enum-as-inner

A deriving proc-macro for generating functions to automatically give access to the inner members of enum.

Basic unnamed field case

The basic case is meant for single item enums, like:

```rust

[macro_use]

extern crate enumasinner;

[derive(Debug, EnumAsInner)]

enum OneEnum { One(u32), } ```

where the inner item can be retrieved with the as_*() or with the into_*() functions:

```rust let one = OneEnum::One(1);

asserteq!(*one.asone().unwrap(), 1); asserteq!(one.intoone().unwrap(), 1); ```

where the result is either a reference for inner items or a tuple containing the inner items.

Unit case

This will return copy's of the value of the unit variant, as isize:

```rust

[macro_use]

extern crate enumasinner;

[derive(EnumAsInner)]

enum UnitVariants { Zero, One, Two, } ```

These are not references:

```rust let unit = UnitVariants::Two;

asserteq!(unit.astwo().unwrap(), ()); ```

Note that for unit enums there is no into_*() function generated.

Mutliple, unnamed field case

This will return a tuple of the inner types:

```rust

[macro_use]

extern crate enumasinner;

[derive(Debug, EnumAsInner)]

enum ManyVariants { One(u32), Two(u32, i32), Three(bool, u32, i64), } ```

And can be accessed like:

```rust let many = ManyVariants::Three(true, 1, 2);

asserteq!(many.asthree().unwrap(), (&true, &1u32, &2i64)); asserteq!(many.intothree().unwrap(), (true, 1u32, 2i64)); ```

Multiple, named field case

This will return a tuple of the inner types, like the unnamed option:

```rust

[macro_use]

extern crate enumasinner;

[derive(Debug, EnumAsInner)]

enum ManyVariants { One{ one: u32 }, Two{ one: u32, two: i32 }, Three{ one: bool, two: u32, three: i64 }, } ```

And can be accessed like:

```rust let many = ManyVariants::Three{ one: true, two: 1, three: 2 };

asserteq!(many.asthree().unwrap(), (&true, &1u32, &2i64)); asserteq!(many.intothree().unwrap(), (true, 1u32, 2i64)); ```