Difference between revisions of "Talk:Void-safe migration guide"

 
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''--[[User:Ericb|Ericb]] 14:34, 2 August 2009 (UTC)''': The problem about not having `default_create' as creation procedure in CELL anymore, even when the actual generic parameter is detachable, is not just an expandedness issue. What do we do with code like that:
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'''--[[User:Ericb|Ericb]] 14:34, 2 August 2009 (UTC)''': The problem about not having `default_create' as creation procedure in CELL anymore, even when the actual generic parameter is detachable, is not just an expandedness issue. What do we do with code like that:
 
<eiffel>
 
<eiffel>
 
class A [G -> ANY create default_create end]
 
class A [G -> ANY create default_create end]
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:'''--[[User:Manus|manus]] 18:27, 3 August 2009 (UTC)''': Of course here you have not much choice and you either have to rewrite `A' and/or define a new CELL class that has ''default_create'' as a creation procedure. The real question is how much of this code actually exists and the impact of rewriting the code that depended on that. Another solution is to modify `default_create' in ANY to have a precondition re-definable by descendants so to leave your code unchanged, in this case `CELL' would say it is ok to use ''default_create'' but only when the actual generic parameter is detachable.
 
:'''--[[User:Manus|manus]] 18:27, 3 August 2009 (UTC)''': Of course here you have not much choice and you either have to rewrite `A' and/or define a new CELL class that has ''default_create'' as a creation procedure. The real question is how much of this code actually exists and the impact of rewriting the code that depended on that. Another solution is to modify `default_create' in ANY to have a precondition re-definable by descendants so to leave your code unchanged, in this case `CELL' would say it is ok to use ''default_create'' but only when the actual generic parameter is detachable.
  
::--[[User:Ericb|Ericb]] 07:37, 4 August 2009 (UTC): You have to keep in mind that ECMA says that the precondition of creation procedures should not have unqualified calls. Also, for the issue with CELL, I think that I was the one who used this example (which occurs in existing code) to try to bring the attention that void-safety goes against reusability. From there, void-safety proponents tried to show that there was actually no problem, but most of them didn't address the reusability issue. That's why I put this note here, to remind people what the real problem is with the CELL example.
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::'''--[[User:Ericb|Ericb]] 07:37, 4 August 2009 (UTC)''': You have to keep in mind that ECMA says that the precondition of creation procedures should not have unqualified calls. Also, for the issue with CELL, I think that I was the one who used this example (which occurs in existing code) to try to bring the attention that void-safety goes against reusability. From there, void-safety proponents tried to show that there was actually no problem, but most of them didn't address the reusability issue. That's why I put this note here, to remind people what the real problem is with the CELL example.

Latest revision as of 23:38, 3 August 2009

--Ericb 14:34, 2 August 2009 (UTC): The problem about not having `default_create' as creation procedure in CELL anymore, even when the actual generic parameter is detachable, is not just an expandedness issue. What do we do with code like that:

class A [G -> ANY create default_create end]
...
end
 
a: A [CELL [detachable FOO]]
--manus 18:27, 3 August 2009 (UTC): Of course here you have not much choice and you either have to rewrite `A' and/or define a new CELL class that has default_create as a creation procedure. The real question is how much of this code actually exists and the impact of rewriting the code that depended on that. Another solution is to modify `default_create' in ANY to have a precondition re-definable by descendants so to leave your code unchanged, in this case `CELL' would say it is ok to use default_create but only when the actual generic parameter is detachable.
--Ericb 07:37, 4 August 2009 (UTC): You have to keep in mind that ECMA says that the precondition of creation procedures should not have unqualified calls. Also, for the issue with CELL, I think that I was the one who used this example (which occurs in existing code) to try to bring the attention that void-safety goes against reusability. From there, void-safety proponents tried to show that there was actually no problem, but most of them didn't address the reusability issue. That's why I put this note here, to remind people what the real problem is with the CELL example.