The first obvious follow up question is “what does ‘reasonably efficient’ Problems which can be verified reasonably efficiently.Problems which can be solved reasonably efficiently.When we talk about whether or not a problem is hard, we often group problems Hard enough, that the Go team did not want to require an That sentence is in the Go spec because it turns out to be hard to determine ifĪ type set is empty.
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It also means, some of the information might be boring to you -įeel free to skip the corresponding sections. My explanation, which means that you should not need any special knowledge to Related design decisions of the generics design. I want to explain why that sentence is there and also go into a couple of
Mistake - an empty type set can never be used as a constraint. It would be very helpful to report that to the user. That is what this clause from the spec is about. The compiler accepts it just fine, though. The predeclared type int and have a method M(). That is, it would be great if we could write something It would be great if there was a way to support multiple of these mechanisms Predeclared types and support user defined types. One thing standing out in this table is that there is no way to both support
Understanding the purposeĪnd idea behind the Comparator type is likely to trip up your users when Lastly, this is arguably too clever for its own good. (like reversing the order) inline with a func literal, this mechanism always Where with the comparison function we could define customizations That’s similar to how weĪlways had to pass a less function explicitly above.Īnother disadvantage is that this always requires defining a type forĬomparisons. It always has toīe specified in the instantiation explicitly 1. One disadvantage is that the comparator can never be inferred. It also carries over the advantage of decoupling the comparison from theĮlement type, which we got from accepting comparison functions. For example, a SearchTree, int]Ĭan be used directly, without extra initialization. The advantage of this approach is that it makes the zero value of Type ReverseInt int func ( i ReverseInt ) Less ( j ReverseInt ) bool
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