本文介绍了如何打印类型(字符串(IO字符串))?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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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如何打印类型(字符串(IO字符串))?
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