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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_IMPL_HH
+#define PALUDIS_GUARD_PALUDIS_UTIL_POOL_IMPL_HH 1
+
+#include <paludis/util/pool.hh>
+#include <paludis/util/mutex.hh>
+#include <paludis/util/hashes.hh>
+#include <unordered_map>
+#include <memory>
+
+namespace paludis
+{
+ template <typename Arg_, typename... Args_>
+ void
+ PoolKeys::add(const Arg_ & arg, const Args_ & ... args)
+ {
+ add_one(std::make_shared<ConcretePoolKey<Arg_> >(arg));
+ add(args...);
+ }
+
+ template <typename T_>
+ struct Imp<Pool<T_> >
+ {
+ mutable Mutex mutex;
+ mutable std::unordered_map<PoolKeys, std::shared_ptr<const T_>, PoolKeysHasher, PoolKeysComparator> store;
+ };
+
+ template <typename T_>
+ Pool<T_>::Pool() :
+ _imp()
+ {
+ }
+
+ template <typename T_>
+ Pool<T_>::~Pool() = default;
+
+ template <typename T_>
+ struct PreventConversion
+ {
+ const T_ & ref;
+
+ PreventConversion(const T_ & r) :
+ ref(r)
+ {
+ }
+
+ operator const T_ & ()
+ {
+ return ref;
+ }
+ };
+
+ template <typename T_>
+ template <typename... Args_>
+ const std::shared_ptr<const T_>
+ Pool<T_>::create(Args_ ... args) const
+ {
+ PoolKeys keys;
+ keys.add(args...);
+
+ Lock lock(_imp->mutex);
+ auto i(_imp->store.find(keys));
+ if (i == _imp->store.end())
+ i = _imp->store.insert(std::make_pair(keys, std::make_shared<const T_>(PreventConversion<Args_>(args)...))).first;
+
+ return i->second;
+ }
+
+ template <typename T_>
+ ConcretePoolKey<T_>::ConcretePoolKey(const T_ & t) :
+ PoolKey(PoolKeyTypeCodes::get<T_>()),
+ _value(t)
+ {
+ }
+
+ template <typename T_>
+ ConcretePoolKey<T_>::~ConcretePoolKey() = default;
+
+ template <typename T_>
+ std::size_t
+ ConcretePoolKey<T_>::hash() const
+ {
+ return Hash<T_>()(_value);
+ }
+
+ template <typename T_>
+ bool
+ ConcretePoolKey<T_>::same_value(const PoolKey & other) const
+ {
+ return _value == static_cast<const ConcretePoolKey<T_> &>(other)._value;
+ }
+
+ template <typename T_>
+ int
+ PoolKeyTypeCodes::get()
+ {
+ static int result(next());
+ return result;
+ }
+}
+
+#endif