SYNOPSIS
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.
PARAMETERS
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opt: A mongoc_optional_t.
AUTHOR
MongoDB, Inc
COPYRIGHT
2009-present, MongoDB, Inc.