NAME

       mongoc_write_concern_set_w - mongoc_write_concern_set_w()

SYNOPSIS

          void
          mongoc_write_concern_set_w (mongoc_write_concern_t *write_concern, int32_t w);

PARAMETERS

       • write_concern: A mongoc_write_concern_t.

       • w: A positive int32_t or zero.

DESCRIPTION

       Sets the w value for the write concern. See mongoc_write_concern_t for more information on
       this setting.

       Unacknowledged writes are not causally consistent. If you execute a write operation with a
       mongoc_write_concern_t on which you have called mongoc_write_concern_set_w with a value of
       0, the write does not participate  in  causal  consistency,  even  when  executed  with  a
       mongoc_client_session_t.

       Beginning  in  version  1.9.0,  this function can now alter the write concern after it has
       been used in an operation. Previously, using the struct with an operation would mark it as
       "frozen"  and  calling  this  function would log a warning instead instead of altering the
       write concern.

AUTHOR

       MongoDB, Inc

COPYRIGHT

       2018, MongoDB, Inc