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add compile check at enum_name

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Neargye 2020-01-25 23:51:50 +05:00
parent 6b220c83fc
commit e3dd165a4a
2 changed files with 4 additions and 5 deletions
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5
include/magic_enum.hpp
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@ -511,7 +511,10 @@ template <typename E>
// This version is much lighter on the compile times and is not restricted to the enum_range limitation. // This version is much lighter on the compile times and is not restricted to the enum_range limitation.
template <auto V> template <auto V>
[[nodiscard]] constexpr auto enum_name() noexcept -> detail::enable_if_enum_t<decltype(V), std::string_view> { [[nodiscard]] constexpr auto enum_name() noexcept -> detail::enable_if_enum_t<decltype(V), std::string_view> {
return detail::name_v<std::decay_t<decltype(V)>, V>; constexpr std::string_view name = detail::name_v<std::decay_t<decltype(V)>, V>;
static_assert(name.size() > 0, "Enum value does not have a name.");
return name;
} }
// Returns string enum name from enum value. // Returns string enum name from enum value.

4
test/test.cpp
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@ -271,7 +271,6 @@ TEST_CASE("enum_name") {
REQUIRE(cr_name == "RED"); REQUIRE(cr_name == "RED");
REQUIRE(enum_name<Color::BLUE>() == "BLUE"); REQUIRE(enum_name<Color::BLUE>() == "BLUE");
REQUIRE(enum_name<cm[1]>() == "GREEN"); REQUIRE(enum_name<cm[1]>() == "GREEN");
REQUIRE(enum_name<static_cast<Color>(0)>().empty());
constexpr Numbers no = Numbers::one; constexpr Numbers no = Numbers::one;
constexpr auto no_name = enum_name<no>(); constexpr auto no_name = enum_name<no>();
@ -279,7 +278,6 @@ TEST_CASE("enum_name") {
REQUIRE(enum_name<Numbers::two>() == "two"); REQUIRE(enum_name<Numbers::two>() == "two");
REQUIRE(enum_name<Numbers::three>() == "three"); REQUIRE(enum_name<Numbers::three>() == "three");
REQUIRE(enum_name<Numbers::many>() == "many"); REQUIRE(enum_name<Numbers::many>() == "many");
REQUIRE(enum_name<static_cast<Numbers>(0)>().empty());
constexpr Directions dr = Directions::Right; constexpr Directions dr = Directions::Right;
constexpr auto dr_name = enum_name<dr>(); constexpr auto dr_name = enum_name<dr>();
@ -287,7 +285,6 @@ TEST_CASE("enum_name") {
REQUIRE(enum_name<Directions::Down>() == "Down"); REQUIRE(enum_name<Directions::Down>() == "Down");
REQUIRE(dr_name == "Right"); REQUIRE(dr_name == "Right");
REQUIRE(enum_name<Directions::Left>() == "Left"); REQUIRE(enum_name<Directions::Left>() == "Left");
REQUIRE(enum_name<static_cast<Directions>(0)>().empty());
constexpr number nt = number::three; constexpr number nt = number::three;
constexpr auto nt_name = enum_name<nt>(); constexpr auto nt_name = enum_name<nt>();
@ -295,7 +292,6 @@ TEST_CASE("enum_name") {
REQUIRE(enum_name<number::two>() == "two"); REQUIRE(enum_name<number::two>() == "two");
REQUIRE(nt_name == "three"); REQUIRE(nt_name == "three");
REQUIRE(enum_name<number::four>() == "four"); REQUIRE(enum_name<number::four>() == "four");
REQUIRE(enum_name<static_cast<number>(0)>().empty());
} }
} }