Rust mdo 
Presentation
Rust mdo is a monadic do notation using macros and duck typing. It
provides a syntax extension providing something that looks like the
Haskell do notation, and rewrites it using a bind function. Some
functions are provided for a number of common monadic structures.
Example
Add to your Cargo.toml:
[dependencies]
mdo = "*"#[macro_use] extern crate mdo;
fn main() {
// exporting the monadic functions for the Iterator monad (similar
// to list comprehension)
use mdo::iter::{bind, ret, mzero};
// getting the list of (x, y, z) such that
// - 1 <= x <= y < z < 11
// - x^2 + y^2 == z^2
let l = bind(1i32..11, move |z|
bind(1..z, move |x|
bind(x..z, move |y|
bind(if x * x + y * y == z * z { ret(()) }
else { mzero() },
move |_|
ret((x, y, z))
)))).collect::<Vec<_>>();
println!("{:?}", l);
// the same thing, using the mdo! macro
let l = mdo! {
z =<< 1i32..11;
x =<< 1..z;
y =<< x..z;
when x * x + y * y == z * z;
ret ret((x, y, z))
}.collect::<Vec<_>>();
println!("{:?}", l);
}Documentation
You can find the rustdoc here.
Supported monads
This library provides definitions for the following monads:
OptionIteratorResult(without error conversion)
Other implementations in external crates:
Futurein mdo-future
License
This work is free. You can redistribute it and/or modify it under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See the COPYING file for more details.