Overload A Function For A Virtual Table

Overload A Function For A Virtual Table

int sqlite3_overload_function(sqlite3*, const char *zFuncName, int nArg);

Virtual tables can provide alternative implementations of functions using the xFindFunction method of the virtual table module- But global versions of those functions must exist in order to be overloaded-

This API makes sure a global version of a function with a particular name and number of parameters exists- If no such function exists before this API is called, a new function is created- The implementation of the new function always causes an exception to be thrown- So the new function is not good for anything by itself- Its only purpose is to be a placeholder function that can be overloaded by a virtual table.

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