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90 lines
2.3 KiB
90 lines
2.3 KiB
/*
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Copyright (C) 2000 Stefan Westerfeld
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stefan@space.twc.de
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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*/
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#ifndef ARTS_POOL_H
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#define ARTS_POOL_H
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/*
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* BC - Status (2002-03-08): Pool<type>
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*
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* Needs to be kept binary compatible by NOT TOUCHING. When you want something
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* else, write a fresh one (used as part of Arts::Dispatcher, thus changing
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* this breaks Arts::Dispatcher binary compatibility).
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*/
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/**
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* A pool object of the type T keeps a pool of T* pointers, that are numbered.
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*
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* You allocate and release slots, and store T*'s in there. It should take
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* about no time to find a new free slot to store the T object into and to
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* release a slot to be reused.
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*
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* The pool object internally keeps track which slots are used.
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*/
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#include <stack>
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#include <vector>
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#include <list>
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namespace Arts {
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template <class T>
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class Pool {
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std::stack<unsigned long> freeIDs;
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std::vector<T *> storage;
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public:
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inline T*& operator[](unsigned long n) { return storage[n]; }
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inline void releaseSlot(unsigned long n) {
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freeIDs.push(n);
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storage[n] = 0;
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}
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unsigned long allocSlot() {
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unsigned long slot;
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if(freeIDs.empty())
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{
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unsigned long n;
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for(n=0;n<32;n++) {
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freeIDs.push(storage.size());
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storage.push_back(0);
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}
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}
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slot = freeIDs.top();
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freeIDs.pop();
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return slot;
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}
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std::list<T *> enumerate() {
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std::list<T *> items;
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//std::vector<T *>::iterator i;
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int n,max = storage.size();
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for(n=0; n < max; n++)
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if(storage[n]) items.push_back(storage[n]);
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return items;
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}
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unsigned long max() { return storage.size(); }
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};
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}
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#endif /* POOL_H */
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