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This is purely conjectural but, because at the point of compilation in sub1 the prototype of sub2 has yet to be defined, the args will be passed in as is. However, at the point when sub3 is compiled the prototype has been seen, so the args are munged to fit the prototype so @_ is forced into a scalar context. So if we predeclare sub2 we see consistent behaviour of calling sub2 with @_ e.g
sub sub2(*); sub sub1(*) { print "args(1): @_\n"; sub2(@_); } sub sub2(*) { print "args(2): @_\n"; } sub sub3(*) { print "args(3): @_\n"; sub2(@_); } sub1 Bareword; sub3 Bareword; __output__ args(1): Bareword args(2): 1 args(3): Bareword args(2): 1
Although I'm not positive on that explanation, I believe it's something along those lines.

Update: indeed, if we change the prototype between the compilation of the subs we see the output changes to the expected behaviour of the above explanation e.g

sub sub2(*); sub sub1(*) { print "args(1): @_\n"; sub2(@_); } sub sub2 { print "args(2): @_\n"; } sub sub3(*) { print "args(3): @_\n"; sub2(@_); } sub1 Bareword; sub3 Bareword; __output__ args(1): Bareword args(2): 1 args(3): Bareword args(2): Bareword
HTH

_________
broquaint


In reply to Re: Stumped when passing barewords by broquaint
in thread Stumped when passing barewords by crenz

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