X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperlsub.pod;h=2969341ca12d183935d162b79f30ab5d482d8893;hb=b30f304ae36b3931349d7d5816f5a5646afe5397;hp=7bee99959d5b0b241a230a85923f56d0a615fad7;hpb=e6a32221b6c71ad78d080d3068590aa4358be665;p=p5sagit%2Fp5-mst-13.2.git diff --git a/pod/perlsub.pod b/pod/perlsub.pod index 7bee999..2969341 100644 --- a/pod/perlsub.pod +++ b/pod/perlsub.pod @@ -220,9 +220,9 @@ Synopsis: my @oof = @bar; # declare @oof lexical, and init it my $x : Foo = $y; # similar, with an attribute applied -B: The use of attribute lists on C declarations is -experimental. This feature should not be relied upon. It may -change or disappear in future releases of Perl. See L. +B: The use of attribute lists on C declarations is still +evolving. The current semantics and interface are subject to change. +See L and L. The C operator declares the listed variables to be lexically confined to the enclosing block, conditional (C), @@ -325,14 +325,8 @@ it. Similarly, in the conditional the scope of $answer extends from its declaration through the rest of that conditional, including any C and C clauses, -but not beyond it. - -B The behaviour of a C statement modified with a statement -modifier conditional or loop construct (e.g. C) is -B. The value of the C variable may be C, 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. +but not beyond it. See L for information +on the scope of variables in statements with modifiers. The C loop defaults to scoping its index variable dynamically in the manner of C. However, if the index variable is @@ -563,6 +557,13 @@ hash to some other implementation: } [..%ahash back to its initial tied self again..] +B The code example above does not currently work as described. +This will be fixed in a future release of Perl; in the meantime, avoid +code that relies on any particular behaviour of localising tied arrays +or hashes (localising individual elements is still okay). +See L for more +details. + As another example, a custom implementation of C<%ENV> might look like this: @@ -679,7 +680,7 @@ subroutine never gets that chance. Consider; # set_arr_lv cannot stop this ! set_arr_lv() = { a => 1 }; - + =back =head2 Passing Symbol Table Entries (typeglobs) @@ -1150,8 +1151,8 @@ only occasionally and for good reason. Typically this might be done by a package attempting to emulate missing built-in functionality on a non-Unix system. -Overriding may be done only by importing the name from a -module--ordinary predeclaration isn't good enough. However, the +Overriding may be done only by importing the name from a module at +compile time--ordinary predeclaration isn't good enough. However, the C pragma lets you, in effect, predeclare subs via the import syntax, and these names may then override built-in ones: @@ -1353,7 +1354,7 @@ parsed and invoked: use attributes __PACKAGE__, \&plugh, q[Ugly('\(")], 'Bad'; For further details on attribute lists and their manipulation, -see L. +see L and L. =head1 SEE ALSO