method dispatching
Asked on 10/03/2024
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In the session titled "Explore Swift performance" from WWDC 2024, method dispatching is discussed in the context of static and dynamic dispatch. Static dispatch occurs when the compiler knows at compile time exactly which function is being called, allowing for optimizations like inlining and generic specialization. This is more efficient at the processor level. Dynamic dispatch, on the other hand, is used when the exact function cannot be determined at compile time, enabling polymorphism and abstraction. In Swift, whether a call uses static or dynamic dispatch can depend on where the method is declared. If a method is declared in the main body of a protocol, it uses dynamic dispatch, whereas if it's declared in a protocol extension, it uses static dispatch. This distinction is important for both semantic reasons and performance optimization.
For more details, you can refer to the session Explore Swift performance (05:54).
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