Pool

1 files changed, 132 insertions, 0 deletions

diff --git a/paludis/util/pool.hh b/paludis/util/pool.hh
new file mode 100644
index 000000000..58e919b38
--- /dev/null
+++ b/paludis/util/pool.hh
@@ -0,0 +1,132 @@
+/* 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