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AppFwk: Add a guarded interface pointer class
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//##################################################################################################
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//
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// Custom Visualization Core library
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// Copyright (C) 2018 Ceetron Solutions AS
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//
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// This library may be used under the terms of either the GNU General Public License or
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// the GNU Lesser General Public License as follows:
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//
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// GNU General Public License Usage
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// This library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
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// for more details.
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//
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// GNU Lesser General Public License Usage
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
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// for more details.
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//
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//##################################################################################################
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#pragma once
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#include "cafPdmPointer.h"
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namespace caf
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{
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template<class T>
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class PdmInterfacePointer
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{
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public:
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inline PdmInterfacePointer () : m_iface(nullptr) { }
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inline PdmInterfacePointer ( T * iface ) { *this = iface; }
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inline PdmInterfacePointer ( const PdmInterfacePointer<T> & other ) { *this = other.p();}
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T* p() const
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{
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if ( m_implementingPdmObject.notNull() )
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{
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return m_iface;
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}
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else
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{
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return nullptr;
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}
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}
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PdmInterfacePointer<T> & operator= ( T* iface )
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{
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m_implementingPdmObject = nullptr;
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m_iface = nullptr;
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if ( iface != nullptr )
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{
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m_implementingPdmObject = iface->implementingPdmObject();
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m_iface = iface;
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}
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return *this;
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}
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bool isNull() const { return m_implementingPdmObject.isNull(); }
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bool notNull() const { return m_implementingPdmObject.notNull(); }
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operator T* () const { return p(); }
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T* operator->() const { return p(); }
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PdmInterfacePointer<T> & operator= ( const PdmInterfacePointer<T>& other ) { return *this = other.p();}
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private:
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T* m_iface;
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PdmPointer<caf::PdmObjectHandle> m_implementingPdmObject;
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};
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}
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