Allows to get how many groups are created.
INVOCATION METHOD: This function allows to perform a asynchronous remote invocation for the service "af_kernel::af_group::num_elements".
|usr_function ||An Asynchronous handler where the AfDalSimpleData value will be received. |
|usr_data ||User defined data to be passed in to the process function defined by usr_function.|
- TRUE if asynchronous request was sent to remote server (af_kernel). FALSE if there was an error while making remote service invocation.