1 files changed, 29 insertions, 0 deletions
diff --git a/include/queue.lua b/include/queue.lua
new file mode 100644
index 0000000..2eb77c6
--- /dev/null
+++ b/include/queue.lua
@@ -0,0 +1,29 @@
+Queue = {}
+
+function Queue:new()
+    o = { first = 1, top = 0, data = {} }
+    self.__index = self
+    return setmetatable(o, self)
+end
+
+function Queue:push(val)
+    local top = self.top + 1
+    self.top = top
+    self.data[top] = val
+end
+
+function Queue:pop()
+    if self:empty() then
+        return nil
+    end
+    local val = self.data[self.first]
+    self.data[self.first] = nil
+    self.first = self.first + 1
+    return val
+end
+
+function Queue:empty()
+    return self.top < self.first
+end
+
+return Queue