ruby - 包括可枚举的要求

Question

我一直在尝试设计我的只读 Array 数据结构，我非常喜欢为 Enumerable 类提供遍历选项的想法，但我找不到它的要求。在我看过的一些例子中，C 实现寻找 #each 方法，但在我看来这还不够。

Answer 1

来自 Pickaxe p. 474 也来自 the core documentation :

The class [mixing in Enumerable] must provide a method each, which yields successive members of the collection. If Enumerable#max, min, sort, or sort_by is used, the objects in the collection must also implement a meaningful <=> operator, because these methods rely on an ordering between members of a collection.