Re^2: The & prototype and code references in scalars.

The first example isn't an option because the sub in question is in a module (threads::async()). Also it defeats the most common use case of an in-line bareblock.

The latter doesn't help as I only have (multiple) coderefs at the place of use. I could use async{ $coderef->( ... ) };, but I'm not keen on the doubling of the call overhead.

I just rediscovered async \&{ $codeRef };. I'm not sure if that's equally costly.

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Re^3: The & prototype and code references in scalars. by LanX (Saint) on Feb 17, 2010 at 21:51 UTC
We had this discussion recentlyš, unfortunately you can't define a prototype which allows literal codeblocks and coderefs (resp. scalars) at the same time. You can allow alternatives with `(\[&$])` but alas there is no `([&$])` 8( At least you can spare the curlies `async \&$codeRef ;` ! Cheers Rolf š) update see coderefs and (&) prototypes	[reply] [d/l] [select]
Re^4: The & prototype and code references in scalars. by BrowserUk (Patriarch) on Feb 18, 2010 at 00:17 UTC
Thanks for the reference. I think I must have been away that day cos I do not remember that thread at all. And looking at my posting history, I didn't post anything that entire week. With regard to `\&{ $coderef }` versus `\&$coderef`: I discovered long ago that there is no performance difference between `sigil{ $scalar }` & `sigil$scalar`; and that (for example) `print for @{ $_[0] }` works, where `print for @$_[0]` doesn't. Hence, the 2-char longer (4 if you count my preferred whitespacing) form has no downsides and benefits from the extra clarity when the scalar being dereferenced comes from a compound source. Plus I do not have to try and remember when I have to use the longer form and when I can get away with the shorter. And I like consistency. Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice. "I'd rather go naked than blow up my ass"	[reply] [d/l] [select]
Re^5: The & prototype and code references in scalars. by LanX (Saint) on Feb 18, 2010 at 00:25 UTC
Well `@$_[0]` parses as `@{$_}[0]` producing an arrayslice. My rule is simple, better use curlies when it gets long. Cheers Rolf	[reply] [d/l] [select]