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Re: Embedding code in qq{}?

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In article <87ty1lu2z7.fsf@stemsystems.com>,
Uri Guttman  <uri@stemsystems.com> wrote:
>>>>>> "TM" == Tim McDaniel <tmcd@panix.com> writes:
>
>  TM> In article <87limyk471.fsf@Gmail.com>, XeCycle  <XeCycle@Gmail.com>
>  TM> wrote:
>  >> Is it possible to use something like "${1+2}" -> "3"?
>
>  TM> You made it clear in the rest of the article (which I trimmed)
>  TM> that you were thinking about the right-hand side of a s///.  It
>  TM> turns out that, in string contexts in general, you can do it.
>
>  TM> Short answer:
>  TM>     ${\(1+2)}
>
>bad answer.  first off it isn't needed as the /e modifier to s/// does
>it.

Which I tried to make clear but didn't.  I wasn't trying to address
the s/// case; everyone who pointed out s///e covered it quite nicely.
I was trying to cover the case of being outside the RHS of s///.

>secondly it is a bad idea in general. the syntax for that is clunky
>and hard to read. yes, it is legal and works. i just never do it nor
>teach it to anyone. it is just poor coding IMNSHO.

I see one use for it: @{[...]} interpolates a sub call into a quoted
string, which you could not otherwise interpolate in a string.  Since
"use constant" makes the constant be a sub, that's also how you
interpolate a "use constant" constant.  (My work systems have Perl
5.8, and I have no control over the Perl version or the Perl stock of
libraries, so I have to pretty much stick to stock Perl 5.8.)

It does help clarify for me what ${...} means, that ... is simply a
block that returns a value.

-- 
Tim McDaniel, tmcd@panix.com

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Thread

Embedding code in qq{}? XeCycle <XeCycle@Gmail.com> - 2012-03-18 10:56 +0800
  Re: Embedding code in qq{}? Uri Guttman <uri@stemsystems.com> - 2012-03-17 23:04 -0400
    Re: Embedding code in qq{}? XeCycle <XeCycle@Gmail.com> - 2012-03-18 12:14 +0800
  Re: Embedding code in qq{}? tmcd@panix.com (Tim McDaniel) - 2012-03-18 07:07 +0000
    Re: Embedding code in qq{}? Ben Morrow <ben@morrow.me.uk> - 2012-03-18 08:37 +0000
      Re: Embedding code in qq{}? tmcd@panix.com (Tim McDaniel) - 2012-03-18 22:28 +0000
        Re: Embedding code in qq{}? merlyn@stonehenge.com (Randal L. Schwartz) - 2012-03-18 16:18 -0700
          Re: Embedding code in qq{}? tmcd@panix.com (Tim McDaniel) - 2012-03-19 02:21 +0000
            Re: Embedding code in qq{}? Uri Guttman <uri@stemsystems.com> - 2012-03-19 00:14 -0400
              Re: Embedding code in qq{}? tmcd@panix.com (Tim McDaniel) - 2012-03-19 06:42 +0000
                Re: Embedding code in qq{}? Ben Morrow <ben@morrow.me.uk> - 2012-03-19 16:40 +0000
        Re: Embedding code in qq{}? Uri Guttman <uri@stemsystems.com> - 2012-03-18 19:29 -0400
    Re: Embedding code in qq{}? Uri Guttman <uri@stemsystems.com> - 2012-03-18 15:24 -0400
      Re: Embedding code in qq{}? tmcd@panix.com (Tim McDaniel) - 2012-03-18 22:33 +0000
        Re: Embedding code in qq{}? Uri Guttman <uri@stemsystems.com> - 2012-03-18 19:24 -0400
          Re: Embedding code in qq{}? Ben Morrow <ben@morrow.me.uk> - 2012-03-19 00:49 +0000
            Re: Embedding code in qq{}? Uri Guttman <uri@stemsystems.com> - 2012-03-18 22:05 -0400
          Re: Embedding code in qq{}? tmcd@panix.com (Tim McDaniel) - 2012-03-19 02:55 +0000
            Re: Embedding code in qq{}? Uri Guttman <uri@stemsystems.com> - 2012-03-19 00:12 -0400
              Re: Embedding code in qq{}? tmcd@panix.com (Tim McDaniel) - 2012-03-19 07:00 +0000
                Re: Embedding code in qq{}? Ben Morrow <ben@morrow.me.uk> - 2012-03-19 16:43 +0000

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