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-rw-r--r--sync/api/attachments/attachment_id.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/sync/api/attachments/attachment_id.h b/sync/api/attachments/attachment_id.h
index 1c53355..039d386 100644
--- a/sync/api/attachments/attachment_id.h
+++ b/sync/api/attachments/attachment_id.h
@@ -75,6 +75,8 @@ class SYNC_EXPORT AttachmentId {
AttachmentId(sync_pb::AttachmentIdProto* proto);
};
+// All public interfaces use AttachmentIdList. AttachmentIdSet is used in
+// implementations of algorithms where set properties are needed.
typedef std::vector<AttachmentId> AttachmentIdList;
typedef std::set<AttachmentId> AttachmentIdSet;