perl 5.000perl-5.000

[editor's note: this commit combines approximate 4 months of furious
releases of Andy Dougherty and Larry Wall - see pod/perlhist.pod for
details.  Andy notes that;
 
Alas neither my "Irwin AccuTrack" nor my DC 600A quarter-inch cartridge 
backup tapes from that era seem to be readable anymore.  I guess 13 years 
exceeds the shelf life for that backup technology :-(.
]

1 files changed, 65 insertions, 0 deletions

diff --git a/pod/modpods/strict.pod b/pod/modpods/strict.pod
new file mode 100644
index 0000000000..e994ed2bc5
--- /dev/null
+++ b/pod/modpods/strict.pod
@@ -0,0 +1,65 @@
+=head1 NAME
+
+strict - Perl pragma to restrict unsafe constructs
+
+=head1 SYNOPSIS
+
+    use strict;
+
+    use strict "vars";
+    use strict "refs";
+    use strict "subs";
+
+    use strict;
+    no strict "vars";
+
+=head1 DESCRIPTION
+
+If no import list is supplied, all possible restrictions are assumed.
+(This the safest mode to operate in, but is sometimes too strict for
+casual programming.) Currently, there are three possible things to be
+strict about:  "subs", "vars", or "refs".
+
+=over 6
+
+=item C<strict refs>
+
+This generates a runtime error if you 
+use symbolic references (see L<perlref>).
+
+    use strict 'refs';
+    $ref = \$foo;
+    print $$ref;	# ok
+    $ref = "foo";
+    print $$ref;	# runtime error; normally ok
+
+=item C<strict vars>
+
+This generates a compile-time error if you access a variable that wasn't
+localized via C<my()> or wasn't fully qualified.  Because this is to avoid
+variable suicide problems and subtle dynamic scoping issues, a merely
+local() variable isn't good enough.  See L<perlfunc/my> and
+L<perlfunc/local>.
+
+    use strict 'vars';
+    $X::foo = 1;	 # ok, fully qualified
+    my $foo = 10;	 # ok, my() var
+    local $foo = 9;	 # blows up
+
+The local() generated a compile-time error because you just touched a global
+name without fully qualifying it.
+
+=item C<strict subs>
+
+This disables the poetry optimization,
+generating a compile-time error if you 
+try to use a bareword identifiers that's not a subroutine.
+
+    use strict 'subs';
+    $SIG{PIPE} = Plumber;   	# blows up
+    $SIG{"PIPE"} = "Plumber"; 	# just fine
+
+=back
+
+See L<perlmod/Pragmatic Modules>.
+