hexga_map_on 0.0.11-beta.53

Define the map_on! macro that can be used to impl a lot of trait quickly using macros.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

use hexga_map_on::*;

trait Foo
{
    fn foo();
}

impl Foo for i32
{
    fn foo()
    {
        println!("foo from i32");
    }
}
impl Foo for bool
{
    fn foo()
    {
        println!("foo from bool");
    }
}

map_on_tuple!(
    (
        $(
            $len:literal => ( $( $idx:tt $typ:ident )+ )
        )*
    ) => {
        $(
            #[cfg_attr(docsrs, doc(fake_variadic))]
            impl<$( $typ: Foo ),+> Foo for ( $( $typ ),+ ,) {
                fn foo() {
                    println!("Foo from tuple size {}", $len);
                }
            }
        )*
    };
);

fn main()
{
    <i32>::foo();
    <bool>::foo();

    <(i32,)>::foo();
    <(i32, i32)>::foo();

    <(i32, bool)>::foo();
    <(i32, bool, i32)>::foo();
}