Macro frunk_core::HList
source · macro_rules! HList { () => { ... }; (...$Rest:ty) => { ... }; ($A:ty) => { ... }; ($A:ty, $($tok:tt)*) => { ... }; }
Expand description
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)];
// Use "...Tail" to append another HList type at the end.
let h: HList!(f32, ...HList!(&str, Option<i32>)) = hlist![13.5f32, "hello", Some(41)];
Run