#define BSON_APPEND_VALUE(b, key, val) \

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                              BSON_APPEND_VALUE(3)

       Appends  a  new  field to bson by determining the boxed type in value. This is useful if you want to copy
       fields between documents but do not know the field type until runtime.

       • bson: A bson_t.

       • key: An ASCII C string containing the name of the field.

       • key_length: The length of key in bytes, or -1 to determine the length with strlen().

       • value: A bson_value_t.

       Returns true if the operation was applied successfully. The function will fail  if  appending  the  value
       grows bson larger than INT32_MAX.

          #define BSON_APPEND_VALUE(b, key, val) \
             bson_append_value (b, key, (int) strlen (key), (val))

          bool
          bson_append_value (bson_t *bson,
                             const char *key,
                             int key_length,
                             const bson_value_t *value);