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/*
* Copyright (C) 2007-2023 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_STACK_H
#define BU_STACK_H
#include <memory>
#include "bu/config.h"
namespace Bu
{
template<typename value, typename valuealloc=std::allocator<value> >
class Stack
{
private:
typedef struct Chunk
{
value *pValue;
Chunk *pPrev;
} Chunk;
public:
Stack() :
pTop( NULL )
{
}
virtual ~Stack()
{
}
void push( const value &v )
{
Chunk *pChnk = new Chunk;
pChnk->pValue = va.allocate( 1 );
va.construct( pChnk->pValue, v );
pChnk->pPrev = pTop;
pTop = pChnk;
}
value &peek()
{
return *pTop->pValue;
}
value &top()
{
return *pTop->pValue;
}
value pop()
{
value ret( *pTop->pValue );
Chunk *pChnk = pTop;
pTop = pTop->pPrev;
va.destroy( pChnk->pValue );
va.deallocate( pChnk->pValue, 1 );
delete pChnk;
return ret;
}
void clear()
{
while( !isEmpty() )
pop();
}
bool isEmpty()
{
return pTop == NULL;
}
private:
Chunk *pTop;
valuealloc va;
};
}
#endif
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