windows-future 0.100.0

Windows async types
Documentation 
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## windows-future

The [windows-future](https://crates.io/crates/windows-future) crate adapts WinRT asynchronous
operations to Rust futures.

* [Getting
  started](https://github.com/microsoft/windows-rs/blob/master/docs/crates/windows-future.md)

Start by adding the following to your Cargo.toml file:

```toml
[dependencies.windows-future]
version = "0.100"
```

Use the Windows async types as needed:

```rust,no_run
use windows_future::*;

// This result will be available immediately.
let ready = IAsyncOperation::ready(Ok(123));
assert_eq!(ready.join().unwrap(), 123);

let ready = IAsyncOperation::spawn(|| {
    // Some lengthy operation goes here...
    Ok(456)
});

assert_eq!(ready.join().unwrap(), 456);
```