Feature #1432: decrement and increment

• Status: Rejected
• Assignee: -
• Target version: -

[OlegPuchinin (Oleg Puchinin)]

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What about (C) ++/-- ?
=end

[matz (Yukihiro Matsumoto)]

• Status changed from Open to Rejected

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You can't define object-oriented semantics for increment/decrement operations. They are assignments in theory.

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[rogerdpack (Roger Pack)]

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at times I do miss the elegance of being able to do ++
though it does hide the fact that it's internally assignment. Primitives aren't quite as objecty as "normal" objects, so might be an appropriate fit. Just thinking out loud.
-=r
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[brent (Brent Roman)]

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Why is

a+=1

less elegant than

++a

However, I admit that using

(x=a; a+=1; x)

to replace

a++

is pretty evil looking. (The postfix variants are a pain to emulate
correctly)

Are there other commonly used languages besides 'C' that support the ++ and
-- operators?
I always thought they were added to 'C' primarily to support efficient
pointer arithmetic --
something quite foreign to Ruby.

• brent

Nobuyoshi Nakada-3 wrote:

Issue #1432 has been updated by Roger Pack.

at times I do miss the elegance of being able to do ++
though it does hide the fact that it's internally assignment. Primitives
aren't quite as objecty as "normal" objects, so might be an appropriate
fit. Just thinking out loud.
-=r

http://redmine.ruby-lang.org/issues/show/1432

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[rogerdpack (Roger Pack)]

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yeah ++ is the one I miss.
-=r
=end

[matz (Yukihiro Matsumoto)]

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Hi,

In message "Re: [ruby-core:23405] Re: [Feature #1432] decrement and increment"
on Sat, 9 May 2009 15:38:53 +0900, "C.E. Thornton" [e-mail] writes:

|The question comes down to this:
|
| Are we going to allow "Synatic Suger" of this
| sort into Ruby? We already do in sense - By allowing
| more than one way to do things in most situations.

The answer is

we have to mind to add sugars easily

just because syntax sugar is modifying the syntax, and you have to be
slow to modify the syntax.

If we decide to add this particular sugar after serious consideration,
the following question arise:

what is the result of "syntax sugar" conversion. simple += 1 is
suffice, or no?

						matz.

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