Macro forward_lower_hex 

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

Implement LowerHex by forwarding to a field.

The formatter is passed through unchanged. Emitted code supports no_std. Omit the field for a tuple newtype. All type parameters receive a LowerHex bound.

Examples

With a newtype struct:

struct Value(u32);

impl_more::forward_lower_hex!(Value);

assert_eq!(
    format!("{:x}", Value(42)),
    "2a",
);

With a generic newtype struct:

struct Value<T>(T);

impl_more::forward_lower_hex!(<T> in Value<T>);

let inner = 42u32;

assert_eq!(
    format!("{:x}", Value(inner)),
    "2a",
);

Select a named field with => field:

struct Value {
    inner: u32,
}

impl_more::forward_lower_hex!(Value => inner);

let value = Value { inner: 42 };

assert_eq!(
    format!("{:x}", value),
    "2a",
);