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#ifndef GLW_BOOKKEEPING_H
#define GLW_BOOKKEEPING_H
#include "./common.h"
namespace glw
{
namespace detail
{
struct NoType { };
template <typename T> struct DefaultDeleter { void operator () (T * t) { delete t; } };
template <typename T> struct BaseOf { typedef NoType Type; };
template <typename T, typename B> struct RootOfType { typedef typename RootOfType<B, typename BaseOf<B>::Type>::Type Type; };
template <typename T> struct RootOfType<T, NoType> { typedef T Type; };
template <typename T> struct RootOf { typedef typename RootOfType<T, typename BaseOf<T>::Type>::Type Type; };
template <typename T, typename B> struct DeleterOfType { typedef typename DeleterOfType<B, typename BaseOf<B>::Type>::Type Type; };
template <typename T> struct DeleterOfType<T, NoType> { typedef DefaultDeleter<T> Type; };
template <typename T> struct DeleterOf { typedef typename DeleterOfType<T, typename BaseOf<T>::Type>::Type Type; };
template <typename TObject, typename TDeleter, typename TBaseObject>
class RefCountedObject : public RefCountedObject<TBaseObject, TDeleter, typename BaseOf<TBaseObject>::Type>
{
public:
typedef RefCountedObject<TBaseObject, TDeleter, typename BaseOf<TBaseObject>::Type> BaseType;
typedef RefCountedObject<TObject, TDeleter, TBaseObject> ThisType;
typedef TObject ObjectType;
typedef TDeleter DeleterType;
typedef TBaseObject BaseObjectType;
RefCountedObject(ObjectType * object, const DeleterType & deleter)
: BaseType(object, deleter)
{
;
}
const ObjectType * object(void) const
{
return static_cast<const ObjectType *>(BaseType::object());
}
ObjectType * object(void)
{
return static_cast<ObjectType *>(BaseType::object());
}
};
template <typename TObject, typename TDeleter>
class RefCountedObject<TObject, TDeleter, NoType>
{
public:
typedef void BaseType;
typedef RefCountedObject<TObject, TDeleter, NoType> ThisType;
typedef TObject ObjectType;
typedef TDeleter DeleterType;
typedef NoType BaseObjectType;
RefCountedObject(ObjectType * object, const DeleterType & deleter)
: m_object (object)
, m_refCount (0)
, m_deleter (deleter)
{
GLW_ASSERT(this->m_object != 0);
}
~RefCountedObject(void)
{
this->destroyObject();
}
bool isNull(void) const
{
return (this->m_object == 0);
}
void setNull(bool deleteObject)
{
if (deleteObject)
{
this->destroyObject();
}
this->m_object = 0;
}
const ObjectType * object(void) const
{
return this->m_object;
}
ObjectType * object(void)
{
return this->m_object;
}
const DeleterType & deleter(void) const
{
return this->m_deleter;
}
DeleterType & deleter(void)
{
return this->m_deleter;
}
void ref(void)
{
this->m_refCount++;
}
void unref(void)
{
GLW_ASSERT(this->m_refCount > 0);
this->m_refCount--;
if (this->m_refCount == 0)
{
delete this;
}
}
int refCount(void) const
{
return this->m_refCount;
}
private:
ObjectType * m_object;
int m_refCount;
DeleterType m_deleter;
RefCountedObject(const ThisType & other);
ThisType & operator = (const ThisType & other);
void destroyObject(void)
{
if (this->m_object == 0) return;
this->m_deleter(this->m_object);
this->m_object = 0;
}
};
template <typename T> struct RefCountedObjectTraits { typedef RefCountedObject<T, typename DeleterOf<T>::Type, typename BaseOf<T>::Type> Type; };
template <typename TObject, typename TDeleter, typename TBaseObject>
class ObjectSharedPointer : public ObjectSharedPointer<TBaseObject, TDeleter, typename BaseOf<TBaseObject>::Type>
{
public:
typedef ObjectSharedPointer<TBaseObject, TDeleter, typename BaseOf<TBaseObject>::Type> BaseType;
typedef ObjectSharedPointer<TObject, TDeleter, TBaseObject> ThisType;
typedef TObject ObjectType;
typedef TDeleter DeleterType;
typedef TBaseObject BaseObjectType;
typedef RefCountedObject<ObjectType, DeleterType, BaseObjectType> RefCountedObjectType;
ObjectSharedPointer(void)
: BaseType()
{
;
}
ObjectSharedPointer(const ThisType & other)
: BaseType(other)
{
;
}
ObjectSharedPointer(RefCountedObjectType * refObject)
: BaseType(refObject)
{
;
}
const ObjectType & operator * (void) const
{
return (*(this->object()));
}
ObjectType & operator * (void)
{
return (*(this->object()));
}
const ObjectType * operator -> (void) const
{
return this->object();
}
ObjectType * operator -> (void)
{
return this->object();
}
protected:
const ObjectType * object(void) const
{
return static_cast<const ObjectType *>(BaseType::object());
}
ObjectType * object(void)
{
return static_cast<ObjectType *>(BaseType::object());
}
RefCountedObjectType * refObject(void) const
{
return static_cast<RefCountedObjectType *>(BaseType::refObject());
}
};
template <typename TObject, typename TDeleter>
class ObjectSharedPointer<TObject, TDeleter, NoType>
{
public:
typedef void BaseType;
typedef ObjectSharedPointer<TObject, TDeleter, NoType> ThisType;
typedef TObject ObjectType;
typedef TDeleter DeleterType;
typedef NoType BaseObjectType;
typedef RefCountedObject<ObjectType, DeleterType, NoType> RefCountedObjectType;
ObjectSharedPointer(void)
: m_refObject(0)
{
;
}
ObjectSharedPointer(const ThisType & other)
: m_refObject(0)
{
this->attach(other.refObject());
}
ObjectSharedPointer(RefCountedObjectType * refObject)
: m_refObject(0)
{
this->attach(refObject);
}
~ObjectSharedPointer(void)
{
this->detach();
}
bool isNull(void) const
{
if (this->m_refObject == 0) return true;
return this->m_refObject->isNull();
}
void setNull(void)
{
this->detach();
}
const ObjectType & operator * (void) const
{
return (*(this->object()));
}
ObjectType & operator * (void)
{
return (*(this->object()));
}
const ObjectType * operator -> (void) const
{
return this->object();
}
ObjectType * operator -> (void)
{
return this->object();
}
operator bool (void) const
{
return (!this->isNull());
}
ThisType & operator = (const ThisType & other)
{
this->attach(other.refObject());
return (*this);
}
protected:
const ObjectType * object(void) const
{
GLW_ASSERT(!this->isNull());
return this->m_refObject->object();
}
ObjectType * object(void)
{
GLW_ASSERT(!this->isNull());
return this->m_refObject->object();
}
RefCountedObjectType * refObject(void) const
{
return this->m_refObject;
}
private:
RefCountedObjectType * m_refObject;
void attach(RefCountedObjectType * reObject)
{
this->detach();
this->m_refObject = reObject;
if (this->m_refObject != 0)
{
this->m_refObject->ref();
}
}
void detach(void)
{
if (this->m_refObject == 0) return;
this->m_refObject->unref();
this->m_refObject = 0;
}
};
template <typename T> struct ObjectSharedPointerTraits { typedef ObjectSharedPointer<T, typename DeleterOf<typename RootOf<T>::Type>::Type, typename BaseOf<T>::Type> Type; };
};
};
#endif // GLW_BOOKKEEPING_H
|
