Static reflection for enums (to string, from string, iteration) for modern C++, work with any enum type without any macro or boilerplate code
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| |\/| |/ _` |/ _` | |/ __| | __| | '_ \| | | | '_ ` _ \ | | |_ _|_ _|
| | | | (_| | (_| | | (__ | |____| | | | |_| | | | | | | | |____|_| |_|
|_| |_|\__,_|\__, |_|\___| |______|_| |_|\__,_|_| |_| |_| \_____|
__/ |
|___/
Magic Enum C++
Header-only C++17 library provides static reflection for enums, work with any enum type without any macro or boilerplate code.
Documentation
Examples
-
Enum value to string
Color color = Color::RED; auto color_name = magic_enum::enum_name(color); // color_name -> "RED"
-
String to enum value
std::string color_name{"GREEN"}; auto color = magic_enum::enum_cast<Color>(color_name); if (color.has_value()) { // color.value() -> Color::GREEN } auto color_or_default = magic_enum::enum_cast<Color>(value).value_or(Color::NONE);
-
Integer to enum value
int color_integer = 2; auto color = magic_enum::enum_cast<Color>(color_integer); if (color.has_value()) { // color.value() -> Color::BLUE } auto color_or_default = magic_enum::enum_cast<Color>(value).value_or(Color::NONE);
-
Indexed access to enum value
std::size_t i = 0; Color color = magic_enum::enum_value<Color>(i); // color -> Color::RED
-
Enum value sequence
constexpr auto colors = magic_enum::enum_values<Color>(); // colors -> {Color::RED, Color::BLUE, Color::GREEN} // colors[0] -> Color::RED
-
Number of enum elements
constexpr std::size_t color_count = magic_enum::enum_count<Color>(); // color_count -> 3
-
Enum value to integer
Color color = Color::RED; auto color_integer = magic_enum::enum_integer(color); // or magic_enum::enum_underlying(color); // color_integer -> 1
-
Enum names sequence
constexpr auto color_names = magic_enum::enum_names<Color>(); // color_names -> {"RED", "BLUE", "GREEN"} // color_names[0] -> "RED"
-
Enum entries sequence
constexpr auto color_entries = magic_enum::enum_entries<Color>(); // color_entries -> {{Color::RED, "RED"}, {Color::BLUE, "BLUE"}, {Color::GREEN, "GREEN"}} // color_entries[0].first -> Color::RED // color_entries[0].second -> "RED"
-
Enum fusion for multi-level switch/case statements
switch (magic_enum::enum_fuse(color, direction).value()) { case magic_enum::enum_fuse(Color::RED, Directions::Up).value(): // ... case magic_enum::enum_fuse(Color::BLUE, Directions::Down).value(): // ... // ... }
-
Enum switch runtime value as constexpr constant
Color color = Color::RED; magic_enum::enum_switch([] (auto val) { constexpr Color c_color = val; // ... }, color);
-
Enum iterate for each enum as constexpr constant
magic_enum::enum_for_each<Color>([] (auto val) { constexpr Color c_color = val; // ... });
-
Check if enum contains
magic_enum::enum_contains(Color::GREEN); // -> true magic_enum::enum_contains<Color>(2); // -> true magic_enum::enum_contains<Color>(123); // -> false magic_enum::enum_contains<Color>("GREEN"); // -> true magic_enum::enum_contains<Color>("fda"); // -> false
-
Enum index in sequence
constexpr auto color_index = magic_enum::enum_index(Color::BLUE); // color_index.value() -> 1 // color_index.has_value() -> true
-
Functions for flags
enum Directions : std::uint64_t { Left = 1, Down = 2, Up = 4, Right = 8, }; template <> struct magic_enum::customize::enum_range<Directions> { static constexpr bool is_flags = true; }; magic_enum::enum_flags_name(Directions::Up | Directions::Right); // directions_name -> "Directions::Up|Directions::Right" magic_enum::enum_flags_contains(Directions::Up | Directions::Right); // -> true magic_enum::enum_flags_cast(3); // -> "Directions::Left|Directions::Down"
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Enum type name
Color color = Color::RED; auto type_name = magic_enum::enum_type_name<decltype(color)>(); // type_name -> "Color"
-
IOstream operator for enum
using namespace magic_enum::ostream_operators; // out-of-the-box ostream operators for enums. Color color = Color::BLUE; std::cout << color << std::endl; // "BLUE" using namespace magic_enum::ostream_operators; // out-of-the-box ostream operators for enums. Color color = Color::BLUE; std::cout << color << std::endl; // "BLUE"
-
Bitwise operator for enum
enum class Flags { A = 1 << 0, B = 1 << 1, C = 1 << 2, D = 1 << 3 }; using namespace magic_enum::bitwise_operators; // out-of-the-box bitwise operators for enums. // Support operators: ~, |, &, ^, |=, &=, ^=. Flags flags = Flags::A | Flags::B & ~Flags::C;
-
Checks whether type is an Unscoped enumeration.
