icinga2/lib/base/object.h

151 lines
4.0 KiB
C++

/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#ifndef OBJECT_H
#define OBJECT_H
namespace icinga
{
class SharedPtrHolder;
/**
* Base class for all heap-allocated objects. At least one of its methods
* has to be virtual for RTTI to work.
*
* @ingroup base
*/
class I2_BASE_API Object : public enable_shared_from_this<Object>, public boost::signals::trackable
{
public:
typedef shared_ptr<Object> Ptr;
typedef weak_ptr<Object> WeakPtr;
void Hold(void);
static void ClearHeldObjects(void);
/**
* Holds a shared pointer and provides support for implicit upcasts.
*
* @ingroup base
*/
class SharedPtrHolder
{
public:
/**
* Constructor for the SharedPtrHolder class.
*
* @param object The shared pointer that should be used to
* construct this shared pointer holder.
*/
explicit SharedPtrHolder(const Object::Ptr& object)
: m_Object(object)
{ }
/**
* Retrieves a shared pointer for the object that is associated
* this holder instance.
*
* @returns A shared pointer.
*/
template<typename T>
operator shared_ptr<T>(void) const
{
#ifdef _DEBUG
shared_ptr<T> other = dynamic_pointer_cast<T>(m_Object);
assert(other);
#else /* _DEBUG */
shared_ptr<T> other = static_pointer_cast<T>(m_Object);
#endif /* _DEBUG */
return other;
}
/**
* Retrieves a weak pointer for the object that is associated
* with this holder instance.
*
* @returns A weak pointer.
*/
template<typename T>
operator weak_ptr<T>(void) const
{
return static_cast<shared_ptr<T> >(*this);
}
private:
Object::Ptr m_Object; /**< The object that belongs to this
holder instance */
};
SharedPtrHolder GetSelf(void);
#ifdef _DEBUG
static int GetAliveObjectsCount(void);
static void PrintMemoryProfile(void);
#endif /* _DEBUG */
protected:
Object(void);
virtual ~Object(void);
private:
Object(const Object& other);
Object& operator=(const Object& rhs);
static boost::mutex *GetMutex(void);
static set<Object *> *GetAliveObjects(void);
static vector<Object::Ptr>& GetHeldObjects(void);
};
/**
* Compares a weak pointer with a raw pointer.
*
* @ingroup base
*/
template<class T>
struct WeakPtrEqual
{
private:
const void *m_Ref; /**< The object. */
public:
/**
* Constructor for the WeakPtrEqual class.
*
* @param ref The object that should be compared with the weak pointer.
*/
WeakPtrEqual(const void *ref) : m_Ref(ref) { }
/**
* Compares the two pointers.
*
* @param wref The weak pointer.
* @returns true if the pointers point to the same object, false otherwise.
*/
bool operator()(const weak_ptr<T>& wref) const
{
return (wref.lock().get() == static_cast<const T *>(m_Ref));
}
};
}
#endif /* OBJECT_H */