埃尔朗期货与承诺 [英] Futures and Promises in Erlang

问题描述

Erlang是否具有未来与承诺的等同内容？或者由于未来和承诺正在解决Erlang系统中不存在的问题（例如同步编排），因此我们不需要Erlang。

Does Erlang has equivalents for Future and Promises? Or since future and promises are solving a problem that doesn't exist in Erlang systems (synchronisation orchestrating for example), and hence we don't need them in Erlang.

如果我想要Erlang的期货和承诺的语义，可以通过Erlang流程/行为者来模拟？

If I want the semantics of futures and promises in Erlang, they could be emulated via Erlang processes/actors?

推荐答案

您可以轻松实现Erlang的未来：

You could easily implement a future in Erlang like this:

F = fun() -> fancy_function() end,

% fancy code

Pid = self(),
Other = spawn(fun() -> X = F(), Pid ! {future, self(), X} end).

% more fancy code

Value = receive {future, Other, Val} -> Val end.

在模块中建立这个功能并从中构建链接也很简单，但是说实话从来没有想过这样的东西。如果您只是自由地发送消息，你会更灵活。

Having this functionality in a module and building chains from it should be easy too, but to be honest I never actually missed something like this. You are more flexible if you just freely send messages around.

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