Trait SingletonTuple 

pub trait SingletonTuple: TupleLen<Len = U1> { }

A marker trait for single-element tuples (size 1).

This trait is implemented for single-element tuples (T,) and can be used for type-level programming to identify single-element tuples.

Examples

use tuplities_len::{SingletonTuple, TupleLen};
use typenum::U1;

fn is_single<T: SingletonTuple>(_tuple: T) {
    // This function only accepts single-element tuples
}

is_single((42,)); // This works
// is_single((1, 2)); // This would not compile
// is_single(()); // This would not compile

Part of the tuplities crate.

Implementations on Foreign Types

impl<T> SingletonTuple for (T,)

Implementors