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diff --git a/paludis/repositories/e/e_slot_key.cc b/paludis/repositories/e/e_slot_key.cc
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+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2010 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
+ */
+
+#include <paludis/repositories/e/e_slot_key.hh>
+#include <paludis/repositories/e/eapi.hh>
+
+#include <paludis/util/singleton-impl.hh>
+#include <paludis/util/hashes.hh>
+#include <paludis/util/singleton-impl.hh>
+#include <paludis/util/pimp-impl.hh>
+
+#include <paludis/name.hh>
+
+#include <tuple>
+#include <unordered_map>
+
+using namespace paludis;
+using namespace paludis::erepository;
+
+namespace
+{
+ struct ESlotKey :
+ MetadataValueKey<SlotName>
+ {
+ const SlotName slot_value;
+ const std::shared_ptr<const EAPIMetadataVariable> variable;
+ const MetadataKeyType key_type;
+
+ ESlotKey(const SlotName & v, const std::shared_ptr<const EAPIMetadataVariable> & m, const MetadataKeyType t) :
+ slot_value(v),
+ variable(m),
+ key_type(t)
+ {
+ }
+
+ ~ESlotKey()
+ {
+ }
+
+ virtual const SlotName value() const
+ {
+ return slot_value;
+ }
+
+ virtual const std::string raw_name() const
+ {
+ return variable->name();
+ }
+
+ virtual const std::string human_name() const
+ {
+ return variable->description();
+ }
+
+ virtual MetadataKeyType type() const
+ {
+ return key_type;
+ }
+ };
+
+ typedef std::tuple<std::shared_ptr<const EAPIMetadataVariable>, std::string, MetadataKeyType> ESlotKeyStoreIndex;
+
+ struct ESlotKeyStoreHash
+ {
+ std::size_t operator() (const ESlotKeyStoreIndex & p) const
+ {
+ return
+ Hash<std::string>()(std::get<0>(p)->description()) ^
+ std::get<0>(p)->flat_list_index() ^
+ Hash<std::string>()(std::get<0>(p)->name()) ^
+ Hash<std::string>()(std::get<1>(p)) ^
+ static_cast<int>(std::get<2>(p));
+ }
+ };
+}
+
+namespace paludis
+{
+ template <>
+ struct Imp<ESlotKeyStore>
+ {
+ mutable Mutex mutex;
+ mutable std::unordered_map<ESlotKeyStoreIndex, std::shared_ptr<const ESlotKey>, ESlotKeyStoreHash> store;
+ };
+}
+
+ESlotKeyStore::ESlotKeyStore() :
+ Pimp<ESlotKeyStore>()
+{
+}
+
+ESlotKeyStore::~ESlotKeyStore() = default;
+
+const std::shared_ptr<const MetadataValueKey<SlotName> >
+ESlotKeyStore::fetch(
+ const std::shared_ptr<const EAPIMetadataVariable> & v,
+ const std::string & s,
+ const MetadataKeyType t) const
+{
+ Lock lock(_imp->mutex);
+
+ ESlotKeyStoreIndex x(v, s, t);
+ auto i(_imp->store.find(x));
+ if (i == _imp->store.end())
+ i = _imp->store.insert(std::make_pair(x, std::make_shared<const ESlotKey>(SlotName(s), v, t))).first;
+ return i->second;
+}
+