Macro impl_more::forward_deref_and_mut
source · macro_rules! forward_deref_and_mut { ($ty:ty => $target:ty) => { ... }; ($ty:ty => ref $target:ty) => { ... }; ($ty:ty => $field:ident : $target:ty) => { ... }; ($ty:ty => $field:ident : ref $target:ty) => { ... }; }
Expand description
Implements Deref
and DerefMut
by forwarding through an inner field’s implementation.
Use the ref <type>
form for deref-ing to types with lifetimes like &str
. For newtype
structs, only the struct name and deref target type is necessary.
Also see impl_deref_and_mut
.
§Examples
With a newtype struct:
struct MyNewTypeStruct(String);
impl_more::forward_deref_and_mut!(MyNewTypeStruct => ref str);
let mut foo = MyNewTypeStruct("one".to_owned());
let foo_ref: &str = &foo;
accepts_string_slice(&foo);
accepts_mut_string_slice(&mut foo);