async_pointer.nim

import asyncdispatch, asyncnet

type
  AsyncStream* = ref AsyncStreamObj
  AsyncStreamObj* = object of RootObj
    closeImpl*: proc (s: AsyncStream)
    atEndImpl*: proc (s: AsyncStream): bool
    setPositionImpl*: proc (s: AsyncStream; pos: int64)
    getPositionImpl*: proc (s: AsyncStream): int64
    readDataImpl*: proc (s: AsyncStream; size: int): Future[string] {.tags: [ReadIOEffect].}
    writeDataImpl*: proc (s: AsyncStream; data: string): Future[void] {.tags: [WriteIOEffect].}
    flushImpl*: proc (s: AsyncStream): Future[void]

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# AsyncStream

proc readChar*(s: AsyncStream): Future[char] {.async.} =
  let data = await s.readDataImpl(s, 1)
  result = if data.len == 0: '\0' else: data[0]