enum color { red, green, blue }; enum class direction { left, right }; magic_enum::is_unscoped_enum<color>::value -> true magic_enum::is_unscoped_enum<direction>::value -> false magic_enum::is_unscoped_enum<int>::value -> false // Helper variable template. magic_enum::is_unscoped_enum_v<color> -> true
-
Checks whether type is an Scoped enumeration.
enum color { red, green, blue }; enum class direction { left, right }; magic_enum::is_scoped_enum<color>::value -> false magic_enum::is_scoped_enum<direction>::value -> true magic_enum::is_scoped_enum<int>::value -> false // Helper variable template. magic_enum::is_scoped_enum_v<direction> -> true
-
Static storage enum variable to string This version is much lighter on the compile times and is not restricted to the enum_range limitation.
constexpr Color color = Color::BLUE; constexpr auto color_name = magic_enum::enum_name<color>(); // color_name -> "BLUE"
-
containers::array
array container for enums.magic_enum::containers::array<Color, RGB> color_rgb_array {}; color_rgb_array[Color::RED] = {255, 0, 0}; color_rgb_array[Color::GREEN] = {0, 255, 0}; color_rgb_array[Color::BLUE] = {0, 0, 255}; std::get<Color::BLUE>(color_rgb_array) // -> RGB{0, 0, 255}
-
containers::bitset
bitset container for enums.constexpr magic_enum::containers::bitset<Color> color_bitset_red_green {Color::RED|Color::GREEN}; bool all = color_bitset_red_green.all(); // all -> false // Color::BLUE is missing bool test = color_bitset_red_green.test(Color::RED); // test -> true
-
containers::set
set container for enums.auto color_set = magic_enum::containers::set<Color>(); bool empty = color_set.empty(); // empty -> true color_set.insert(Color::GREEN); color_set.insert(Color::BLUE); color_set.insert(Color::RED); std::size_t size = color_set.size(); // size -> 3
-
Improved UB-free "SFINAE-friendly" underlying_type.
magic_enum::underlying_type<color>::type -> int // Helper types. magic_enum::underlying_type_t<Direction> -> int
Remarks
-
magic_enum
does not pretend to be a silver bullet for reflection for enums, it was originally designed for small enum. -
Before use, read the limitations of functionality.
Integration
-
You should add the required file magic_enum.hpp.
-
If you are using vcpkg on your project for external dependencies, then you can use the magic-enum package.
