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@ -16,11 +16,11 @@
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## What is Magic Enum?
Header-only C++17 library provides Enum-to-String and String-to-Enum functions.
Header-only C++17 library provides Enum-to-String and String-to-Enum and other useful functions, without any macro or boilerplate code.
* `magic_enum::enum_cast` obtains enum value from string or integer.
* `magic_enum::enum_value` obtains indexed access to enum value.
* `magic_enum::enum_values` obtains enum value sequence.
@ -40,6 +40,11 @@ Header-only C++17 library provides Enum-to-String and String-to-Enum functions.
## [Examples](example/example.cpp)
```cpp
// For example color enum.
enum Color { RED = 2, BLUE = 4, GREEN = 8 };
```
* Enum value to string
```cpp
Color color = Color::RED;
@ -60,24 +65,49 @@ Header-only C++17 library provides Enum-to-String and String-to-Enum functions.
* String to enum value
```cpp
constexpr auto color = magic_enum::enum_cast<Color>("GREEN");
std::string color_name{"GREEN"};
auto color = magic_enum::enum_cast<Color>(color_name);
if (color.has_value()) {
// color.value() -> Color::GREEN
}
```
* Static storage string to enum value
```cpp
constexpr auto color = magic_enum::enum_cast<Color>("BLUE");
if (color.has_value()) {
// color.value() -> Color::BLUE
}
```
* Integer to enum value
```cpp
constexpr auto color = magic_enum::enum_cast<Color>(0);
if (color.has_value()) {
int color_value = 2;
auto color = magic_enum::enum_cast<Color>(color_value);
if (colo.has_value()) {
// color.value() -> Color::RED
}
```
* Static storage integer to enum value
```cpp
constexpr auto color = magic_enum::enum_cast<Color>(4);
if (color.has_value()) {
// color.value() -> Color::BLUE
}
```
* Indexed access to enum value
```cpp
constexpr Color color_value = magic_enum::enum_value<Color>(0);
// color_element -> Color::RED
int i = 1;
Color colo = magic_enum::enum_value<Color>(i);
// color -> Color::BLUE
```
* Compile-time indexed access.
```cpp
constexpr Color color = magic_enum::enum_value<Color>(0);
// color -> Color::RED
```
* Enum value sequence
@ -88,11 +118,11 @@ Header-only C++17 library provides Enum-to-String and String-to-Enum functions.
* Number of enum elements
```cpp
constexpr std::size_t color_size = magic_enum::enum_count<Color>();
// color_size -> 3
constexpr std::size_t color_count = magic_enum::enum_count<Color>();
// color_count -> 3
```
* Enum string sequence
* Enum names sequence
```cpp
constexpr auto color_names = magic_enum::enum_names<Color>();
// color_names -> {"RED", "BLUE", "GREEN"}
@ -109,11 +139,11 @@ Header-only C++17 library provides Enum-to-String and String-to-Enum functions.
* `magic_enum::enum_cast` returns `std::optional<E>`, using `has_value()` to check contains enum value and `value()` to get the enum value.
* `magic_enum::enum_values` returns `std::array<E, N>` with all enum value, sorted by enum value.
* `magic_enum::enum_values` returns `std::array<E, N>` with all enum value where `N = number of enum values`, sorted by enum value.
* `magic_enum::enum_name` returns `std::optional<std::string_view>`, using `has_value()` to check contains enum name and `value()` to get the enum name.
* `magic_enum::enum_names` returns `std::array<std::string_view, N>` with all string enum name, sorted by enum value.
* `magic_enum::enum_names` returns `std::array<std::string_view, N>` with all string enum name where `N = number of enum values`, sorted by enum value.
* Enum value must be in range `(-MAGIC_ENUM_RANGE, MAGIC_ENUM_RANGE)`. By default `MAGIC_ENUM_RANGE = 128`. If you need larger range, redefine the macro `MAGIC_ENUM_RANGE`.
```cpp