Future Trait

Async/await foundations

Future Basics

use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};

fn main() {
    // Future trait definition (simplified):
    // trait Future {
    //     type Output;
    //     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>;
    // }

    println!("=== Future Trait ===");
    println!("Future is Rust's abstraction for async computation");
    println!();
    println!("Key concepts:");
    println!("- Output: The value produced when complete");
    println!("- poll(): Check if ready, or register waker");
    println!("- Pin: Prevents moving to ensure safety");
    println!("- Waker: Notifies executor when ready");

    println!("\n=== Poll Enum ===");
    println!("Poll::Ready(value) - Future is complete");
    println!("Poll::Pending - Not ready, will wake when ready");
}