This data structure comes from the Wikipedia page on mutual recursion, which itself cites course notes from an introduction to Standard ML by Robert Harper. I am not aware of practical reasons to choose this particular representation of trees over the alternatives, other than as an illustration of a language’s ability to support mutually recursive data. I find it unwieldy, which is why I chose to use it for this post.2
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。新收录的资料对此有专业解读
Что думаешь? Оцени!，更多细节参见新收录的资料
Антон Похиляк (редактор отдела оперативной информации)，详情可参考新收录的资料
Alison Francis,Senior Science Journalist