[fpc-devel] Dangerous optimization in CASE..OF

[Michael Van Canneyt]

On Fri, 13 Apr 2018, Ondrej Pokorny wrote:

> On 02.07.2017 18:55, Ondrej Pokorny wrote:
>> On 02.07.2017 18:49, Jonas Maebe wrote:
>>> No, there is no built-in checked conversion from integer to arbitrary 
>>> enumeration types. That's why I suggested in the bug report that started 
>>> this thread to file a feature request for such a conversion.
>> 
>> Very good :)
>> 
>>>> Are there any disadvantages of the enum-AS operator that prevents its 
>>>> introduction?
>>> 
>>> Someone else could already have code that overloads the AS-operator in 
>>> this way, and such a change would break this (you cannot overload 
>>> operators with a built-in meaning). I would be in favour of a new 
>>> intrinsic.
>> 
>> If I am not mistaken, the AS operator cannot be overloaded - so no chance 
>> to break legacy code here.
>
> Because
>
> 1.) you agreed that a built-in checked conversion from integer to arbitrary 
> enumeration type is wanted and
> 2.) the AS-operator cannot be overloaded and thus the only argument against 
> enum support for AS is not valid
>
> I introduced the AS operator for enumerators in 
> https://bugs.freepascal.org/view.php?id=33603

Nice idea, Ondrej :)

Michael.