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+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015-2019 Matthias Beyer <mail@beyermatthias.de> and contributors
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; version
+// 2.1 of the License.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+//
+
+/// Helper type for handling message IDs
+///
+/// Message IDs are used to identfy emails uniquely, so we should at least have a type for
+/// representing them and make handling a bit easier.
+///
+#[derive(Debug, Hash, PartialEq, Eq, PartialOrd, Ord)]
+pub struct MessageId(String);
+
+impl Into<String> for MessageId {
+ fn into(self) -> String {
+ self.0
+ }
+}
+