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Registry pattern

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A registry is a global association from keys to objects, allowing the objects to be reached from anywhere. It involves two methods:

  • one that takes a key and an object and add objects to the registry
  • and one that takes a key and returns the object for the key.
    It’s similar to the MultitonPattern, but doesn’t restrict instances to only those in the registry.

note that e.g. in python you can register a class or class instance object directly. you don’t need a string key, because under the hood there is a key (the pointer)
I see some implementations limit themself to string names, which won’t work with duplicate key names.