3 releases
0.1.2 | Aug 13, 2020 |
---|---|
0.1.1 | Aug 13, 2020 |
0.1.0 | Aug 13, 2020 |
#2895 in Rust patterns
5KB
tuple-arity
A simple crate for getting the arity (number of elements) of tuple types with 0 to 12 elements.
How to use
You can use the tuple_arity()
function to get the arity of an existing tuple value.
use tuple_arity::*;
assert_eq!(0, tuple_arity(&()));
assert_eq!(1, tuple_arity(&("foo",)));
assert_eq!(2, tuple_arity(&("foo", "bar")));
assert_eq!(3, tuple_arity(&("foo", "bar", "baz")));
You can also use the Arity
trait to get the arity of a tuple type directly:
use tuple_arity::Arity;
assert_eq!(0, <()>::arity());
assert_eq!(1, <(u8,)>::arity());
assert_eq!(2, <(u8, u8)>::arity());
assert_eq!(3, <(u8, u8, u8)>::arity());
assert_eq!(4, <(u8, u8, u8, u8)>::arity());