Author: larry
Date: Mon Nov 6 14:44:17 2006
New Revision: 13463
Modified:
doc/trunk/design/syn/S12.pod
Log:
Changed has= to autoclose for consistency with other temporal declarators.
Modified: doc/trunk/design/syn/S12.pod
==============================================================================
--- doc/trunk/design/syn/S12.pod (original)
+++ doc/trunk/design/syn/S12.pod Mon Nov 6 14:44:17 2006
@@ -12,9 +12,9 @@
Maintainer: Larry Wall <[EMAIL PROTECTED]>
Date: 27 Oct 2004
- Last Modified: 1 Nov 2006
+ Last Modified: 6 Nov 2006
Number: 12
- Version: 30
+ Version: 31
=head1 Overview
@@ -466,13 +466,25 @@
@.foo.(1,2,3); # ditto
Pseudo-assignment to an attribute declaration specifies the default
-value. The value on the right is evaluated at class composition
-time, that is, while the class is being compiled and the class
-object constructed. However, if the default value is a closure,
-that closure will be executed later at object initialization time.
-(Use a double closure to initialize to a closure value.) The topic
-of the closure will be the attribute being initialized, while "self"
-refers to the entire object being initialized.
+value. The value on the right is treated as an implicit closure and
+evaluated at object build time, that is, when the object is being
+constructed, not when class is being composed. To refer to a value
+computed at compilation or composition time, you can either use a
+temporary or a temporal block of some sort:
+
+ has $.r = rand; # each object gets different random value
+
+ constant $random = rand;
+ has $.r = $random; # every object gets same value
+
+ has $.r = BEGIN { rand };
+ has $.r = INIT { rand };
+ has $.r = ENTER { rand };
+ has $.r = FIRST { rand };
+
+When it is called at BUILD time, the topic of the implicit closure
+will be the attribute being initialized, while "self" refers to the
+entire object being initialized.
Class attributes are declared with either C<my> or C<our>. The only
difference from ordinary C<my> or C<our> variables is that an accessor
