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diff --git a/paludis/resolver/find_replacing_helper.cc b/paludis/resolver/find_replacing_helper.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/resolver/find_replacing_helper.hh>
+#include <paludis/resolver/same_slot.hh>
+#include <paludis/util/pimp-impl.hh>
+#include <paludis/util/make_shared_copy.hh>
+#include <paludis/util/make_named_values.hh>
+#include <paludis/util/stringify.hh>
+#include <paludis/package_id.hh>
+#include <paludis/partially_made_package_dep_spec.hh>
+#include <paludis/elike_slot_requirement.hh>
+#include <paludis/metadata_key.hh>
+#include <paludis/repository.hh>
+#include <paludis/package_database.hh>
+#include <paludis/environment.hh>
+#include <paludis/generator.hh>
+#include <paludis/filtered_generator.hh>
+#include <paludis/filter.hh>
+#include <paludis/selection.hh>
+#include <set>
+
+using namespace paludis;
+using namespace paludis::resolver;
+
+namespace paludis
+{
+ template <>
+ struct Imp<FindReplacingHelper>
+ {
+ const Environment * const env;
+
+ Imp(const Environment * const e) :
+ env(e)
+ {
+ }
+ };
+}
+
+FindReplacingHelper::FindReplacingHelper(const Environment * const e) :
+ Pimp<FindReplacingHelper>(e)
+{
+}
+
+FindReplacingHelper::~FindReplacingHelper() = default;
+
+const std::shared_ptr<const PackageIDSequence>
+FindReplacingHelper::operator() (
+ const std::shared_ptr<const PackageID> & id,
+ const std::shared_ptr<const Repository> & repo) const
+{
+ Context context("When working out what is replaced by '" + stringify(*id) +
+ "' when it is installed to '" + stringify(repo->name()) + "':");
+
+ std::set<RepositoryName> repos;
+
+ if (repo->installed_root_key())
+ {
+ for (PackageDatabase::RepositoryConstIterator r(_imp->env->package_database()->begin_repositories()),
+ r_end(_imp->env->package_database()->end_repositories()) ;
+ r != r_end ; ++r)
+ if ((*r)->installed_root_key() &&
+ (*r)->installed_root_key()->value() == repo->installed_root_key()->value())
+ repos.insert((*r)->name());
+ }
+ else
+ repos.insert(repo->name());
+
+ std::shared_ptr<PackageIDSequence> result(std::make_shared<PackageIDSequence>());
+ for (std::set<RepositoryName>::const_iterator r(repos.begin()),
+ r_end(repos.end()) ;
+ r != r_end ; ++r)
+ {
+ std::shared_ptr<const PackageIDSequence> ids((*_imp->env)[selection::AllVersionsUnsorted(
+ generator::Package(id->name()) & generator::InRepository(*r))]);
+ for (PackageIDSequence::ConstIterator i(ids->begin()), i_end(ids->end()) ;
+ i != i_end ; ++i)
+ {
+ if ((*i)->version() == id->version() || (same_slot(*i, id) && repo->installed_root_key()))
+ result->push_back(*i);
+ }
+ }
+
+ return result;
+}
+
+template class Pimp<FindReplacingHelper>;
+