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add constexpr containers (#187)

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Bela Schaum 2023-01-17 15:59:37 +01:00 • committed by GitHub
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@ -42,6 +42,9 @@ Header-only C++17 library provides static reflection for enums, work with any en
* `underlying_type` improved UB-free "SFINAE-friendly" [underlying_type](https://en.cppreference.com/w/cpp/types/underlying_type).
* `ostream_operators` ostream operators for enums.
* `bitwise_operators` bitwise operators for enums.
* `containers::array` array container for enums.
* `containers::bitset` bitset container for enums.
* `containers::set` set container for enums.
## Documentation
@ -222,6 +225,40 @@ Header-only C++17 library provides static reflection for enums, work with any en
// color_name -> "BLUE"
```
* `containers::array` array container for enums.
```cpp
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.
```cpp
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.
```cpp
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
```
## Remarks
* `magic_enum` does not pretend to be a silver bullet for reflection for enums, it was originally designed for small enum.