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-rw-r--r--util/set.lua9
1 files changed, 9 insertions, 0 deletions
diff --git a/util/set.lua b/util/set.lua
index 7e600ebd..69dfef5d 100644
--- a/util/set.lua
+++ b/util/set.lua
@@ -52,6 +52,15 @@ local function new(list)
return items[item];
end
+ function set:contains_set(other_set)
+ for item in other_set do
+ if not self:contains(item) then
+ return false;
+ end
+ end
+ return true;
+ end
+
function set:items()
return next, items;
end