Classify aliasing constructs in the "store" category

[perl/modules/autovivification.git] / lib / autovivification.pm

diff --git a/lib/autovivification.pm b/lib/autovivification.pm
index 825eb9976dceefb7d1cff06d9b101fc3b1091e22..5e42f1f1719c7fc4cb01198b9639d50194a026aa 100644 (file)
--- a/lib/autovivification.pm
+++ b/lib/autovivification.pm
@@ -11,13 +11,13 @@ autovivification - Lexically disable autovivification.
 
 =head1 VERSION
 
-Version 0.01
+Version 0.02
 
 =cut
 
 our $VERSION;
 BEGIN {
- $VERSION = '0.01';
+ $VERSION = '0.02';
 }
 
 =head1 SYNOPSIS
@@ -64,8 +64,8 @@ Enables the features given in C<@opts>, which can be :
 
 C<'fetch'>
 
-Turn off autovivification for rvalue dereferencing expressions, such as C<< $value = $hashref->{key}[$idx]{$field} >>.
-C<undef> is returned when the expression would have autovivified.
+Turn off autovivification for rvalue dereferencing expressions, such as C<< $value = $hashref->{key}[$idx]{$field} >>, C<< keys %{$hashref->{key}} >> or C<< values %{$hashref->{key}} >>.
+When the expression would have autovivified, C<undef> is returned for a plain fetch, while C<keys> and C<values> return C<0> in scalar context and the empty list in list context.
 
 =item *
 
@@ -85,7 +85,7 @@ C<undef> is returned when the expression would have autovivified.
 
 C<'store'>
 
-Turn off autovivification for lvalue dereferencing expressions, such as C<< $hashref->{key}[$idx]{$field} = $value >>.
+Turn off autovivification for lvalue dereferencing expressions, such as C<< $hashref->{key}[$idx]{$field} = $value >> or C<< for ($hashref->{key}[$idx]{$field}) { ... } >>.
 An exception is thrown if vivification is needed to store the value, which means that effectively you can only assign to levels that are already defined (in the example, this would require C<< $hashref->{key}[$idx] >> to already be a hash reference).
 
 =item *