fix #950

1 files changed, 9 insertions, 0 deletions

diff --git a/script/utility.lua b/script/utility.lua
index 66b769f1..6758a47f 100644
--- a/script/utility.lua
+++ b/script/utility.lua
@@ -23,6 +23,7 @@ local inf          = 1 / 0
 local nan          = 0 / 0
 local utf8         = utf8
 local error        = error
+local upvalueid    = debug.upvalueid
 
 _ENV = nil
 
@@ -721,4 +722,12 @@ function m.stringEndWith(str, tail)
     return str:sub(-#tail) == tail
 end
 
+function m.defaultTable(default)
+    return setmetatable({}, { __index = function (t, k)
+        local v = default(k)
+        t[k] = v
+        return v
+    end })
+end
+
 return m