From: "marcandre (Marc-Andre Lafortune)" <ruby-core@...>
Date: 2012-12-09T10:44:44+09:00
Subject: [ruby-core:50702] [ruby-trunk - Bug #7248] Shouldn't Enumerator::Lazy.new be private?


Issue #7248 has been updated by marcandre (Marc-Andre Lafortune).


Oh, interesting.

I'll do my best to document it, then.

This leads to more questions, though:

1) Is there a use case for the form without a block?

It's used internally (before calling lazy_set_method), but other than that I can't see a good use.

2) Is there a use case for specifying a symbol and arguments?

Again, internally we call lazy_set_method, to the symbol and arguments are only used by inspect, right?

3) Is there a good way to improve the `inspect` of such a lazy enum?

    p [11,12,13].filter_map{|i| i*i if i.even?} # => #<Enumerator::Lazy: #<Enumerator::Lazy: [1, 2, 3]>:each>

Notice the `each` and no appearance of `filter_map`

Doing `Lazy.new(self, :filter_map)` does not work and seems redundant.

Thanks

BTW, ultimately, I'm trying to see if Lazy.new can be adapted to accept a `size` lambda argument...

----------------------------------------
Bug #7248: Shouldn't Enumerator::Lazy.new be private?
https://bugs.ruby-lang.org/issues/7248#change-34548

Author: marcandre (Marc-Andre Lafortune)
Status: Assigned
Priority: Normal
Assignee: yhara (Yutaka HARA)
Category: core
Target version: 2.0.0
ruby -v: ruby 2.0.0dev (2012-10-29 trunk 37380) [x86_64-darwin10.8.0]


Is there a reason why Enumerator::Lazy.new is not private?

Lazy enumerators should be created with `Enumerable#lazy`. Moreover, there is no doc, and it can give unexpected results too.


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