rust/example/std_example.rs

#![feature(core_intrinsics)]

use std::io::Write;

fn main() {
    let _ = ::std::iter::repeat('a' as u8).take(10).collect::<Vec<_>>();
    let stderr = ::std::io::stderr();
    let mut stderr = stderr.lock();

    writeln!(stderr, "some {} text", "<unknown>").unwrap();

    let _ = std::process::Command::new("true").env("c", "d").spawn();

    println!("cargo:rustc-link-lib=z");

    static ONCE: std::sync::Once = std::sync::ONCE_INIT;
    ONCE.call_once(|| {});

    LoopState::Continue(()) == LoopState::Break(());

    // Make sure ByValPair values with differently sized components are correctly passed
    map(None::<(u8, Box<Instruction>)>);

    println!("{}", 2.3f32.exp());
    println!("{}", 2.3f32.exp2());
    println!("{}", 2.3f32.abs());
    println!("{}", 2.3f32.sqrt());
    println!("{}", 2.3f32.floor());
    println!("{}", 2.3f32.ceil());
    println!("{}", 2.3f32.min(1.0));
    println!("{}", 2.3f32.max(1.0));
}

#[derive(PartialEq)]
enum LoopState {
    Continue(()),
    Break(())
}

pub enum Instruction {
    Increment,
    Loop,
}

fn map(a: Option<(u8, Box<Instruction>)>) -> Option<Box<Instruction>> {
    match a {
        None => None,
        Some((_, instr)) => Some(instr),
    }
}