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@@ -1,3 +1,51 @@
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+//! Simple GlobalContainer based on std::sync::RwLock.
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+//!
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+//! This crate is AS IS.
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+//!
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+//! By ZRY.
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+//!
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+//! # Example:
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+//!
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+//! ```
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+//! use simple_rw_global::GlobalContainer;
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+//!
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+//! static GLOBAL : GlobalContainer<GlobalObject> = GlobalContainer::<GlobalObject>::new();
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+//!
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+//! pub struct GlobalObject {
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+//! log_prefix: String,
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+//! }
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+//!
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+//! impl GlobalObject {
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+//! pub fn new(prefix: &str) -> GlobalObject {
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+//! GlobalObject{log_prefix: String::from(prefix)}
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+//! }
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+//!
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+//! pub fn log(&self, msg: &str) {
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+//! println!("[{}] {}", self.log_prefix.as_str(), msg);
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+//! }
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+//!
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+//! pub fn change_prefix(&mut self, prefix: &str) {
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+//! self.log_prefix = String::from(prefix);
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+//! }
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+//! }
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+//!
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+//! fn main() {
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+//! println!("before init, is empty: {}", GLOBAL.is_empty());
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+//! GLOBAL.set(GlobalObject::new("log-test1"));
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+//! println!("after init, is empty: {}", GLOBAL.is_empty());
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+//! println!("init ok.");
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+//! GLOBAL.get().log("hello 1");
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+//! GLOBAL.get_mut().change_prefix("log-test2");
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+//! GLOBAL.get().log("hello 2");
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+//! GLOBAL.manual_drop();
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+//! println!("dropped manually. will panic then.");
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+//! GLOBAL.get().log("test after drop.");
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+//! }
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+//!
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+//! ```
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+//!
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+//!
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+
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use std::ops::{Deref, DerefMut};
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use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
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