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| static mysql_service_status_t  | argument_get (UDF_ARGS *udf_args, const char *extension_type, unsigned int index, void **out_value) noexcept | 
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| static mysql_service_status_t  | result_get (UDF_INIT *udf_init, const char *extension_type, void **argument) noexcept | 
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| static mysql_service_status_t  | argument_set (UDF_ARGS *udf_args, const char *extension_type, unsigned int index, void *in_value) noexcept | 
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| static mysql_service_status_t  | result_set (UDF_INIT *udf_init, const char *extension_type, void *argument) noexcept | 
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A helper class for the implementation of the udf_extension functions. 
Needed because we register these service implementations as part of the mysql_server component.