# Solstack: The Book **Solstack** is a library that enables the management of an application's control flow through a **state stack machine**. A `Stack` `struct` holds any number of `State`s. When said `Stack` is ticked, it executes the main methods of the **topmost `State`**. This means that only the `State` at the top of the `Stack` is executed, while the ones below it are effectively **paused**. An exception are the `State`'s `on_shadow_tick` method introduced in `v0.3.0` which is always executed independently of the `State`'s position on the `Stack`. * You can read [The Book](https://solmateus.gitbook.io/solstack/). * Take a look at the examples on the [git repository](https://github.com/solmateus/solstack). * Search documentation at the [crate's docs](https://crates.io/crates/solstack). * Watch the project develop through its [changelog](https://github.com/solmateus/solstack/blob/main/CHANGELOG.md)! > *Project is in early development, things may change around! Take a look at the changelog before updating. Some text may imply that things are done, when they're not, like The Book. There may be bugs, though the tests should guarantee there aren't many.* ### Thanks > The documentation will always be up to date. Thank you for using `solstack`! *By Sol*