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Feature #9487

closed

Add #dup?, #dup! and #clone? and #clone!

Added by atlas (Atlas Prime) almost 11 years ago. Updated almost 11 years ago.

Status:
Rejected
Assignee:
matz (Yukihiro Matsumoto)
Target version:
2.6
[ruby-core:60511]

Description

Some objects can't use #dup or #clone b/c they are singleton, like Integer. So an error is raised if one tries.

> 5.dup
TypeError: can't dup Fixnum

It would helpful if there was an easy way to check if this is so on an arbitrary object without having to go through the overhead of rescuing the TypeError. e.g.

if o.dup?
  x = o.dup
  ...

Even more convenient in some cases would not having to worry about it at all. If the object can't be duplicated or cloned then just return the object itself.

> 5.dup!
5

The same for #clone with #clone? and #clone!.

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