tupleops/
tpl_append.rs

1crate::do_impl!("append", tuple_append, {
2    /// The resulting type when an element is appended to an initial tuple.
3    ///
4    /// ```
5    /// use same_types::assert_same_types;
6    /// use tupleops::Append;
7    ///
8    /// assert_same_types!(
9    ///     Append<(u8, u16), u32>,
10    ///     (u8, u16, u32),
11    /// );
12    /// ```
13    ///
14    /// See also: [append()], [TupleAppend].
15    #[cfg_attr(docsrs, doc(cfg(feature = "append")))]
16    pub type Append<Init, Last> = <(Init, Last) as TupleAppend<Init, Last>>::Type;
17
18    /// Append an element to a tuple.
19    ///
20    /// ```
21    /// use tupleops::append;
22    ///
23    /// assert_eq!(
24    ///     append((1, 2, 3), 4),
25    ///     (1, 2, 3, 4),
26    /// );
27    /// ```
28    ///
29    /// See also: [Append], [TupleAppend].
30    #[cfg_attr(docsrs, doc(cfg(feature = "append")))]
31    #[inline(always)]
32    pub fn append<Init, Last>(init: Init, last: Last) -> Append<Init, Last>
33    where
34        (Init, Last): TupleAppend<Init, Last>,
35    {
36        <(Init, Last) as TupleAppend<Init, Last>>::append(init, last)
37    }
38
39    /// A tuple and an element that are usable with [append()].
40    ///
41    /// See also: [append()], [TupleAppend].
42    #[cfg_attr(docsrs, doc(cfg(feature = "append")))]
43    pub trait TupleAppend<Init, Last> {
44        #[doc(hidden)]
45        type Type;
46
47        #[doc(hidden)]
48        fn append(init: Init, last: Last) -> Self::Type;
49    }
50
51    impl<Last> TupleAppend<(), Last> for ((), Last) {
52        type Type = (Last,);
53
54        #[inline(always)]
55        fn append(init: (), last: Last) -> Self::Type {
56            let () = init;
57            (last,)
58        }
59    }
60});
tupleops/tpl_append.rs

tupleops/
tpl_append.rs
