如何打印类型（字符串（IO字符串））？ [英] How to print the type (Either String (IO String))?

问题描述

这是一个非常非常长的故事，我不会让你感到厌烦，但基本上，我设法让自己处于一种需要能够打印类型的情况。字符串（IO字符串）。任何帮助？

解决方案

解决方案是一个单线程....

  print（print =<）
  

如果你想划分它是 Left 还是 Right 则需要更多介入，请参阅@ jamsihdh的答案。

请注意，这不能作为 Show 实例，因为对于类型 IO a 。

It's a very, very long story, and I won't bore you with it, but basically, I managed to get myself in a situation in which I need to be able to print the type Either String (IO String). Any help?

解决方案

The solution is a one liner....

either print (print =<<)

If you want to demarcate whether it was Left or Right it's a bit more involved, see @jamsihdh's answer.

Note that this cannot be made a Show instance, since nothing can be purely observed about values of type IO a.

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