Trait Len 

pub trait Len: HList {
    const LEN: usize;
}

Heterogenous list with length (count of elements) known at compile-time.

Required Associated Constants

const LEN: usize

Length (count of elements) of the heterogenous list.

Examples

use hlist2::{HList, Len};

assert_eq!(<HList![]>::LEN, 0);
assert_eq!(<HList![i32]>::LEN, 1);
assert_eq!(<HList![i32, f64, bool, &str]>::LEN, 4);

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl Len for Nil

const LEN: usize = 0usize

impl<Head, Tail> Len for Cons<Head, Tail>

where Tail: Len,

const LEN: usize