-
If you are using Conan to manage your dependencies, merely add
magic_enum/x.y.z
to your conan's requires, wherex.y.z
is the release version you want to use. -
If you are using Build2 to build and manage your dependencies, add
depends: magic_enum ^x.y.z
to the manifest file wherex.y.z
is the release version you want to use. You can then import the target usingmagic_enum%lib{magic_enum}
. -
Alternatively, you can use something like CPM which is based on CMake's
Fetch_Content
module.CPMAddPackage( NAME magic_enum GITHUB_REPOSITORY Neargye/magic_enum GIT_TAG x.y.z # Where `x.y.z` is the release version you want to use. )
-
Bazel is also supported, simply add to your WORKSPACE file:
http_archive( name = "magic_enum", strip_prefix = "magic_enum-<commit>", urls = ["https://github.com/Neargye/magic_enum/archive/<commit>.zip"], )
To use bazel inside the repository it's possible to do:
bazel build //... bazel test //... bazel run //example
(Note that you must use a supported compiler or specify it with
export CC= <compiler>
.) -
If you are using Ros, you can include this package by adding
<depend>magic_enum</depend>
to your package.xml and include this package in your workspace. In your CMakeLists.txt add the following:find_package(magic_enum CONFIG REQUIRED) ... target_link_libraries(your_executable magic_enum::magic_enum)
Compiler compatibility
- Clang/LLVM >= 5
- MSVC++ >= 14.11 / Visual Studio >= 2017
- Xcode >= 10
- GCC >= 9
- MinGW >= 9
Licensed under the MIT License
version | 0.9.1 |
---|---|
license | MIT License |
repository | https://pkg.cppget.org/1/alpha |
download | magic_enum-0.9.1.tar.gz |
sha256 | 5de0e8540d83b8d398be70d9a4b969b275b23f4ae86efe72965c01730f66af0f |
project | magic_enum |
---|---|
doc-url | github.com/Neargye/magic_enum/blob/master/doc/reference.md |
src-url | github.com/Neargye/magic_enum |
package-email | wmbat-dev@protonmail.com |
topics | Enumreflection |
Requires (1)
c++ >= 17 |
Tests
magic_enum-tests == 0.9.1 |
Builds
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-gcc_13-static_O3 |
timestamp | 2024-05-13 22:47:19 UTC (03:52:58 hours ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-gcc_13-O3 |
timestamp | 2024-05-13 22:46:40 UTC (03:53:37 hours ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-gcc_13-ndebug_O3 |
timestamp | 2024-05-13 22:46:40 UTC (03:53:38 hours ago) |
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toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-gcc_13 |
timestamp | 2024-05-13 22:46:03 UTC (03:54:15 hours ago) |
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target | x86_64-apple-darwin22.5.0 |
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timestamp | 2024-05-13 14:44:01 UTC (11:56:17 hours ago) |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_14.0-O3 |
timestamp | 2024-05-13 14:43:13 UTC (11:57:05 hours ago) |
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toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_14.0 |
timestamp | 2024-05-13 14:42:27 UTC (11:57:51 hours ago) |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_15_libc++ |
timestamp | 2024-05-13 08:47:28 UTC (17:52:49 hours ago) |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_15 |
timestamp | 2024-05-13 08:47:01 UTC (17:53:16 hours ago) |
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target | aarch64-linux-gnu |
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timestamp | 2024-05-13 08:44:15 UTC (17:56:02 hours ago) |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16_libc++-static_O3 |
timestamp | 2024-05-13 01:33:03 UTC (01 01:07:14 days ago) |
result | success | log | rebuild |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16_libc++-O3 |
timestamp | 2024-05-13 01:32:20 UTC (01 01:07:57 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16_libc++ |
timestamp | 2024-05-13 01:30:48 UTC (01 01:09:29 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16-static_O3 |
timestamp | 2024-05-13 01:30:14 UTC (01 01:10:03 days ago) |
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toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16-O3 |
timestamp | 2024-05-13 01:29:13 UTC (01 01:11:04 days ago) |
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toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16 |
timestamp | 2024-05-13 01:28:25 UTC (01 01:11:52 days ago) |
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target | x86_64-linux-gnu |
tgt config | linux_fedora_38-gcc_13-bindist |
timestamp | 2024-05-12 09:11:45 UTC (01 17:28:32 days ago) |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-gcc_13_homebrew-static_O3 |
timestamp | 2024-05-12 04:00:33 UTC (01 22:39:44 days ago) |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-gcc_13_homebrew-O3 |
timestamp | 2024-05-12 03:59:43 UTC (01 22:40:34 days ago) |
