sqlite3_overload_function
—
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.