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+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2011 Ciaran McCreesh
+ *
+ * This file is part of the Paludis package manager. Paludis is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * Paludis 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 PALUDIS_GUARD_PALUDIS_UTIL_POOL_HH
+#define PALUDIS_GUARD_PALUDIS_UTIL_POOL_HH 1
+
+#include <paludis/util/singleton.hh>
+#include <paludis/util/pimp.hh>
+#include <memory>
+
+namespace paludis
+{
+ class PoolKeysHasher;
+ class PoolKeysComparator;
+
+ template <typename T_>
+ class PALUDIS_VISIBLE Pool :
+ public Singleton<Pool<T_> >
+ {
+ friend class Singleton<Pool<T_> >;
+
+ private:
+ Pimp<Pool<T_> > _imp;
+
+ Pool();
+ ~Pool();
+
+ public:
+ template <typename... Args_>
+ const std::shared_ptr<const T_> create(Args_ ...) const PALUDIS_ATTRIBUTE((warn_unused_result));
+ };
+
+ class PALUDIS_VISIBLE PoolKey
+ {
+ private:
+ int _tc;
+
+ protected:
+ explicit PoolKey(int tc);
+
+ virtual bool same_value(const PoolKey &) const = 0;
+
+ public:
+ virtual ~PoolKey() = 0;
+
+ virtual std::size_t hash() const = 0;
+
+ bool same_type_and_value(const PoolKey &) const;
+ };
+
+ template <typename T_>
+ class PALUDIS_VISIBLE ConcretePoolKey :
+ public PoolKey
+ {
+ friend class PoolKeysHasher;
+ friend class PoolKeysComparator;
+
+ private:
+ T_ _value;
+
+ public:
+ explicit ConcretePoolKey(const T_ &);
+
+ virtual ~ConcretePoolKey();
+
+ virtual std::size_t hash() const;
+
+ bool same_value(const PoolKey &) const;
+ };
+
+ class PALUDIS_VISIBLE PoolKeys
+ {
+ friend class PoolKeysHasher;
+ friend class PoolKeysComparator;
+
+ private:
+ Pimp<PoolKeys> _imp;
+
+ void add_one(const std::shared_ptr<const PoolKey> &);
+ void add();
+
+ public:
+ PoolKeys();
+ PoolKeys(const PoolKeys &);
+ ~PoolKeys();
+
+ template <typename Arg_, typename... Args_>
+ void add(const Arg_ &, const Args_ & ...);
+ };
+
+ class PALUDIS_VISIBLE PoolKeysHasher
+ {
+ public:
+ std::size_t operator() (const PoolKeys &) const PALUDIS_VISIBLE;
+ };
+
+ class PALUDIS_VISIBLE PoolKeysComparator
+ {
+ public:
+ bool operator() (const PoolKeys &, const PoolKeys &) const PALUDIS_VISIBLE;
+ };
+
+ class PALUDIS_VISIBLE PoolKeyTypeCodes
+ {
+ private:
+ static int next();
+
+ public:
+ template <typename T_>
+ static int get();
+ };
+
+ extern template class Pimp<PoolKeys>;
+}
+
+#endif