deriving_via

This library is a slightly more convenient version of derive_more.

Syntax

#[derive(DerivingVia)]
#[deriving(<Derive>...)]
struct Target(Base);

Derive := <Trait> | <Trait>(via = <Type>)

Example

In this example, the Inner does not derive the Eq or Display, but Outer derives them through the i32.

use deriving_via::DerivingVia;

#[derive(DerivingVia)]
pub struct Inner(i32);

#[derive(DerivingVia)]
#[deriving(Eq(via = i32), Display(via = i32))]
pub struct Outer(Inner);

fn main() {
    let x = Outer(Inner(42));
    let y = Outer(Inner(42));

    println!("{x} == {y} => {}", x == y);
    // 42 == 42 => true
}

Available Derives

struct Base(Underlying);

#[derive(DerivingVia)]
#[deriving(<Derive>...)]
struct Target(Base);

• Display
• Into
  • additional requires: Base: Into<Underlying>
• From
  • additional requires: Base: From<Underlying>
• Eq
• Ord
• TryFrom
  • additional requires: Base: From<Underlying>
• FromStr
  • additional requires: Base: From<Underlying>
• Hash
• serde::Serialize
• serde::Deserialize