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Related constants in Rust: 1 << iota

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1 &lt;&lt; iota
===============

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The `iota!` macro constructs a set of related constants.

```toml
[dependencies]
iota = "0.2"
```

```rust
use iota::iota;

iota! {
 const A: u8 = 1 << iota;
 , B
 , C
 , D
}

fn main() {
    assert_eq!(A, 1);
    assert_eq!(B, 2);
    assert_eq!(C, 4);
    assert_eq!(D, 8);
}
```

Within an `iota!` block, the `iota` variable is an untyped integer constant
whose value begins at 0 and increments by 1 for every constant declared in
the block.

```rust
use iota::iota;

iota! {
 const A: u8 = 1 << iota;
 , B

const C: i32 = -1; // iota is not used but still incremented

pub const D: u8 = iota * 2;
        , E
        , F
}

// `iota` begins again from 0 in this block
iota! {
 const G: usize = 1 << (iota + 10);
 , H
}

fn main() {
 assert_eq!(A, 1 << 0);
 assert_eq!(B, 1 << 1);

assert_eq!(C, -1);

assert_eq!(D, 3 * 2);
    assert_eq!(E, 4 * 2);
    assert_eq!(F, 5 * 2);

assert_eq!(G, 1 << (0 + 10));
 assert_eq!(H, 1 << (1 + 10));
}
```

#### License

Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.

iota

iota 최신버젼 다운로드

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