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update enum_entries

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This commit is contained in:
terik23 2019-04-23 01:35:24 +05:00
parent eef1ac9339
commit 158c736a32
3 changed files with 29 additions and 6 deletions
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9
example/example.cpp
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@ -95,5 +95,14 @@ int main() {
static_assert(!magic_enum::is_scoped_enum_v<color>);
static_assert(magic_enum::is_scoped_enum_v<direction>);
// Enum pair (value enum, string enum name) sequence.
constexpr auto color_entries = magic_enum::enum_entries<Color>();
std::cout << "Colors entries:";
for (auto& e : color_entries) {
std::cout << " " << e.second << " = " << static_cast<int>(e.first);
}
std::cout << std::endl;
// Color entries: RED = -10 BLUE = 0 GREEN = 10
return 0;
}

12
include/magic_enum.hpp
View file

@ -170,12 +170,12 @@ template <typename E, std::size_t... I>
}
template <typename E, std::size_t... I>
[[nodiscard]] constexpr decltype(auto) pairs_impl(std::integer_sequence<std::size_t, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::pairs_impl requires enum type.");
[[nodiscard]] constexpr decltype(auto) entries_impl(std::integer_sequence<std::size_t, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::entries_impl requires enum type.");
constexpr auto values = values_impl<E>(range_impl<E>());
constexpr std::array<std::pair<E, std::string_view>, sizeof...(I)> pairs{{{values[I], name_impl<E, values[I]>()}...}};
constexpr std::array<std::pair<E, std::string_view>, sizeof...(I)> entries{{{values[I], name_impl<E, values[I]>()}...}};
return pairs;
return entries;
}
template<typename T>
@ -316,9 +316,9 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr decltype(auto) enum_entries() noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::enum_entries requires enum type.");
constexpr auto count = detail::values_impl<E>(detail::range_impl<E>()).size();
constexpr auto pairs = detail::pairs_impl<E>(std::make_index_sequence<count>{});
constexpr auto entries = detail::entries_impl<E>(std::make_index_sequence<count>{});
return pairs;
return entries;
}
namespace ops {

14
test/test.cpp
View file

@ -214,6 +214,20 @@ TEST_CASE("enum_names") {
REQUIRE(s4 == std::array<std::string_view, 3>{{"one", "two", "three"}});
}
TEST_CASE("enum_entries") {
constexpr auto s1 = magic_enum::enum_entries<Color>();
REQUIRE(s1 == std::array<std::pair<Color, std::string_view>, 3>{{{Color::RED, "RED"}, {Color::GREEN, "GREEN"}, {Color::BLUE, "BLUE"}}});
constexpr auto s2 = magic_enum::enum_entries<Numbers>();
REQUIRE(s2 == std::array<std::pair<Numbers, std::string_view>, 3>{{{Numbers::one, "one"}, {Numbers::two, "two"}, {Numbers::three, "three"}}});
constexpr auto s3 = magic_enum::enum_entries<Directions>();
REQUIRE(s3 == std::array<std::pair<Directions, std::string_view>, 4>{{{Directions::Left, "Left"}, {Directions::Down, "Down"}, {Directions::Up, "Up"}, {Directions::Right, "Right"}}});
constexpr auto s4 = magic_enum::enum_entries<number>();
REQUIRE(s4 == std::array<std::pair<number, std::string_view>, 3>{{{number::one, "one"}, {number::two, "two"}, {number::three, "three"}}});
}
TEST_CASE("operator<<") {
auto test_ostream = [](auto e, std::string_view name) {
using namespace magic_enum::ops;