https://github.com/quark-zju/stateful_macro_rules

Rust `macro_rules!` with states
https://github.com/quark-zju/stateful_macro_rules

macros rust

Last synced: 2 months ago
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Rust `macro_rules!` with states

• Host: GitHub
• URL: https://github.com/quark-zju/stateful_macro_rules
• Owner: quark-zju
• License: mit
• Created: 2021-01-17T01:20:16.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2021-01-17T04:32:30.000Z (over 4 years ago)
• Last Synced: 2025-03-01T23:28:00.010Z (3 months ago)
• Topics: macros, rust
• Language: Rust
• Homepage:
• Size: 17.6 KB
• Stars: 1
• Watchers: 5
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# stateful_macro_rules

[![Documentation](https://docs.rs/stateful_macro_rules/badge.svg)](https://docs.rs/stateful_macro_rules)

![build](https://github.com/quark-zju/stateful_macro_rules/workflows/build/badge.svg)

Rust `macro_rules!` with states.

## Example

Define a stateful macro:

```rust

stateful_macro_rules! {

    /// Auto-incremental i32 constants from 0.

    constants(

        next: ($next:expr) = (0),

        body: ($($body:tt)*),

    ) {

        $($body)*

    };

    ($i:ident = $v:expr, ...) => {

        body.append(const $i: i32 = $v;);

        next.set($v + 1);

    };

    ($i:ident, ...) => {

        body.append(const $i: i32 = $next;);

        next.set($next + 1);

    };

}

```

Use the macro:

```rust

constants! { A, B, C, D = 10, E, F, }

assert_eq!(A, 0);

assert_eq!(C, 2);

assert_eq!(F, 12);

```

Refer to [the documentation](https://docs.rs/stateful_macro_rules) and [macro_examples.rs](test_examples/macro_examples/macro_examples.rs) for more examples.