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/*
* Copyright (C) 2007-2012 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_ATOM_H
#define BU_ATOM_H
#include <stdint.h>
#include <memory>
#include "bu/config.h"
#include "bu/exceptionbase.h"
namespace Bu
{
/**
*
*@ingroup Containers
*/
template <typename t, typename talloc=std::allocator<t> >
class Atom
{
private:
typedef struct Atom<t, talloc> MyType;
public:
Atom() :
pData( NULL )
{
}
Atom( const MyType &oth ) :
pData( NULL )
{
if( oth.pData )
set( *oth.pData );
}
Atom( const t &oth ) :
pData( NULL )
{
set( oth );
}
virtual ~Atom()
{
clear();
}
bool has() const
{
return (pData != NULL);
}
void set( const t &val )
{
clear();
pData = ta.allocate( 1 );
ta.construct( pData, val );
}
t &get()
{
if( !pData )
throw Bu::ExceptionBase("Not set");
return *pData;
}
const t &get() const
{
if( !pData )
throw Bu::ExceptionBase("Not set");
return *pData;
}
void clear()
{
if( pData )
{
ta.destroy( pData );
ta.deallocate( pData, 1 );
pData = NULL;
}
}
operator const t &() const
{
if( !pData )
throw Bu::ExceptionBase("Not set");
return *pData;
}
operator t &()
{
if( !pData )
throw Bu::ExceptionBase("Not set");
return *pData;
}
MyType &operator =( const t &oth )
{
set( oth );
return *this;
}
MyType &operator =( const MyType &oth )
{
if( oth.pData )
set( *oth.pData );
return *this;
}
bool operator ==( const MyType &oth )
{
return (*pData) == (*oth.pData);
}
bool operator ==( const t &oth )
{
return (*pData) == oth;
}
t *operator ->()
{
if( !pData )
throw Bu::ExceptionBase("Not set");
return pData;
}
t &operator *()
{
if( !pData )
throw Bu::ExceptionBase("Not set");
return *pData;
}
private:
t *pData;
talloc ta;
};
}
#endif
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