iStart )
return iCapacity;
if( iEnd < iStart )
return iEnd-iStart;
return iCapacity-(iEnd-iStart);
}
int iCapacity;
int iStart, iEnd;
value *aData;
valuealloc va;
};
/** @endcond */
/**
*@ingroup Containers
*/
template<typename value, typename valuealloc=std::allocator<value> >
class RingBuffer : public Queue<value>, public SharedCore<
RingBuffer<value, valuealloc>,
RingBufferCore<value, valuealloc>
>
{
private:
typedef RingBuffer<value, valuealloc> MyType;
typedef RingBufferCore<value, valuealloc> Core;
protected:
using SharedCore<MyType, Core>::core;
using SharedCore<MyType, Core>::_hardCopy;
using SharedCore<MyType, Core>::_allocateCore;
public:
RingBuffer( int iCapacity )
{
core->init( iCapacity );
}
RingBuffer( const RingBuffer &rSrc ) :
SharedCore<MyType, Core>( rSrc )
{
}
virtual ~RingBuffer()
{
}
int getCapacity() const
{
return core->iCapacity;
}
bool isFilled() const
{
return (core->iStart == core->iEnd);
}
bool isEmpty() const
{
return (core->iStart == -1);
}
virtual void enqueue( const value &v )
{
_hardCopy();
core->enqueue( v );
}
virtual value dequeue()
{
_hardCopy();
return core->dequeue();
}
virtual int getSize() const
{
return core->getSize();
}
virtual value &peek()
{
_hardCopy();
return core->get( 0 );
}
virtual const value &peek() const
{
return core->get( 0 );
}
virtual value &first()
{
_hardCopy();
return core->first();
}
virtual value &last()
{
_hardCopy();
return core->last();
}
value &operator[]( int iIndex )
{
_hardCopy();
return core->get( iIndex );
}
protected:
virtual Core *_copyCore( Core *src )
{
Core *pRet = _allocateCore();
pRet->init( src->iCapacity );
int iSize = src->getSize();
for( int j = 0; j < iSize; j++ )
{
pRet->enqueue( src->get( j ) );
}
return pRet;
}
};
}
#endif
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