Created
December 14, 2023 10:02
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type RingBuffer<'a> = private { | |
buffer: 'a option array | |
size: int | |
index: int | |
} | |
module RingBuffer = | |
open System | |
let create size = { | |
buffer = Array.create size None | |
size = size | |
index = -1 | |
} | |
let pop () ring = | |
if ring.index = -1 then | |
(None, ring) | |
else | |
let value = Array.get ring.buffer ring.index | |
let buffer = Array.copy ring.buffer | |
Array.set buffer ring.index None | |
let size = Math.Max(0, ring.size - 1) | |
let index = | |
if size = 0 then | |
- 1 | |
elif ring.index = 0 then | |
Array.length ring.buffer | |
else | |
ring.index - 1 | |
let ring = { | |
buffer = buffer | |
index = index | |
size = size | |
} | |
(value, ring) | |
let push value ring = | |
let buffer = Array.copy ring.buffer | |
let bufferLength = Array.length ring.buffer | |
let index = | |
if ring.index 1 >= bufferLength then | |
0 | |
else | |
ring.index 1 | |
Array.set buffer index (Some value) | |
let size = Math.Min(ring.size 1, bufferLength) | |
{ | |
buffer = buffer | |
index = index | |
size = size | |
} | |
let ring = | |
RingBuffer.create 2 | |
|> RingBuffer.push 1 | |
|> RingBuffer.push 2 | |
|> RingBuffer.push 3 | |
|> RingBuffer.push 4 | |
|> RingBuffer.push 5 | |
|> RingBuffer.pop () | |
|> snd | |
|> RingBuffer.push 7 | |
printfn "%A" ring |
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