use std::marker::PhantomData;

use crate::runtime::Runtime;

use crate::window::{RuntimeWindow, Window, WindowCreator};

/// A trait that describes the application's behavior.

pub trait Application: Sized + Send + Sync {

    /// Executed upon application launch.

    /// Return true if the app should exit. Default implementation returns true

    /// once [`Application::open_window_count()`] returns zero.

    /// Returns the number of open windows.

    #[must_use]

}

/// An [`Application`] implementation that begins with a single window.

///

/// If feature `multiwindow` is enabled, multiple windows can still be opened.

/// This structure just provides a way to run an app without explicitly

/// implementing [`Application`] on one of your types.

pub struct SingleWindowApplication<T> {

    phantom: PhantomData<T>,

}

impl<T> Application for SingleWindowApplication<T> where T: Window + WindowCreator + 'static {}

impl<T> SingleWindowApplication<T>

where

    T: Window + WindowCreator + 'static,

{

    /// Runs the app. Does not return.

    }

}