Re^2: Test if a string is a sub name


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Re^2: Test if a string is a sub name

by BillKSmith (Monsignor)

on Oct 06, 2022 at 15:15 UTC ( #11147273=note: print w/replies, xml )

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in reply to Re: Test if a string is a sub name
in thread Test if a string is a sub name

I do not understand how your expression &$string works. The documentation for exists tells us that the expression must return the name of a subroutine. It appears to me that this would only be true for your expression if $string is a symbolic reference (which is prohibited by use strict). I would expect you need string interpolation (perhaps "&$string") but this syntax throws an error that the argument of exists is not a subroutine.

Bill

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Re^3: Test if a string is a sub name
by choroba (Cardinal) on Oct 06, 2022 at 15:22 UTC

Use of a subroutine call, rather than a subroutine name, as an argument to exists is an error.
exists &sub;    # OK
exists &sub();  # Error
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So, in this context, "subroutine name" includes the ampersand.

Considering strict, note the exceptions to strict 'refs':