bool

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                  MONGOC_READ_CONCERN_SET_LEVEL(3)

       Sets the read concern level. See mongoc_read_concern_t for details.

       Beginning  in  version  1.9.0,  this function can now alter the read 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 return false instead of altering the read concern.

       • read_concern: A mongoc_read_concern_t.

       • level: The readConcern level to use.

       Returns true if the read concern level was set, or false otherwise.

          bool
          mongoc_read_concern_set_level (mongoc_read_concern_t *read_concern,
                                         const char *level);