any_vec 0.3.0

Type erased vector. Most operations can be done without type knowledge. Mostly zero overhead.
Documentation 
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[![crates.io](https://img.shields.io/crates/v/any_vec.svg)](https://crates.io/crates/any_vec)
[![license](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue?style=flat-square)](#license)
[![Docs](https://docs.rs/any_vec/badge.svg)](https://docs.rs/any_vec)
[![CI](https://github.com/tower120/any_vec/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/tower120/any_vec/actions/workflows/ci.yml)

Type erased vector. All elements have the same type.

Designed to be type-erased as far as possible - most of the operations does not know about concrete type.

Only destruct operations have additional overhead of indirect call.

# Usage


```rust
    let mut vec: AnyVec = AnyVec::new::<String>();
    {
        // Typed operations.
        let mut vec = vec.downcast_mut::<String>().unwrap();
        vec.push(String::from("0"));
        vec.push(String::from("1"));
        vec.push(String::from("2"));
    }
 
    let mut other_vec: AnyVec = AnyVec::new::<String>();
    // Fully type erased element move from one vec to another
    // without intermediate mem-copies.
    //
    // Equivalent to:
    //
    // let element = vec.swap_remove(0);
    // other.push(element);
    unsafe{
        let element: &mut[u8] = other_vec.push_uninit();    // allocate element 
        vec.swap_remove_into(0, element);                   // swap_remove
    }

    // Output 2 1
    for s in vec.downcast_ref::<String>().unwrap().as_slice(){
        println!("{}", s);
    }
    
```

# Known alternatives


* [type_erased_vec](https://crates.io/crates/type_erased_vec). Allow to store `Vec<T>` in type erased way, 
but you need to perform operations, you need to "cast" to concrete type first.
* [untyped_vec](https://crates.io/crates/untyped_vec). Some operations like `len`, `capacity` performed without type
knowledge; but the rest - require concrete type.