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A selector could be the mechanism utilised to select a technique to execute for an item, or maybe the exclusive identifier that replaces the name in the event the resource code is compiled. A selector functions like a dynamic perform pointer that points to the implementation of a class’ method.
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Q: How will you Examine dynamically at runtime to find out if a class supports a technique which can respond to a selected message?
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The opportunity to Verify dynamically at runtime if a class supports a method might be particularly helpful with delegates (see the subsequent dilemma On this manual) which will have optional techniques a developer can opt to apply or not.
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