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In languages without static typing it is not practical to use a virtual table, since such a table would need to encode all methods, not simply those in a given class hierarchy.
An alternative technique uses a pointer to a list of selector/method pairs.
When a method is invoked, a run-time search is performed to match the method being called with the list of known selectors, until an appropriate method is found.
In Objective-C the message
[ neighbor checkrow: row column: column ]
is translated into
objc_msgSend(neighbor, "checkrow:column:", row, column)