46   std::string& ref = *opt;  in TEST()  local
47   EXPECT_TRUE(ref.empty());  in TEST()
48   ref = "xyz";  in TEST()
159     const auto ref = map.get('d').value_or(std::cref(d));  in TEST()  local
160     EXPECT_EQ(ref.get(), 'D');  in TEST()
170     const auto ref = map.get('d').value_or(std::ref(d));  in TEST()  local
171     ref.get() = 'D';  in TEST()
250     const auto ref = map.get(2, [](const auto& s) { return s.str[0]; });  in TEST()  local
251     ASSERT_TRUE(ref);  in TEST()
254     const auto it = map.try_replace(2, 1u, static_cast<char>(std::tolower(*ref)));  in TEST()
271     const auto ref = map.get(3);  in TEST()  local
272     ASSERT_TRUE(ref);  in TEST()
275     const auto it = map.try_replace(3, ref->get().str, 2u, 1u);  in TEST()
295     const auto ref = map.get(2, [](const auto& s) { return s.str[0]; });  in TEST()  local
296     ASSERT_TRUE(ref);  in TEST()
299     const auto [it, emplace] = map.emplace_or_replace(2, 1u, static_cast<char>(std::tolower(*ref)));  in TEST()
317     const auto ref = map.get(3);  in TEST()  local
318     ASSERT_TRUE(ref);  in TEST()
321     const auto [it, emplace] = map.emplace_or_replace(3, ref->get().str, 2u, 1u);  in TEST()