Crate enum-tools

Automatically derive functions and trait implementations for enums.

The enum must be field-less, has a primitive representation and be Copy.

Many helpful function can be derived: - Into/TryFrom primitive - iterator over all items and/or names - next/previous item - from/to string - and more

For the full documentation see EnumTools.

Example

```rust

[derive(Clone, Copy, EnumTools)]

// features which create function/constant

[enumtools(asstr, fromstr, into, MAX, MIN, next, nextback, try_from)]

// features which implement a trait

[enum_tools(Debug, Display, FromStr, Into, IntoStr, TryFrom)]

// features which create a iterator (function and struct with impl)

[enum_tools(iter, names, range)]

[repr(i8)]

pub enum MyEnum { A=0, B=5, C=1 } ```

Derives something similar as below

```rust // functions on the enum impl MyEnum { pub const MIN : Self = MyEnum::A; pub const MAX : Self = MyEnum::B; pub fn asstr(self) -> &'static str pub fn fromstr(s: &str) -> Option pub fn into(self) -> i8 { self as i8 } pub fn next(self) -> Option // the next element by value (or None if last) pub fn nextback(self) -> Option // the previous element by value (or None if first) pub fn tryfrom(value: i8) -> Option

pub fn iter() -> MyEnumIter // a iterator over all elements by value
pub fn names() -> MyEnumNames // a iterator over all names by value
pub fn range(start: Self, end: Self) -> MyEnumIter // similar to `..=`

}

// implementations on the enum impl Debug for MyEnum // calls as_str impl Display for MyEnum // calls as_str impl From for i8 // feature "Into" impl From for &'static str // feature "IntoStr", calls "as_str" impl FromStr for MyEnum impl TryFrom for MyEnum

// structs and impls for the iterators pub struct MyEnumIter impl Iterator for MyEnumIter impl DoubleEndedIterator for MyEnumIter impl ExactSizeIterator for MyEnumIter impl FusedIterator for MyEnumIter pub struct MyEnumNames impl Iterator for MyEnumNames impl DoubleEndedIterator for MyEnumNames impl ExactSizeIterator for MyEnumNames impl FusedIterator for MyEnumNames ```