the problem is that your DataModel is a protocol here, the FilterManager class should be generic and accept any kind of array ... I want to be able to reuse the filter manager class

Hi, thanks, sorry for delay, I really appreciated the help, but the goal is to have a generic FilterManager class, I don't want to use casting inside the init ... I found a way to do it (without using ANY, but I am sure with Swift 5.7 there is a better way to do it) ... I will share it you, give me 1-2 days and I will drop the code here.

thanks, but it does not help, I am still where I was ... something is missing to be able to unbox the filter and pass it the generic array ... I will create a playground and post the GitHub URL

thanks but it does not work, the code compiles ok but if you try to instantiate the FiltersManager class you will have an error you can't pass an array of type Any SimpleFilter to filters typed as [U] in the class initializer Compiler error: Type 'any SimpleFilter' cannot conform to 'SimpleFilter' try this you will see let filters: [any SimpleFilter] = [CountryFilter(), RegionFilter()] var cities = [City]() let manager = TestFiltersManager(array: cities, filters: filters)