Function dds_stream_countops 

pub unsafe extern "C" fn dds_stream_countops(
    ops: *const u32,
    nkeys: u32,
    keys: *const dds_key_descriptor_t,
) -> u32

@brief Count the number of CDR stream operations for a type. @component cdr_serializer

Includes any additional operations reachable through key offset descriptors.

@param ops marshalling metadata to inspect @param nkeys number of key descriptors in @p keys @param keys key descriptors, or NULL when @p nkeys is zero @returns number of operation words required