//! A libray for weighted balancing algorithm.
//! It provides three weighted balancing (elect) algorithm.
//! One is random algorithm.
//! Another is weighted balancing algorithm used by LVS.
//! The third is smooth weighted balancing algorithm used by Nginx.
//!
//! The LVS weighted round-robin scheduling is introduced at http://kb.linuxvirtualserver.org/wiki/Weighted_Round-Robin_Scheduling.
//! The Nginx smooth weighted round-robin balancing algorithm is introduced at https://github.com/phusion/nginx/commit/27e94984486058d73157038f7950a0a36ecc6e35.
//! The random algorithm is not smooth although it follows weight configuration.
//! Using it is simple:
//! ```rust
//! use weighted_rs::{SmoothWeight, Weight};
//! use std::collections::HashMap;
//!
//! let mut sw: SmoothWeight<&str> = SmoothWeight::new();
//! sw.add("server1", 5);
//! sw.add("server2", 2);
//! sw.add("server3", 3);
//!
//! for _ in 0..100 {
//! let s = sw.next().unwrap();
//! println!("{}", s);
//! }
//! ```
use HashMap;
pub use *;
pub use *;
// A common trait for weight algorithm.