Re^2: make subroutine that takes expression as implicit block as first arg

in reply to Re: make subroutine that takes expression as implicit block as first arg
in thread make subroutine that takes expression as implicit block as first arg

That won't work, for the proposed case:

Type of arg 1 to main::mygrep must be block or sub {} (not numeric eq 
+(==)) at /tmp/mygrep line 7, near "10)"
Execution of /tmp/mygrep aborted due to compilation errors.
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Perhaps something like this?

sub mygrep { my $s = "grep $_[0]"; eval $s; }

print for mygrep('$_ % 2 == 0, 0..10');    # :-)
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"Language shapes the way we think, and determines what we can think about."
-- B. L. Whorf

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Re^3: make subroutine that takes expression as implicit block as first arg by kennethk (Abbot) on Aug 13, 2010 at 20:01 UTC
I added a use case, as this sort of structure is a bit sensitive - perl apparently interprets the OP proposed use case as an anonymous hash because parentheses are present. When I was going through a clever phase, I played a bit with prototypes, and decided they are generally more trouble than they are worth. IMHO, of course.	[reply]

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