Lib.rs

This project is no longer maintained.

lib.rs:

A match-like macro that uses PartialEq to "match" each "patten".

Crate feature

• no-core: Make this crate #![no_core].

  #![no_core] example

  #![feature(no_core, lang_items, start)] #![no_core]

  #[cfg_attr(not(windows), link(name = "c"))] #[cfg_attr(windows, link(name = "msvcrt"))] extern "C" {}

  use match_eq::prelude::*;

  #[lang = "sized"] trait Sized {}

  #[lang = "copy"] trait Copy {}

  impl Copy for i32 {}

  #[lang = "receiver"] trait Receiver {}

  impl<T: ?Sized> Receiver for &T {}

  #[lang = "eh_personality"] fn eh_personality() -> ! { loop {} }

  #[lang = "eq"] trait CustomPartialEq { fn eq(&self, _: &T) -> bool; }

  impl CustomPartialEq for i32 { fn eq(&self, _: &i32) -> bool { loop {} } }

  #[start] fn main(_: isize, _: *const *const u8) -> isize { match_eq!(1 => { 1, 2 => if matches_eq!(3, 3, 4) { if matches_eq!(5, 6, 7) { 1 } else { 0 } } else { 1 }, _ => 1, }) }

  </details>
  
  

Example

use std::ffi::{OsStr, OsString};

assert_eq!(
    match_eq!(OsString::from("🎉") => {
        "🎃" => 0,
        "🚀", "🎉" => -1,
        s = OsStr::new("🎉") => {
            drop::<OsString>(s);
            -2
        }
        ref s = "🎉", OsStr::new("🚀") => {
            let _: &OsString = s;
            -3
        }
        _ = "🎉" => unreachable!(),
        _ => -5,
    }),
    -1
);