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//------------------------------------------------------------------------------
// This file is part of the OpenStructure project <www.openstructure.org>
//
// Copyright (C) 2008-2020 by the OpenStructure authors
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the Free
// Software Foundation; either version 3.0 of the License, or (at your option)
// any later version.
// This library 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 Lesser General Public License for more
// details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this library; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//------------------------------------------------------------------------------
#ifndef OST_GUI_QPTR_HH
#define OST_GUI_QPTR_HH
#include <iostream>
/*
Author: Marco Biasini
*/
namespace ost { namespace gui {
/// \brief storage class for exporting objects to Python that use the
/// hierarchical memory management mechanism of Qt.
template <typename T>
class QPtr
{
public:
typedef T element_type;
typedef T value_type;
typedef T* pointer_type;
public:
template <typename P> friend class QPtr;
QPtr(): ptr_(NULL), master_(true), released_(new bool(false))
{ }
QPtr(T* ptr): ptr_(ptr), master_(true), released_(new bool(false))
{
}
void swap(QPtr<T>& rhs)
{
std::swap(ptr_, rhs.ptr_);
std::swap(master_, rhs.master_);
std::swap(released_, rhs.released_);
}
template <typename P>
QPtr(QPtr<P>& rhs): ptr_(rhs.get()), master_(false),
released_(rhs.released_)
{ }
void Release()
{
*released_=true;
}
bool IsReleased() const
{
return (*released_)==true;
}
pointer_type get()
{
return ptr_;
}
const pointer_type get() const
{
return ptr_;
}
~QPtr()
{
if (!master_) {
return;
}
if ((*released_)==false && ptr_) {
delete ptr_;
ptr_=NULL;
}
delete released_;
}
operator bool() const
{
return ptr_!=NULL;
}
private:
pointer_type ptr_;
bool master_;
bool* released_;
};
template <typename T>
T* get_pointer(QPtr<T>& rhs)
{
return rhs.get();
}
template <typename T>
const T* get_pointer(const QPtr<T>& rhs)
{
return rhs.get();
}
}}
#endif
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