/usr/include/lttoolbox-3.1/lttoolbox/pool.h is in liblttoolbox3-3.1-0-dev 3.1.0-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2005 Universitat d'Alacant / Universidad de Alicante
*
* 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., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef _GENERIC_POOL_
#define _GENERIC_POOL_
#include <list>
using namespace std;
/**
* Pool of T objects
*/
template <class T>
class Pool
{
private:
/**
* Free pointers to objects
*/
list<T *> free;
/**
* Currently created objects
*/
list<T> created;
/**
* copy method
* @param other pool object
*/
void copy(Pool const &p)
{
created = p.created;
// all new members are available
for(typename list<T>::iterator it = created.begin(), limit = created.end();
it != limit; it++)
{
free.push_back(&(*it));
}
}
/**
* destroy method
*/
void destroy()
{
// do nothing
}
/**
* Allocate a pool of nelems size
* @param nelems initial size of the pool
*/
void init(unsigned int const nelems)
{
created.clear();
free.clear();
T tmp;
for(unsigned int i = 0; i != nelems; i++)
{
created.push_front(tmp);
free.push_front(&(*(created.begin())));
}
}
/**
* Allocate a pool of nelems size with objects equal to 'object'
* @param nelems initial size of the pool
* @param object initial value of the objects in the pool
*/
void init(unsigned int const nelems, T const &object)
{
created.clear();
free.clear();
for(unsigned int i = 0; i != nelems; i++)
{
created.push_front(object);
free.push_front(&(*(created.begin())));
}
}
public:
/**
* Constructor
*/
Pool()
{
init(1);
}
/**
* Parametrized constructor
* @param nelems initial size of the pool
* @param object initial value of the objects in the pool
*/
Pool(unsigned int const nelems, T const &object)
{
init(nelems, object);
}
/**
* Parametrized constructor
* @param nelems initial size of the pool
*/
Pool(unsigned int const nelems)
{
init(nelems);
}
/**
* Destructor
*/
~Pool()
{
destroy();
}
/**
* Copy constructor
*/
Pool(Pool const &p)
{
copy(p);
}
/**
* Allocate a pointer to a free 'new' object.
* @return pointer to the object
*/
T * get()
{
if(free.size() != 0)
{
T *result = *(free.begin());
free.erase(free.begin());
return result;
}
else
{
T tmp;
created.push_front(tmp);
return &(*(created.begin()));
}
}
/**
* Release a no more needed instance of a pooled object
* @param item the no more needed instance of the object
*/
void release(T *item)
{
free.push_front(item);
}
};
#endif
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