Hello Shawn, thank you for answering.
I'm sorry, I was a bit sloppy with my example and so maybe unclear about my
question ...
It's not about the precise syntax of getting a reference to a subroutine, but
rather a subroutine in a module.
For example, this pgm is clear:
#!/usr/bin/env perl
sub b { print "hello world\n"; }
my $a = \&b;
&$a;
prints
hello world
But this pgm fails:
#!/usr/bin/env perl
use Math::Trig;
my $a = \&Math::Trig::cos;
&$a(0);
Undefined subroutine &Math::Trig::cos called at modfunctor line 7.
(and other tested variations, too numerous to list here)
e.g.:
my $a = \&cos;
Undefined subroutine &main::cos called at modfunctor line 8.
my $a = "cos"; # symbolic ref
Undefined subroutine &main::cos called at modfunctor line 8.
my $a = "Math::Trig::cos";
Undefined subroutine &Math::Trig::cos called at modfunctor line 9.
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