enum-methods

Enum getter/is_XXX method generation.

crates.io

In your Cargo.toml, add this line under your [dependencies] section:

toml,no_run enum-methods = "0.0.4"

To use, simply derive and call methods (see the example below).

Usually when you write an enum with one or zero values, you might want to add a set of getters for them. As such:

```rust

enum MyEnum { Foo(i64), Bar(char), Baz(String), }

impl MyEnum { pub fn foo(&self) -> i64 { if let &MyEnum::Foo(i) = self { i } else { panic!("called MyEnum::Foo() on {:?}", self) } } // et cetera }

```

But this gets tedious, and adds a lot code for this simple functionality. Enter enum-methods.

Instead of doing the above with the if let ... else { panic!(...) }, you simply derive from the EnumGetters

```rust

extern crate enum_methods;

enum MyEnum { Foo(i64), Bar(char), Baz(String), }

fn main() { let foo = MyEnum::Foo(42); assert_eq!(foo.foo(), 42); // success! } ```

Right now, enum-methods has only two derivable options: * EnumGetters * EnumIsA

EnumGetters has a couple of limitations.

Any enum variant which has exactly 1 member will have a getter generated for it. All other variants are ignored.
Enums which derive from EnumGetters must also derive from Debug - this is for when a method is called for the wrong variant and needs to panic!.

EnumIsA is much simpler than the previous; it simply adds is_XXX methods returning a boolean for whether the variant matches or not.

For both methods, all names are automatically converted to snake_case.

This software is released under the Apache license 2.0. See the LICENSE file for more details.