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Postings from March 2003
Currently the only information about what happens with contructs like
this:
my $x = $_ for (@array);
is documented in perlsub in a note, which is hardly the right place for
it. The section in perlsyn which defines the statement modifiers has
nothing on it.
This patch moves the note from perlsub to perlsyn, and puts a reference
to the perlsyn section in perlsub.
Regards,
Martien
diff -r -c ../devperl/pod/perlsub.pod ./pod/perlsub.pod
*** ../devperl/pod/perlsub.pod 2003-02-15 18:27:01.000000000 +1100
--- ./pod/perlsub.pod 2003-03-15 12:21:39.000000000 +1100
***************
*** 325,338 ****
the scope of $answer extends from its declaration through the rest
of that conditional, including any C<elsif> and C<else> clauses,
! but not beyond it.
!
! B<NOTE:> The behaviour of a C<my> statement modified with a statement
! modifier conditional or loop construct (e.g. C<my $x if ...>) is
! B<undefined>. The value of the C<my> variable may be C<undef>, any
! previously assigned value, or possibly anything else. Don't rely on
! it. Future versions of perl might do something different from the
! version of perl you try it out on. Here be dragons.
The C<foreach> loop defaults to scoping its index variable dynamically
in the manner of C<local>. However, if the index variable is
--- 325,332 ----
the scope of $answer extends from its declaration through the rest
of that conditional, including any C<elsif> and C<else> clauses,
! but not beyond it. See L<perlsyn/"Simple statements"> for information
! on the scope of variables in statements with modifiers.
The C<foreach> loop defaults to scoping its index variable dynamically
in the manner of C<local>. However, if the index variable is
diff -r -c ../devperl/pod/perlsyn.pod ./pod/perlsyn.pod
*** ../devperl/pod/perlsyn.pod 2003-01-21 14:06:22.000000000 +1100
--- ./pod/perlsyn.pod 2003-03-15 12:21:42.000000000 +1100
***************
*** 134,139 ****
--- 134,147 ----
} while $x++ <= $z;
}
+ B<NOTE:> The behaviour of a C<my> statement modified with a statement
+ modifier conditional or loop construct (e.g. C<my $x if ...>) is
+ B<undefined>. The value of the C<my> variable may be C<undef>, any
+ previously assigned value, or possibly anything else. Don't rely on
+ it. Future versions of perl might do something different from the
+ version of perl you try it out on. Here be dragons.
+
+
=head2 Compound statements
In Perl, a sequence of statements that defines a scope is called a block.
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