Jason Felds
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/* SubscriptionManager - Object that accepts subscriptions. */
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#ifndef SubscriptionManager_H
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#define SubscriptionManager_H
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#include <set>
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// Since this class has only POD types and no constructor, there's no
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// initialize order problem.
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template<class T>
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class SubscriptionManager
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{
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public:
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// TRICKY: If we make this a global instead of a global pointer,
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// then we'd have to be careful that the static constructors of all
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// subscribers are called before the collection constructor. It's
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// impossible to enfore that in C++. Instead, we'll allocate the
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// collection ourself on first use. SubscriptionHandler itself is
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// a POD type, so a static SubscriptionHandler will always have
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// m_pSubscribers == NULL (before any static constructors are called).
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set<T*>* m_pSubscribers;
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// Use this to access m_pSubscribers, so you don't have to worry about
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// it being NULL.
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set<T*> &Get()
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{
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if( m_pSubscribers == NULL )
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m_pSubscribers = new set<T*>;
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return *m_pSubscribers;
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}
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void Subscribe( T* p )
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{
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if( m_pSubscribers == NULL )
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m_pSubscribers = new set<T*>;
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#ifdef DEBUG
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typename set<T*>::iterator iter = m_pSubscribers->find( p );
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ASSERT_M( iter == m_pSubscribers->end(), "already subscribed" );
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#endif
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m_pSubscribers->insert( p );
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}
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void Unsubscribe( T* p )
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{
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typename set<T*>::iterator iter = m_pSubscribers->find( p );
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ASSERT( iter != m_pSubscribers->end() );
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m_pSubscribers->erase( iter );
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}
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};
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#endif
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/*
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* (c) 2004-2005 Chris Danford
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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