example/std_example.rs

   1 #![feature(core_intrinsics)]
   2
   3 use std::io::Write;
   4 use std::intrinsics;
   5
   6 fn main() {
   7     let _ = ::std::iter::repeat('a' as u8).take(10).collect::<Vec<_>>();
   8     let stderr = ::std::io::stderr();
   9     let mut stderr = stderr.lock();
  10
  11     writeln!(stderr, "some {} text", "<unknown>").unwrap();
  12
  13     let _ = std::process::Command::new("true").env("c", "d").spawn();
  14
  15     println!("cargo:rustc-link-lib=z");
  16
  17     static ONCE: std::sync::Once = std::sync::ONCE_INIT;
  18     ONCE.call_once(|| {});
  19
  20     LoopState::Continue(()) == LoopState::Break(());
  21
  22     // Make sure ByValPair values with differently sized components are correctly passed
  23     map(None::<(u8, Box<Instruction>)>);
  24
  25     println!("{}", 2.3f32.exp());
  26     println!("{}", 2.3f32.exp2());
  27     println!("{}", 2.3f32.abs());
  28     println!("{}", 2.3f32.sqrt());
  29     println!("{}", 2.3f32.floor());
  30     println!("{}", 2.3f32.ceil());
  31     println!("{}", 2.3f32.min(1.0));
  32     println!("{}", 2.3f32.max(1.0));
  33     println!("{}", 2.3f32.powi(2));
  34
  35     assert_eq!(0b0000000000000000000000000010000010000000000000000000000000000000_0000000000100000000000000000000000001000000000000100000000000000u128.leading_zeros(), 26);
  36     assert_eq!(0b0000000000000000000000000010000000000000000000000000000000000000_0000000000000000000000000000000000001000000000000000000010000000u128.trailing_zeros(), 7);
  37
  38     0i128.checked_div(2i128);
  39     0u128.checked_div(2u128);
  40     assert_eq!(1u128 + 2, 3);
  41
  42     assert_eq!(0b100010000000000000000000000000000u128 >> 10, 0b10001000000000000000000u128);
  43     assert_eq!(0xFEDCBA987654321123456789ABCDEFu128 >> 64, 0xFEDCBA98765432u128);
  44     assert_eq!(0xFEDCBA987654321123456789ABCDEFu128 as i128 >> 64, 0xFEDCBA98765432i128);
  45     assert_eq!(353985398u128 * 932490u128, 330087843781020u128);
  46 }
  47
  48 #[derive(PartialEq)]
  49 enum LoopState {
  50     Continue(()),
  51     Break(())
  52 }
  53
  54 pub enum Instruction {
  55     Increment,
  56     Loop,
  57 }
  58
  59 fn map(a: Option<(u8, Box<Instruction>)>) -> Option<Box<Instruction>> {
  60     match a {
  61         None => None,
  62         Some((_, instr)) => Some(instr),
  63     }
  64 }