turnip-rs

Ternary operators (turnips) for Rust.

Rather than creating a functional procedural macro to parse yet-another domain-specific syntax, I opt for the simplest possible solution. The chosen approach provides recursion without additional function calls and does not extend the Rust syntax, which does not support the ? and : operators for this use case.

The solution is a single 16-line macro defined using macro_rules!. See for yourself. Unlike other solutions out there, such as terny, tern, iffy and ternop, this one provides recursion without additional top-level function calls, more closely matching the ternary operator design pattern.

What more do you need?

Installation

$ cargo add turnip

Usage

use turnip::ifelse;

fn main() {

    result1: bool = ifelse!(10 < 0, true, false);
    result2: bool = ifelse!(10 < 0, true, 10 == 0, true, false);
    assert!(result1 == result2);

}

License

MIT License