BgEngine | blog engine built using ASP MVC 3 , jQuery and Entity | Database library
kandi X-RAY | BgEngine Summary
kandi X-RAY | BgEngine Summary
BgEngine is an open source application licensed under GPLv3 that builds an engine for personal blogging purposes.
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QUESTION
I have a trait GameStatistics
that defines an add()
method that takes a parameter and returns the sum of itself and the parameter. Implementations in subclasses should only accept instances of their own type as a parameter (or maybe also subtypes).
I would like to use this add
method to aggregate lists of GameStatistics
, using Seq's reduce
method.
I have not been able to define this in Scala and make it compile. Below is one example that I tried plus its compile errors.
The errors don't make any sense to me. How should I get this to work?
...ANSWER
Answered 2020-Jan-18 at 13:07You probably want
<:
(subtype) instead of:
(context bound).this.type
doesn't mean what you think it means (it is the type which only hasthis
(andnull
) as value, not "the current type").If you fixed those problems, the cast in
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