mongoc_optional_set_value - Man Page

void
mongoc_optional_set_value (mongoc_optional_t *opt);

Sets a value on a mongoc_optional_t <>​. Once a value has been set, it cannot be unset, i.e. mongoc_optional_is_set will always return true after calling mongoc_optional_set_value​.

• opt: A mongoc_optional_t <>​.

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