Provided by: libbson-doc_1.9.2-1_all 
NAME
bson_count_keys - bson_count_keys()
SYNOPSIS
uint32_t
bson_count_keys (const bson_t *bson);
PARAMETERS
• bson: A bson_t.
DESCRIPTION
The bson_count_keys() function shall count the number of elements within bson.
RETURNS
A positive integer or zero.
AUTHOR
MongoDB, Inc
COPYRIGHT
2018, MongoDB, Inc