#include <mongoc/mongoc.h>
typedef struct {


   bool is_initialized;


   bool background;


   bool unique;


   const char *name;


   bool drop_dups;


   bool sparse;


   int32_t expire_after_seconds;


   int32_t v;


   const bson_t *weights;


   const char *default_language;


   const char *language_override;


   mongoc_index_opt_geo_t *geo_options;


   mongoc_index_opt_storage_t *storage_options;


   const bson_t *partial_filter_expression;


   const bson_t *collation;


   void *padding[4];
} mongoc_index_opt_t;

dropDups is deprecated as of MongoDB version 3.0.0. This option is silently ignored by the server and unique index builds using this option will fail if a duplicate value is detected.

{


   bson_t keys;


   bson_error_t error;


   mongoc_index_opt_t opt;


   mongoc_index_opt_geo_t geo_opt;


   mongoc_index_opt_init (&opt);


   mongoc_index_opt_geo_init (&geo_opt);


   bson_init (&keys);


   BSON_APPEND_UTF8 (&keys, "location", "2d");


   geo_opt.twod_location_min = -123;


   geo_opt.twod_location_max = +123;


   geo_opt.twod_bits_precision = 30;


   opt.geo_options = &geo_opt;


   collection = mongoc_client_get_collection (client, "test", "geo_test");


   if (mongoc_collection_create_index (collection, &keys, &opt, &error)) {


      /* Successfully created the geo index */


   }


   bson_destroy (&keys);


   mongoc_collection_destroy (&collection);
}

mongoc_index_opt_geo_t

mongoc_index_opt_wt_t