That's not equivalent. If you wanted to use the ternary operator,
defined($foo = $bar->id) or $self->error('blah blah');
would be equivalent to
defined($foo = $bar->id) ? undef : $self->error('blah blah');

$foo = defined($bar->id) || $self->error('blah blah');
would be equivalent to
$foo = defined($bar->id) ? $bar->id : $self->error('blah blah');
but that's not relevant here.

In reply to Re^2: creating operands by ikegami
in thread creating operands by pvilleSE

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