What are the limitations of generic programming mechanisms?

In generic programming (Generics) on iOS (Swift), the following limitations exist:

• Type constraints: You cannot use types that do not conform to the specified constraints. For example, if a constraint T: Equatable is specified, the type must implement the Equatable protocol.

• Lack of runtime type information: Due to type erasure, in some cases, it is impossible to obtain the specific type of a generic at runtime.

• Cannot instantiate a generic type without an initializer: If there is no requirement for an initializer in the generic, you cannot create objects of type T().

• Constraints on using generics with Objective-C: Some generic constructs are incompatible with the Objective-C runtime.

• Cannot use generics in certain places: For example, as the type of a property in @objc classes or in some annotations.

These limitations help maintain type safety and performance but require careful design of generic functions and types.