Re: Dereference a reference to a file handle created with IO::File

Refer print:

FILEHANDLE may be a scalar variable containing the name of or a reference to the filehandle,...

UPDATE: Changed emphasis per Tobyink (below)

Bill

Comment on Re: Dereference a reference to a file handle created with IO::File

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Re^2: Dereference a reference to a file handle created with IO::File by tobyink (Canon) on Oct 28, 2020 at 08:41 UTC
Yeah, this is a place you need to pay careful attention to the wording. It has to be a scalar variable, not just a scalar. Like `foo()` could return a scalar, and that scalar could be a reference to a filehandle. But `print foo() "string\n"` will fail because even though `foo()` evaluates to a scalar, it's not a scalar variable. Nor is `$foo{'somekey'}`. Same as you're not allowed to do: `my %foo; for $foo{'somekey'} ( @arr ) { ...; }` [download] toby döt ink	[reply] [d/l] [select]

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Re^2: Dereference a reference to a file handle created with IO::File
by tobyink (Canon) on Oct 28, 2020 at 08:41 UTC

Yeah, this is a place you need to pay careful attention to the wording. It has to be a scalar variable, not just a scalar.

Like foo() could return a scalar, and that scalar could be a reference to a filehandle. But print foo() "string\n" will fail because even though foo() evaluates to a scalar, it's not a scalar variable. Nor is $foo{'somekey'}.

Same as you're not allowed to do:

my %foo;
for $foo{'somekey'} ( @arr ) {
  ...;
}
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toby döt ink

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