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Enum switch (#168)

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Bela Schaum 2022-03-18 13:07:00 +01:00 • committed by GitHub
parent 542aacea41
commit 64bedded2a
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6 changed files with 288 additions and 11 deletions
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55
test/test.cpp
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@ -1018,6 +1018,61 @@ TEST_CASE("cmp_less") {
}
}
template<Color C>
constexpr std::string_view DoWork() {
return "default";
}
template<>
constexpr std::string_view DoWork<Color::GREEN>() {
return "override";
}
TEST_CASE("enum_switch") {
constexpr auto bind_enum_switch = [] (Color c) {
return enum_switch([](auto val) {
return DoWork<val>();
}, c, string_view{"unrecognized"});
};
constexpr auto def = bind_enum_switch(Color::BLUE);
REQUIRE(def == "default");
REQUIRE(bind_enum_switch(Color::RED) == "default");
REQUIRE(bind_enum_switch(Color::GREEN) == "override");
REQUIRE(bind_enum_switch(static_cast<Color>(0)) == "unrecognized");
}
TEST_CASE("enum_for_each") {
SECTION("no return type") {
underlying_type_t<Color> sum{};
enum_for_each<Color>([&sum](auto val) {
constexpr underlying_type_t<Color> v = enum_integer(val());
sum += v;
});
REQUIRE(sum == 10);
}
SECTION("same return type") {
constexpr auto workResults = enum_for_each<Color>([](auto val) {
return DoWork<val>();
});
REQUIRE(workResults == std::array<std::string_view, 3>{"default", "override", "default"});
}
SECTION("different return type") {
constexpr auto colorInts = enum_for_each<Color>([](auto val) {
return val;
});
REQUIRE(std::is_same_v<std::remove_const_t<decltype(colorInts)>, std::tuple<
std::integral_constant<Color, Color::RED>,
std::integral_constant<Color, Color::GREEN>,
std::integral_constant<Color, Color::BLUE>
>>);
}
}
#if defined(__clang__) && __clang_major__ >= 5 || defined(__GNUC__) && __GNUC__ >= 9 || defined(_MSC_VER) && _MSC_VER >= 1920
# define MAGIC_ENUM_SUPPORTED_CONSTEXPR_FOR 1
#endif