In Ruby 2.4 and for Integer Ranges, Range(Enumerable)#sum is optimized to return a result directly, without iterating over all elements.

在Ruby 2.4和Integer Ranges中,Range(Enumerable)#sum被优化为直接返回结果,而不迭代所有元素。

I don't understand why the corresponding code is defined in enum.c for the Enumerable module and not in range.c for Range class.

我不明白为什么在enum.c中为Enumerable模块定义了相应的代码,而在Range.c中没有在range.c中定义。

Why should Enumerable know about classes that include it (e.g. Range, Hash, ...) and check for their type instead of letting those classes overwrite Enumerable#sum?

为什么Enumerable应该知道包含它的类(例如Range,Hash,...)并检查它们的类型而不是让这些类覆盖Enumerable#sum?

Seen in enum.c :

见于enum.c:

 return int_range_sum(beg, end, excl, memo.v);
 # or
 hash_sum(obj, &memo);

1 个解决方案