The Trunk: Exceptions-ar.21.mcz

Andreas Raab uploaded a new version of Exceptions to project The Trunk:
http://source.squeak.org/trunk/Exceptions-ar.21.mcz

==================== Summary ====================

Name: Exceptions-ar.21
Author: ar
Time: 13 February 2010, 3:25:29.981 pm
UUID: 19e39449-633b-944a-b43b-71bdb7ea232b
Ancestors: Exceptions-ar.20

Introduce Exception>>defaultReturnValue and Exception>>defaultResumeValue to provide default values for argument-less #resume or #return. The motivation is that catch-all handler may not be aware of specific return / resume values required by some exceptions. The protocol allows these exceptions to provide a reasonable default value for those situations.

=============== Diff against Exceptions-ar.20 ===============

Item was added:
+ ----- Method: Exception>>defaultResumeValue (in category 'defaults') -----
+ defaultResumeValue
+ "Answer the value that by default should be returned if the exception is resumed"
+ ^nil!

Item was changed:
  ----- Method: Exception>>resume (in category 'handling') -----
  resume
  "Return from the message that signaled the receiver."
 
+ self resume: self defaultResumeValue!
- self resume: nil!

Item was added:
+ ----- Method: Exception>>defaultReturnValue (in category 'defaults') -----
+ defaultReturnValue
+ "Answer the value that by default should be returned if the exception is returned"
+ ^nil!

Item was changed:
  ----- Method: Exception>>return (in category 'handling') -----
  return
  "Return nil as the value of the block protected by the active exception handler."
 
+ self return: self defaultReturnValue!
- self return: nil!