35 using ftl::Optional;
38 TEST(Optional, Construct) {  in TEST()  argument
40   EXPECT_EQ(std::nullopt, Optional<int>());  in TEST()
41   EXPECT_EQ(std::nullopt, Optional<std::string>(std::nullopt));  in TEST()
44   EXPECT_EQ('?', Optional('?'));  in TEST()
45   EXPECT_EQ(""s, Optional(std::string()));  in TEST()
48   EXPECT_EQ("???"s, Optional<std::string>(std::in_place, 3u, '?'));  in TEST()
49   EXPECT_EQ("abc"s, Optional<std::string>(std::in_place, {'a', 'b', 'c'}));  in TEST()
53     Optional opt = std::optional("test"s);  in TEST()
54     static_assert(std::is_same_v<decltype(opt), Optional<std::string>>);  in TEST()
61 TEST(Optional, Transform) {  in TEST()  argument
63   EXPECT_EQ(std::nullopt, Optional<int>().transform([](int) { return 0; }));  in TEST()
66   EXPECT_EQ(0, Optional(0).transform([](int x) { return x; }));  in TEST()
67   EXPECT_EQ(100, Optional(99).transform([](int x) { return x + 1; }));  in TEST()
68   EXPECT_EQ("0b100"s, Optional(4).transform(std::bind(ftl::to_string<int>, _1, ftl::Radix::kBin)));  in TEST()
72     Optional opt = 'x';  in TEST()
84     EXPECT_EQ("xyz"s, Optional("abc"s).transform([&out](std::string&& str) {  in TEST()
94     Optional opt = "food"s;  in TEST()
100   EXPECT_EQ(14u, Optional(StaticVector{"upside"s, "down"s})  in TEST()
113 Optional<int> parse_int(const std::string& str) {  in parse_int()
120 TEST(Optional, AndThen) {  in TEST()  argument
122   EXPECT_EQ(std::nullopt, Optional<int>().and_then([](int) -> Optional<int> { return 0; }));  in TEST()
123   EXPECT_EQ(std::nullopt, Optional<int>().and_then([](int) { return Optional<int>(); }));  in TEST()
126   EXPECT_EQ(0, Optional(0).and_then([](int x) { return Optional(x); }));  in TEST()
127   EXPECT_EQ(123, Optional("123").and_then(parse_int));  in TEST()
128   EXPECT_EQ(std::nullopt, Optional("abc").and_then(parse_int));  in TEST()
132     Optional opt = 'x';  in TEST()
135       return Optional('z');  in TEST()
144     EXPECT_EQ("xyz"s, Optional("abc"s).and_then([&out](std::string&& str) {  in TEST()
146       return Optional("xyz"s);  in TEST()
154   EXPECT_EQ(14u, Optional(StaticVector{"-"s, "1"s})  in TEST()
155                      .and_then([](StringVector&& v) -> Optional<StringVector> {  in TEST()
159                      .and_then([](const StringVector& v) -> Optional<std::string> {  in TEST()
169 TEST(Optional, OrElse) {  in TEST()  argument
172     const Optional opt = false;  in TEST()
173     EXPECT_EQ(false, opt.or_else([] { return Optional(true); }));  in TEST()
174     EXPECT_EQ('x', Optional('x').or_else([] { return std::make_optional('y'); }));  in TEST()
179     const Optional<int> opt;  in TEST()
180     EXPECT_EQ(123, opt.or_else([]() -> Optional<int> { return 123; }));  in TEST()
181     EXPECT_EQ("abc"s, Optional<std::string>().or_else([] { return Optional("abc"s); }));  in TEST()
185     EXPECT_EQ(Optional<float>(), Optional<float>().or_else([&empty]() -> Optional<float> {  in TEST()
194   EXPECT_EQ(999, Optional(StaticVector{"1"s, "0"s, "0"s})  in TEST()
195                      .and_then([](StringVector&& v) -> Optional<StringVector> {  in TEST()
200                        return Optional(StaticVector{"9"s, "9"s, "9"s});  in TEST()
206                      .or_else([] { return Optional(-1); }));  in TEST()
209 TEST(Optional, OkOr) {  in TEST()  argument
213   EXPECT_EQ(CharExp('z'), Optional('z').ok_or(std::errc::broken_pipe));  in TEST()
215             Optional<char>().ok_or(std::errc::broken_pipe));  in TEST()
217   EXPECT_EQ(StringExp("abc"s), Optional("abc"s).ok_or(std::errc::protocol_error));  in TEST()
219             Optional<std::string>().ok_or(std::errc::protocol_error));  in TEST()
225 constexpr Optional<int> kOptional1 = 1;
226 constexpr Optional<int> kAnotherOptional1 = 1;
227 constexpr Optional<int> kOptional2 = 2;
228 constexpr Optional<int> kOptionalEmpty, kAnotherOptionalEmpty;