coroutine 0.1.6

Coroutine Library in Rust
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// a copy of the std's thunk module
extern crate core;
extern crate alloc;

use self::alloc::boxed::Box;
use self::core::marker::Send;
use self::core::ops::FnOnce;

pub struct Thunk<'a, A=(),R=()> {
    invoke: Box<Invoke<A,R>+Send + 'a>,
}

impl<'a, R> Thunk<'a,(),R> {
    pub fn new<F>(func: F) -> Thunk<'a,(),R> where F : FnOnce() -> R, F : Send + 'a {
        Thunk::with_arg(move|()| func())
    }
}

impl<'a,A,R> Thunk<'a,A,R> {
    pub fn with_arg<F>(func: F) -> Thunk<'a,A,R> where F : FnOnce(A) -> R, F : Send + 'a {
        Thunk {
            invoke: Box::new(func)
        }
    }

    pub fn invoke(self, arg: A) -> R {
        self.invoke.invoke(arg)
    }
}

pub trait Invoke<A=(),R=()> {
    fn invoke(self: Box<Self>, arg: A) -> R;
}

impl<A,R,F> Invoke<A,R> for F where F : FnOnce(A) -> R {
    fn invoke(self: Box<F>, arg: A) -> R {
        let f = *self;
        f(arg)
    }
}