tub 0.3.3

Async Pool
Documentation 
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# Tub 🛁

[<img alt="github" src="https://img.shields.io/badge/github-wcygan/tub-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/wcygan/tub)
[<img alt="crates.io" src="https://img.shields.io/crates/v/tub.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/tub)
[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-tub-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/tub)
[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/wcygan/tub/test.yml?branch=master&style=for-the-badge" height="20">](https://github.com/wcygan/tub/actions?query=branch%3Amaster)


A *blazingly fast* object pool for Rust.

Values are retrieved from the pool asynchronously. When the retrieved value goes out of scope, the value is returned to the pool.

## Usage

To use Tub, add this to your Cargo.toml:

```toml
[dependencies]
tub = "0.3.3"
```

Then create and use a pool like so:

```rust
use tub::Pool;

#[tokio::main]
async fn main() {
   // Create a pool
   let pool = Pool::from_initializer(10, || Box { value: 123 });

   // Get a value from the pool
   let mut box1 = pool.acquire().await;

   // Use the value
   box1.foo();

   // Modify the value
   *box1 = Box { value: 456 };

   // Return the value to the pool
   drop(box1);
}

struct Box {
  value: u32
}

impl Box {
  fn foo(&mut self) { }
}
```