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Drools can not use a generic type for a function's parameter in DRL


Drools can not use a generic type for a function's parameter in DRL

By : user2172902
Date : October 22 2020, 08:10 AM
around this issue Seems like you need to not mention what your ArrayList uses in the parameters. The following example works fine for me (it's an ArrayList of a custom Object) :
code :
function testFunction(ArrayList al)
{
    System.err.println("Called a function with the ArrayList : " + java.util.Arrays.toString(al.toArray()));
}


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Java generic: how to declare a generic parameter as the base type of another generic parameter?

Java generic: how to declare a generic parameter as the base type of another generic parameter?


By : netflixonlyx420x
Date : March 29 2020, 07:55 AM
I hope this helps . ,
how can I make sure that java infers
code :
twoCars.replaceFirst(new Tank())
twoCars.<Vehicle>replaceFirst(new Tank())
Tank actuallyACar = twoCars.<Vehicle>replaceFirst(new Tank()).second();
Get Type of Parameter from Generic Delegate functions

Get Type of Parameter from Generic Delegate functions


By : user2003695
Date : March 29 2020, 07:55 AM
wish helps you If you want to retrieve the type "T" from an instance of you delegate, use this call:
code :
obj.GetType().GetGenericArguments().First();
Typescript generic functions not working as expected - parameter containing another generic type than required, compiles

Typescript generic functions not working as expected - parameter containing another generic type than required, compiles


By : Fabian Grutsch
Date : March 29 2020, 07:55 AM
To fix this issue I am trying to develop simple event bus class in Typescript, where it will be possible to publish events and subscribe to them. It will be nice to have binding between published topic and the interface of data published. I have tried to achieve this using function and class generics, however some of my test cases are not working as expected (in a way that the lines I would expect to fail are compiled OK). I have also added example from: https://www.typescriptlang.org/docs/handbook/generics.html , which works as expected. In real-world situation I am planning to have instances of topics stored somewhere as singletons. , Here:
code :
class Topic<A> {}
class Topic<A> { abc: A; }
Is it necessary to pass a type parameter to static functions in a generic class?

Is it necessary to pass a type parameter to static functions in a generic class?


By : A. Azizli
Date : March 29 2020, 07:55 AM
I hope this helps . GenericClass is not a concrete type in Swift. There's no way to talk about it any more than you can talk about the type Array without providing its type parameter. (The specific feature Swift lacks that would allow this is called "higher-kinded types.")
Static methods are tied to the concrete type (GenericClass) not to the higher-kinded type (GenericClass). In order to access the static methods, it needs to know the actual type you want.
Can't use a type parameter inside a generic Functions in Typescript

Can't use a type parameter inside a generic Functions in Typescript


By : Julius
Date : March 29 2020, 07:55 AM
help you fix your problem It's because your signature is syntax is wrong, so you're ending up with a nested arrow function and Key is out of scope. There's really no need to define functions with const = () => unless you're worried about binding, so you can just make it more readable with the function keyword:
code :
function getDefaultFilterObjFromKeys<Key extends keyof FilterFields>(keys: Key[]): IFiltersState<Key> {
  if (keys.length === 0){
    throw Error("empty Arr")
  }
  const defaults = {}
  Object.entries(_.pick(filterFields, keys)).forEach(
    ([k, filterField]) => {
      defaults[k] = filterField.defaultVal
    },
  )
  return defaults as IFiltersState<Key>
}
const getDefaultFilterObjFromKeys2 = <Key extends keyof FilterFields>(keys: Key[]): IFiltersState<Key> => {
  if (keys.length === 0){
    throw Error("empty Arr")
  }
  const defaults = {}
  Object.entries(_.pick(filterFields, keys)).forEach(
    ([k, filterField]) => {
      defaults[k] = filterField.defaultVal
    },
  )
  return defaults as IFiltersState<K>
}
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