Derive Deref Macro

Crate derive-deref-rs is a macro library used to easily defined the Derive and DrerfMut trait of the core library.

How to use #[derive(Deref)]

• Structure with only one field:

#[derive(Deref)]
struct MyStruct {
    a: String
}

this will implement the Deref and DerefMut trait with the field a.

#[derive(Deref)]
struct MyStruct(String);

This will also work since it's have only one field.

• Structure with multiple fields:

struct MyStruct {
    #[deref]
    a: String,
    b: String
}

When a structure has multiple field, we need to tell which field will be used to dereference the structure. To do that, simply add #[deref] on the field you want to use. You can only use this attribute once, otherwise a compile error will occur.

Limitation of the macro.

• Does not support Enum and Union
• Only support tuple struct with only one field.
• Does not work on struct without any field.
• Can't dereference a structure with 2 fields with #[deref] attribute.