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/**
* @file llinstancetracker.h
* @brief LLInstanceTracker is a mixin class that automatically tracks object
* instances with or without an associated key
*
* $LicenseInfo:firstyear=2000&license=viewergpl$
*
* Copyright (c) 2000-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLINSTANCETRACKER_H
#define LL_LLINSTANCETRACKER_H
#include <map>
#include "string_table.h"
#include <boost/utility.hpp>
#include <boost/function.hpp>
#include <boost/bind.hpp>
#include <boost/iterator/transform_iterator.hpp>
#include <boost/iterator/indirect_iterator.hpp>
/// This mix-in class adds support for tracking all instances of the specified class parameter T
/// The (optional) key associates a value of type KEY with a given instance of T, for quick lookup
/// If KEY is not provided, then instances are stored in a simple set
/// @NOTE: see explicit specialization below for default KEY==T* case
template<typename T, typename KEY = T*>
class LLInstanceTracker : boost::noncopyable
{
typedef typename std::map<KEY, T*> InstanceMap;
typedef boost::function<const KEY&(typename InstanceMap::value_type&)> KeyGetter;
typedef boost::function<T*(typename InstanceMap::value_type&)> InstancePtrGetter;
public:
/// Dereferencing key_iter gives you a const KEY&
typedef boost::transform_iterator<KeyGetter, typename InstanceMap::iterator> key_iter;
/// Dereferencing instance_iter gives you a T&
typedef boost::indirect_iterator< boost::transform_iterator<InstancePtrGetter, typename InstanceMap::iterator> > instance_iter;
static T* getInstance(const KEY& k)
{
typename InstanceMap::const_iterator found = getMap_().find(k);
return (found == getMap_().end()) ? NULL : found->second;
}
static key_iter beginKeys()
{
return boost::make_transform_iterator(getMap_().begin(),
boost::bind(&InstanceMap::value_type::first, _1));
}
static key_iter endKeys()
{
return boost::make_transform_iterator(getMap_().end(),
boost::bind(&InstanceMap::value_type::first, _1));
}
static instance_iter beginInstances()
{
return instance_iter(boost::make_transform_iterator(getMap_().begin(),
boost::bind(&InstanceMap::value_type::second, _1)));
}
static instance_iter endInstances()
{
return instance_iter(boost::make_transform_iterator(getMap_().end(),
boost::bind(&InstanceMap::value_type::second, _1)));
}
static S32 instanceCount() { return getMap_().size(); }
protected:
LLInstanceTracker(KEY key) { add_(key); }
virtual ~LLInstanceTracker() { remove_(); }
virtual void setKey(KEY key) { remove_(); add_(key); }
virtual const KEY& getKey() const { return mKey; }
private:
void add_(KEY key)
{
mKey = key;
getMap_()[key] = static_cast<T*>(this);
}
void remove_() { getMap_().erase(mKey); }
static InstanceMap& getMap_()
{
if (! sInstances)
{
sInstances = new InstanceMap;
}
return *sInstances;
}
private:
KEY mKey;
static InstanceMap* sInstances;
};
/// explicit specialization for default case where KEY is T*
/// use a simple std::set<T*>
template<typename T>
class LLInstanceTracker<T, T*>
{
typedef typename std::set<T*> InstanceSet;
public:
/// Dereferencing key_iter gives you a T* (since T* is the key)
typedef typename InstanceSet::iterator key_iter;
/// Dereferencing instance_iter gives you a T&
typedef boost::indirect_iterator<key_iter> instance_iter;
/// for completeness of analogy with the generic implementation
static T* getInstance(T* k) { return k; }
static key_iter beginKeys() { return getSet_().begin(); }
static key_iter endKeys() { return getSet_().end(); }
static instance_iter beginInstances() { return instance_iter(getSet_().begin()); }
static instance_iter endInstances() { return instance_iter(getSet_().end()); }
static S32 instanceCount() { return getSet_().size(); }
protected:
LLInstanceTracker() { getSet_().insert(static_cast<T*>(this)); }
virtual ~LLInstanceTracker() { getSet_().erase(static_cast<T*>(this)); }
LLInstanceTracker(const LLInstanceTracker& other) { getSet_().insert(static_cast<T*>(this)); }
static InstanceSet& getSet_() // called after getReady() but before go()
{
if (! sInstances)
{
sInstances = new InstanceSet;
}
return *sInstances;
}
static InstanceSet* sInstances;
};
template <typename T, typename KEY> typename LLInstanceTracker<T, KEY>::InstanceMap* LLInstanceTracker<T, KEY>::sInstances = NULL;
template <typename T> typename LLInstanceTracker<T, T*>::InstanceSet* LLInstanceTracker<T, T*>::sInstances = NULL;
#endif
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