Macro impl_as_mut

macro_rules! impl_as_mut {
    ($this:ident $(<$($generic:ident),+>)? => $inner:ty) => { ... };
    ($this:ident $(<$($generic:ident),+>)? => $field:ident : $inner:ty) => { ... };
}

Implement AsMut for a struct.

The first argument is that of the struct to create the impl for and the second is the type to produce a reference for.

Examples

With a newtype struct:

use impl_more::{impl_as_ref, impl_as_mut};

struct Foo(String);

impl_as_ref!(Foo => String);
impl_as_mut!(Foo => String);

let mut foo = Foo("bar".to_owned());
foo.as_mut().push('!');

assert_eq!(foo.as_ref(), "bar!");

With a named field struct and type parameters:

use impl_more::{impl_as_ref, impl_as_mut};

struct Foo<T> { inner: T }

impl_as_ref!(Foo<T> => inner: T);
impl_as_mut!(Foo<T> => inner: T);

let mut foo = Foo { inner: "bar".to_owned() };
foo.as_mut().push('!');

assert_eq!(foo.as_ref(), "bar!");