Function tupleops::map_tuple

pub fn map_tuple<Mapper: TupleMapper, Tpl>(
    mapper: Mapper, 
    tpl: Tpl
) -> MapTuple<Mapper, Tpl> where
    (Mapper, Tpl): TupleMap<Mapper, Tpl>, 

This is supported on crate feature map only.

Element-wise map a tuple with a mapper.

#![feature(generic_associated_types)]

use tupleops::{TupleMapper, map_tuple};

struct MyTupleEnum(usize);

impl TupleMapper for MyTupleEnum {
    type MapElem<Type> = (usize, Type);

    fn map_elem<Elem>(&mut self, elem: Elem) -> Self::MapElem<Elem> {
        let index = self.0;
        self.0 += 1;
        (index, elem)
    }
}

assert_eq!(
    map_tuple(MyTupleEnum(1), ("hello", "world", "!")),
    ((1, "hello"), (2, "world"), (3, "!")),
)

See also: MapTuple, TupleMapper, TupleMap.