Attribute Macro masala::curry

#[curry]

Curry is a proc_macro. It takes a Rust function written like:

#![feature(type_alias_impl_trait, min_type_alias_impl_trait)]
use masala::curry;

#[curry]
fn add(a: isize, b:isize) -> isize {
    a + b
}

fn main() {
    let add_10 = add(10);
    let x = 23;
    println!("Ten plus {} is {}", x, add_10(x));
}

This macro supports generics, to an extent. For example this is valid:

#![feature(type_alias_impl_trait, min_type_alias_impl_trait)]
use std::ops::Add;
use masala::curry;

#[curry]
fn add<T: Add + Add<Output = T> + Clone>(a: T, b:T) -> T {
    a.clone() + b
}

The macro does expect that a function returns something. A function with no return will not compile. To take another function as a parameter follow this pattern:

#![feature(type_alias_impl_trait, min_type_alias_impl_trait)]
use masala::curry;

#[curry]
fn psi<T: Clone>(a: fn(T, T) -> T, b: fn(T) -> T, c: T, d: T) -> T {
    a(b(c.clone()), b(d))
}