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toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-gcc_13_homebrew |
timestamp | 2024-05-12 03:57:43 UTC (01 22:42:34 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_fedora_37-gcc_12.2-bindist |
timestamp | 2024-05-12 03:42:35 UTC (01 22:57:42 days ago) |
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toolchain | public-0.16.0 |
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target | x86_64-w64-mingw32 |
tgt config | windows_10-gcc_12.2_mingw_w64-O2 |
timestamp | 2024-05-11 23:54:22 UTC (02 02:45:55 days ago) |
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toolchain | public-0.16.0 |
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target | x86_64-w64-mingw32 |
tgt config | windows_10-gcc_12.2_mingw_w64-static_O2 |
timestamp | 2024-05-11 23:53:36 UTC (02 02:46:41 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-msvc_17.6-static_O2 |
timestamp | 2024-05-11 23:53:35 UTC (02 02:46:43 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-clang_16.0_llvm_msvc_17.6-static_O2 |
timestamp | 2024-05-11 23:53:13 UTC (02 02:47:04 days ago) |
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toolchain | public-0.16.0 |
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target | x86_64-w64-mingw32 |
tgt config | windows_10-gcc_12.2_mingw_w64 |
timestamp | 2024-05-11 23:53:01 UTC (02 02:47:17 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-clang_16.0_llvm_msvc_17.6-O2 |
timestamp | 2024-05-11 23:52:55 UTC (02 02:47:23 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-msvc_17.6 |
timestamp | 2024-05-11 23:52:51 UTC (02 02:47:26 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-msvc_17.5 |
timestamp | 2024-05-11 23:52:28 UTC (02 02:47:49 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-msvc_17.6-O2 |
timestamp | 2024-05-11 23:52:28 UTC (02 02:47:49 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-clang_15.0_msvc_msvc_17.6 |
timestamp | 2024-05-11 23:52:24 UTC (02 02:47:54 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-clang_16.0_llvm_msvc_17.6 |
timestamp | 2024-05-11 23:51:51 UTC (02 02:48:26 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0_libc++-O3 |
timestamp | 2024-05-11 23:48:21 UTC (02 02:51:56 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0_libc++-static_O3 |
timestamp | 2024-05-11 23:47:43 UTC (02 02:52:34 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-freebsd13.2 |
tgt config | freebsd_13-clang_14.0-static_O3 |
timestamp | 2024-05-11 23:47:29 UTC (02 02:52:48 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0-static_O3 |
timestamp | 2024-05-11 23:47:24 UTC (02 02:52:53 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0_libc++ |
timestamp | 2024-05-11 23:47:02 UTC (02 02:53:15 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-freebsd13.2 |
tgt config | freebsd_13-clang_14.0 |
timestamp | 2024-05-11 23:46:49 UTC (02 02:53:28 days ago) |
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toolchain | public-0.16.0 |
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target | x86_64-freebsd13.2 |
tgt config | freebsd_13-clang_14.0-O3 |
timestamp | 2024-05-11 23:46:48 UTC (02 02:53:30 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0-O3 |
timestamp | 2024-05-11 23:46:41 UTC (02 02:53:37 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0 |
timestamp | 2024-05-11 23:46:25 UTC (02 02:53:52 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_13.1-ndebug_O3 |
timestamp | 2024-05-11 23:46:19 UTC (02 02:53:59 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-freebsd12.4 |
tgt config | freebsd_12-clang_13.0 |
timestamp | 2024-05-11 23:46:18 UTC (02 02:53:59 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_13.1-static_O3 |
timestamp | 2024-05-11 23:46:04 UTC (02 02:54:13 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_13.1-O3 |
timestamp | 2024-05-11 23:45:43 UTC (02 02:54:35 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_12-bindist |
timestamp | 2024-05-11 23:45:33 UTC (02 02:54:44 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_13.1 |
timestamp | 2024-05-11 23:45:18 UTC (02 02:55:00 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_15.0_libc++ |
timestamp | 2024-05-11 23:44:55 UTC (02 02:55:23 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_15.0 |
timestamp | 2024-05-11 23:44:12 UTC (02 02:56:06 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_11-gcc_12.1 |
timestamp | 2024-05-11 23:42:25 UTC (02 02:57:53 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_15.0-static_O3 |
timestamp | 2024-05-11 23:29:26 UTC (02 03:10:52 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_15.0-O3 |
timestamp | 2024-05-11 23:28:00 UTC (02 03:12:17 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_15.0 |
timestamp | 2024-05-11 23:26:59 UTC (02 03:13:18 days ago) |
result | success | log | rebuild |