gistfile1.cpp

std::unordered_set<mill::Object*> mill::GC::mark() const {
    std::unordered_set<Object*> result;
    auto helper = [&] (auto const& self, auto object) {
        if (result.count(object)) {
            return;
        }
        result.insert(object);
        for (auto&& field : object->type->fields()) {
            if (field->isBoxed) {
                self(self, field->template get<Object*>(object));
            }
        }
    };
    for (auto&& gcPtr : gcPtrs) {
        helper(helper, gcPtr->get());
    }
    return result;
}