iter-trait 0.3.1

Iter trait for collectons.
Documentation 
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macro_rules! do_impl {
    (
        MapIter for $name:ident, $impl_for:ty,
        ($key:ty, $key_item:ty, $keys_iter:ty),
        ($value:ty, $value_item:ty, $values_iter:ty); $($gen:tt)*
    ) => {
        impl<'a, $($gen)*> $crate::map::HasMapData for $impl_for {
            type Key = $key;
            type Value = $value;
        }
        impl<'a, $($gen)*> $crate::map::MapIter<'a> for $impl_for {
            type KeyRef = $key_item;
            type ValueRef = $value_item;
            type IterKeysRef = $keys_iter;
            type IterValuesRef = $values_iter;
            fn keys(&'a self) -> $keys_iter {
                $name::keys(self)
            }
            fn values(&'a self) -> $values_iter {
                $name::values(self)
            }
        }
    };
    (
        MapIterMut for $name:ident, $impl_for:ty,
        ($key:ty, $key_item:ty, $keys_iter:ty),
        ($value:ty, $value_item:ty, $values_iter:ty),
        ($value_item_mut:ty, $values_mut_iter:ty); $($gen:tt)*
    ) => {
        do_impl!(MapIter for $name, $impl_for,
                 ($key, $key_item, $keys_iter),
                 ($value, $value_item, $values_iter); $($gen)*);
        impl<'a, $($gen)*> $crate::map::MapIterMut<'a> for $impl_for {
            type ValueMut = $value_item_mut;
            type IterValuesMut = $values_mut_iter;

            fn values_mut(&'a mut self) -> $values_mut_iter {
                $name::values_mut(self)
            }
        }
    };
}

impl<T> super::HasData for [T] {
    type Item = T;
}
impl<T> super::HasMapData for [T] {
    type Key = usize;
    type Value = T;
}

cfg_if! {
    if #[cfg(feature = "alloc")] {
        cfg_if! {
            if #[cfg(feature = "std")] {
                use std::collections;
            } else {
                use alloc::{self as collections, Vec};
            }
        }
        use self::collections::{BTreeMap, BTreeSet, VecDeque, btree_map};

        impl<T: Ord> super::HasMapData for BTreeSet<T> {
            type Key = T;
            type Value = T;
        }
        impl<T> super::HasMapData for Vec<T> {
            type Key = usize;
            type Value = T;
        }
        impl<T> super::HasMapData for VecDeque<T> {
            type Key = usize;
            type Value = T;
        }

        do_impl!(MapIterMut for BTreeMap, BTreeMap<K, V>,
                (K, &'a K, btree_map::Keys<'a, K, V>),
                (V, &'a V, btree_map::Values<'a, K, V>),
                (&'a mut V, btree_map::ValuesMut<'a, K, V>); K: 'a + Ord, V: 'a);
    }
}

cfg_if! {
    if #[cfg(feature = "std")] {
        use std::collections::{HashMap, HashSet, hash_map};
        use std::hash::Hash;

        impl<T: Hash + Eq> super::HasMapData for HashSet<T> {
            type Key = T;
            type Value = T;
        }

        do_impl!(MapIterMut for HashMap, HashMap<K, V>,
                (K, &'a K, hash_map::Keys<'a, K, V>),
                (V, &'a V, hash_map::Values<'a, K, V>),
                (&'a mut V, hash_map::ValuesMut<'a, K, V>); K: 'a + Hash + Eq, V: 'a);
    }
}