#include <bson/bson.h>
typedef enum {


   BSON_TYPE_EOD = 0x00,


   BSON_TYPE_DOUBLE = 0x01,


   BSON_TYPE_UTF8 = 0x02,


   BSON_TYPE_DOCUMENT = 0x03,


   BSON_TYPE_ARRAY = 0x04,


   BSON_TYPE_BINARY = 0x05,


   BSON_TYPE_UNDEFINED = 0x06,


   BSON_TYPE_OID = 0x07,


   BSON_TYPE_BOOL = 0x08,


   BSON_TYPE_DATE_TIME = 0x09,


   BSON_TYPE_NULL = 0x0A,


   BSON_TYPE_REGEX = 0x0B,


   BSON_TYPE_DBPOINTER = 0x0C,


   BSON_TYPE_CODE = 0x0D,


   BSON_TYPE_SYMBOL = 0x0E,


   BSON_TYPE_CODEWSCOPE = 0x0F,


   BSON_TYPE_INT32 = 0x10,


   BSON_TYPE_TIMESTAMP = 0x11,


   BSON_TYPE_INT64 = 0x12,


   BSON_TYPE_DECIMAL128 = 0x13,


   BSON_TYPE_MAXKEY = 0x7F,


   BSON_TYPE_MINKEY = 0xFF,
} bson_type_t;

bson_iter_t iter;
if (bson_iter_init_find (&iter, doc, "foo") &&


    (BSON_TYPE_INT32 == bson_iter_type (&iter))) {


   printf ("'foo' is an int32.\n");
}