Pick a class at random

[axricard]

On Wednesday, 3 January 2024 at 17:44:00 UTC, H. S. Teoh wrote:
> On Wed, Jan 03, 2024 at 04:50:57PM +0000, axricard via 
> Digitalmars-d-learn wrote:
>> I have an interface that is implemented by many classes, and I 
>> want to pick one of these implementations at random. There are 
>> two more constraints : first the distribution is not uniform, 
>> all classes can define the chance they have to be picked (this 
>> is reflected by the function 'weight()' below).  And all 
>> classes are not always available, this depends on some runtime 
>> information.
>
> I would tag each implementation with a compile-time enum and 
> use compile-time introspection with CRTP[1] to auto-generate 
> the code for choosing a class according to the desired 
> distribution.
>
> [1] 
> https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern


That works very well, thank you !!