mongoc_collection_ensure_index()
Synopsis
bool
mongoc_collection_ensure_index (mongoc_collection_t      *collection,
                                const bson_t             *keys,
                                const mongoc_index_opt_t *opt,
                                bson_error_t             *error)
   BSON_GNUC_DEPRECATED_FOR (mongoc_collection_create_index);Deprecated
This function is deprecated and should not be used in new code.
Please use mongoc_collection_create_index() instead.
Parameters
| collection | |
| keys | A bson_t. | 
| opt | A mongoc_index_opt_t. | 
| error | An optional location for a bson_error_t or NULL. | 
Errors
Errors are propagated via the error parameter.