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Commit 68cce7c

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'review1'
1 parent 619c8d3 commit 68cce7c

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4 files changed

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4 files changed

+200
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‎examples/enums.rs

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#[derive(Debug, PartialEq, PartialOrd)]
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enum Direction {
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Up,
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Down,
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Left,
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Right
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}
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use Direction::*;
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impl Direction {
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fn as_str(&self) -> &'static str {
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match self {
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Up => "up",
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Right => "right",
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Down => "down",
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Left => "left"
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}
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}
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fn next(&self) -> Self {
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match *self {
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Up => Right,
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Right => Down,
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Down => Left,
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Left => Up
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}
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}
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}
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#[derive(Debug)]
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enum ValueEnum {
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Number(f64),
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Str(String),
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Bool(bool)
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}
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use ValueEnum::*;
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impl<'a> ValueEnum {
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fn to_str(&'a self) -> Option<&'a String> {
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match self {
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Str(s) => Some(s),
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_ => None
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}
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}
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fn to_str1(&self) -> Option<&String> {
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if let Str(s) = self {
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Some(s)
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} else {
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None
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}
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}
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}
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fn eat_and_dump(x: ValueEnum) {
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use ValueEnum::*;
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match x {
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Number(n) => println!("number is {}", n),
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Str(s) => println!("string is {}", s),
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Bool(b) => println!("bool is {}", b)
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}
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}
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fn dump(x: &ValueEnum) {
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match *x {
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Number(n) => println!("number is {}", n),
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Str(ref s) => println!("string is {}", s),
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Bool(b) => println!("bool is {}", b)
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}
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}
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fn main() {
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let mut x = Direction::Left;
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assert_eq!(x, Direction::Left);
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println!("x as str is {}", x.as_str());
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for _ in 0..8 {
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println!("x {:?} value is {}", x.next(), x.next() as u32);
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if x.next() > Direction::Left {
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println!("bigger than Left");
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}
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x = x.next();
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}
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use ValueEnum::*;
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let n = ValueEnum::Number(2.4);
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let s = Str("hello".to_string());
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let b = Bool(true);
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println!("{:?} {:?} {:?}", n, s, b);
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println!("{:?} {:?} {:?}", n, s, b);
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dump(&n);
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dump(&s);
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dump(&b);
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println!("s? {:?}", s.to_str());
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if n.to_str1() == None {
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println!("to str is None");
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} else {
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println!("s {:?}", n.to_str1());
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}
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eat_and_dump(n);
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eat_and_dump(s);
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eat_and_dump(b);
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}

‎examples/iterator.rs

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struct FRange {
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val: f64,
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end: f64,
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incr: f64
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}
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fn range(x1: f64, x2: f64, skip: f64) -> FRange {
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FRange {val: x1, end: x2, incr: skip}
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}
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impl Iterator for FRange {
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type Item = f64;
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fn next(&mut self) -> Option<Self::Item> {
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let res = self.val;
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if res > self.end {
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None
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} else {
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self.val += self.incr;
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Some(res)
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}
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}
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}
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fn dump<T> (value: &T)
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where T: std::fmt::Debug {
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println!("value is {:?}", value);
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}
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fn sqr<T> (x: T) -> T::Output
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where T: std::ops::Mul + Copy {
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x * x
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}
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#[derive(Debug)]
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struct Foo {
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name: String
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}
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fn main() {
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for x in range(0.0, 1.0, 0.1) {
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println!("{:1.1}", x);
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}
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let v: Vec<f64> = range(0.0, 1.0, 0.1).map(|x| x.sin()).collect();
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println!("v is {:?}", v);
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let x = 10;
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dump(&x);
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let y = 10.0345;
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dump(&y);
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let foo = Foo { name: "hello".to_string() };
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dump(&foo);
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println!("{}", sqr(10));
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}

‎examples/matching.rs

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struct Point {
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x: f32,
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y: f32
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}
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fn match_tuple(t: (i32, String)) {
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let x = match t {
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(0, s) => format!("zero {}", s),
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(1, s) if s == "hello" => format!("hello one"),
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no_match => format!("No match {:?}", no_match)
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};
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println!("{}", x);
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}
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fn main() {
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let t = (10, "hello".to_string());
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let (ref n, ref s) = t;
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println!("n is {}", n);
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println!("s is {}", s);
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let p = Point { x: 1.0, y: 2.0 };
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let Point {x, y} = p;
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println!("{} {}", x, y);
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match_tuple((1, "wasdf".to_string()));
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let ot = Some((2, "hello".to_string()));
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if let Some((_, ref s)) = ot {
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println!("{}", s);
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}
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}

‎mykey.json

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[193,198,108,170,127,209,205,155,63,80,24,196,198,17,201,48,56,136,7,52,92,229,249,144,107,101,49,137,74,98,169,206,140,46,88,67,190,69,160,182,122,26,126,196,32,251,145,234,197,180,129,183,51,88,184,4,74,153,10,103,247,61,154,136]

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