Method contains

test-app/runtime/src/main/cpp/robin_hood.h:1913–1915

        }

        bool contains(const key_type& key) const { // NOLINT(modernize-use-nodiscard)
            return 1U == count(key);
        }

        template <typename OtherKey, typename Self_ = Self>
        // NOLINTNEXTLINE(modernize-use-nodiscard)