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/* This file is (c) 2008-2010 Konstantin Isakov <ikm@users.berlios.de>
* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
#ifndef __SPTR_HH_INCLUDED__
#define __SPTR_HH_INCLUDED__
// A generic non-intrusive smart-pointer template. We could use boost::, tr1::
// or whatever, but since there's no standard solution yet, it isn't worth
// the dependency given the simplicity of the template.
template< class T >
class sptr_base
{
template< class TT > friend class sptr_base;
T * p;
unsigned * count;
void increment()
{
if ( count )
++*count;
}
public:
sptr_base(): p( 0 ), count( 0 ) {}
sptr_base( T * p_ ): p( p_ ), count( p ? new unsigned( 1 ) : 0 )
{
}
sptr_base( sptr_base< T > const & other ): p( other.p ), count( other.count )
{ increment(); }
// TT is meant to be a derivative of T
template< class TT >
sptr_base( sptr_base< TT > const & other ): p( ( T * ) other.p ),
count( other.count )
{ increment(); }
void reset()
{
if ( count )
{
if ( ! -- *count )
{
delete count;
count = 0;
if ( p )
{
T * p_ = p;
p = 0;
delete p_;
}
}
else
{
p = 0;
count = 0;
}
}
}
unsigned use_count() const
{ return count; }
sptr_base & operator = ( sptr_base const & other )
{ if ( &other != this ) { reset(); p = other.p; count = other.count; increment(); }
return * this; }
bool operator ! ( void ) const
{ return !p; }
bool operator == ( sptr_base const & other ) const
{ return p == other.p; }
bool operator != ( sptr_base const & other ) const
{ return p != other.p; }
~sptr_base()
{ reset(); }
protected:
T * get_base( void ) const
{ return p; }
};
template< class T >
class sptr: public sptr_base< T >
{
public:
sptr() {}
sptr( T * p ): sptr_base< T >( p ) {}
// TT is meant to be a derivative of T
template< class TT >
sptr( sptr< TT > const & other ): sptr_base< T >( other ) {}
// Retrieval
T * get( void ) const
{ return sptr_base< T > :: get_base(); }
T * operator -> ( void ) const
{ return get(); }
T & operator * ( void ) const
{ return * get(); }
// Check
operator bool( void ) const
{ return get(); }
bool operator ! ( void ) const
{ return !get(); }
};
template< class T >
class const_sptr: public sptr_base< T >
{
public:
const_sptr() {}
const_sptr( T * p_ ): sptr_base< T >( p_ ) {}
const_sptr( sptr< T > const & other ): sptr_base< T >( other ) {}
// TT is meant to be a derivative of T
template< class TT >
const_sptr( sptr_base< TT > const & other ): sptr_base< T >( other ) {}
// Retrieval
T const * get( void ) const
{ return sptr_base< T > :: get_base(); }
T const * operator -> ( void ) const
{ return get(); }
T const & operator * ( void ) const
{ return * get(); }
};
#endif
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