Function rcudnn::cudnnBackendGetAttribute

pub unsafe extern "C" fn cudnnBackendGetAttribute(
    descriptor: *mut c_void, 
    attributeName: cudnnBackendAttributeName_t, 
    attributeType: cudnnBackendAttributeType_t, 
    requestedElementCount: i64, 
    elementCount: *mut i64, 
    arrayOfElements: *mut c_void
) -> cudnnStatus_t