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queue.lua
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queue.lua
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Class = require 'hump.class'
Queue = Class
{
name = "Queue",
function(self)
self.data = {}
self.data.n = 0
self.head = 0
self.tail = 0
end
}
function Queue:push(obj)
self.data[self.tail] = obj
self.data.n = self.data.n + 1
self.tail = self.tail + 1
end
function Queue:pop()
if self.data.n <= 0 then
return nil
end
local result = self.data[self.head]
self.data[self.head] = nil
self.data.n = self.data.n - 1
self.head = self.head + 1
if self.data.n <= 0 then
self.head = 0
self.tail = 0
end
return result
end
function Queue:peek()
if self.data.n <= 0 then
return nil
else
return self.data[self.head]
end
end
function Queue:size()
return self.data.n
end