Question

我最近开始从https://learnyousomeerlang.com学习Erlang 在errors and processes这一章中，我了解了程序的功能以及如何执行，但是我无法弄清楚此函数的目的是什么，何时以及如何调用此函数？

据我了解，如果元组模式与Pid和atom匹配，它将返回一个atom。我将如何发送消息以接收内部法官？

print(f"Some text and a {value}")

输出

  start_critic() ->
  spawn(?MODULE, critic, []).

judge(Pid, Band, Album) ->
  Pid ! {self(), {Band, Album}},
  receive 
    {Pid, Criticism} -> Criticism
  after 2000 ->
    timeout
  end.

critic() ->
  receive
    {From, {"Rage Against the Turing Machine", "Unit Testify"}} ->
      From ! {self(), "They are great!"};
    {From, {"System of a Downtime", "Memoize"}} ->
      From ! {self(), "They're not Johnny Crash but they're good."};
    {From, {"Johnny Crash", "The Token Ring of Fire"}} ->
      From ! {self(), "Simply incredible."};
    {From, {_Band, _Album}} ->
      From ! {self(), "They are terrible!"}
  end,
  critic().

Answer 1

第Pid ! ...行向评论者发送消息。评论者然后将通过From ! ...行之一发送回复。 receive函数中的judge等待所述响应，然后简单地返回响应中包含的字符串。

这个判断函数接收语句fullfil的目的是什么？

1 个答案: