mongoc_write_concern_append()
Synopsis
bool
mongoc_write_concern_append (mongoc_write_concern_t *write_concern,
                             bson_t                 *command);    Parameters
| write_concern | A pointer to a mongoc_write_concern_t. | 
| command | A pointer to a bson_t. | 
Description
This function appends a write concern to command options. It is useful for appending a write concern to command options before passing them to mongoc_client_write_command_with_opts or a related function that takes an options document.
Returns
Returns true on success, and false otherwise.
Example
See the example code for mongoc_client_read_command_with_opts.