Created
October 17, 2012 15:27
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| local Queue = Object:extend() | |
| continuable.Queue = Queue | |
| function Queue:initialize() | |
| self.head = {} | |
| self.tail = {} | |
| self.index = 1 | |
| self.headLength = 0 | |
| end | |
| function Queue:shift() | |
| if self.index > self.headLength then | |
| self.head, self.tail = self.tail, self.head | |
| self.index = 1 | |
| self.headLength = #self.head | |
| if self.headLength == 0 then | |
| return | |
| end | |
| } | |
| local value = self.head[self.index] | |
| self.head[self.index] = nil | |
| self.index = self.index + 1 | |
| return value | |
| end | |
| function Queue:push(item) | |
| return table.insert(self.tail, item) | |
| end |
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