元组将按照什么顺序排序? [英] What order will tuples sort in?

问题描述

元组将以什么顺序排序?我知道F#中的元组实现了IStructuralComparable，但是我找不到关于它的任何文档.

What order will tuples sort in? I understand that tuples in F# implements IStructuralComparable but I can't find any documentation on what that is.

例如，如果我向Seq.SortBy输入一个返回元组的函数，那么我的序列将按什么顺序?

For example, If I input a function to Seq.SortBy that returns a tuple, what order would my sequence be in?

推荐答案

让我们做实验.在互动提示中输入

Let's do the experiment.  Type this into the interactive prompt

let l = [ (4,2) ; (1,2) ; (2,3) ; (2,1) ]
l |> Seq.sortBy id;;

并获得

val it : seq<int * int> = seq [(1, 2); (2, 1); (2, 3); (4, 2)]

这是明显的排序类型-按第一个元素排序，然后在第二个元素内排序，依此类推.

which is the obvious type of ordering -- sort by first element, then within that sort by second, etc.

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