X-Git-Url: http://git.vpit.fr/?a=blobdiff_plain;f=lib%2FVariable%2FMagic.pm;h=45ba9b533fda18fc139a78ceb47001802882f393;hb=2078b6422b776ca13c21374d85aa15f3f274cc65;hp=7b4034c5b2a00892e4ffc0b1515c6cb12e9f4656;hpb=079f8c8d79cff6d7cc2e467a0994a2a017f9f40f;p=perl%2Fmodules%2FVariable-Magic.git

diff --git a/lib/Variable/Magic.pm b/lib/Variable/Magic.pm
index 7b4034c..45ba9b5 100644
--- a/lib/Variable/Magic.pm
+++ b/lib/Variable/Magic.pm
@@ -24,14 +24,29 @@ BEGIN {
 
 =head1 SYNOPSIS
 
-    use Variable::Magic qw/wizard cast dispell/;
-
-    my $wiz = wizard set => sub { print STDERR "now set to ${$_[0]}!\n" };
-    my $a = 1;
-    cast $a, $wiz;
-    $a = 2;          # "now set to 2!"
-    dispell $a, $wiz;
-    $a = 3           # (nothing)
+    use Variable::Magic qw/wizard cast VMG_OP_INFO_NAME/;
+
+    { # A variable tracer
+     my $wiz = wizard set  => sub { print "now set to ${$_[0]}!\n" },
+                      free => sub { print "destroyed!\n" };
+
+     my $a = 1;
+     cast $a, $wiz;
+     $a = 2;        # "now set to 2!"
+    }               # "destroyed!"
+
+    { # A hash with a default value
+     my $wiz = wizard data     => sub { $_[1] },
+                      fetch    => sub { $_[2] = $_[1] unless exists $_[0]->{$_[2]}; () },
+                      store    => sub { print "key $_[2] stored in $_[-1]\n" },
+                      copy_key => 1,
+                      op_info  => VMG_OP_INFO_NAME;
+
+     my %h = (_default => 0, apple => 2);
+     cast %h, $wiz, '_default';
+     print $h{banana}, "\n"; # "0", because the 'banana' key doesn't exist in %h
+     $h{pear} = 1;           # "key pear stored in helem"
+    }
 
 =head1 DESCRIPTION
 
@@ -278,6 +293,8 @@ However, only the return value of the C<len> callback currently holds a meaning.
                      set  => sub { print STDERR "set to ${$_[0]}\n" },
                      free => sub { print STDERR "${$_[0]} was deleted\n" }
 
+Note that C<free> callbacks are I<never> called during global destruction, as there's no way to ensure that the wizard and the C<free> coderef weren't destroyed before the scalar.
+
 =cut
 
 sub wizard {