Macro frunk::Hlist

macro_rules! Hlist {
    (  ) => { ... };
    ( $ single : ty ) => { ... };
    (
$ first : ty , $ ( $ repeated : ty ) , + ) => { ... };
    (
$ single : ty , ) => { ... };
    (
$ first : ty , $ ( $ repeated : ty , ) + ) => { ... };
}

Returns a type signature for an HList of the provided types

This is a type macro (introduced in Rust 1.13) that makes it easier to write nested type signatures.

Examples

let h: Hlist!(f32, &str, Option<i32>) = hlist![13.5f32, "hello", Some(41)];