Rust basics

0000_notes.txt

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+
+# Building for example a lib such as "rust-syslog" - This needs exec privilege on the target partition.
+cargo build
+
+# Add external !built! crate
+rustc -L /home/extern/path asd.rs
+
+rustc asd.rs --extern /home/path/lib

000_println.rs

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+//https://doc.rust-lang.org/rust-by-example/hello/print.html
+
+fn main() {
+    // Comment
+    /* Multi line */
+    println!("Printed text.");
+    print!("No new line.");
+}

010_add_distract_math_literal_operator.rs

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+//https://doc.rust-lang.org/rust-by-example/primitives/literals.html
+
+fn main() {
+    println!("1 + 2 = {}", 1u32 + 2);
+    println!("1 + 2 = {}", 32 + 2);
+
+    println!("1 - 2 = {}", 1i32 - 2);
+    //println!("1 - 2 = {}", 1u32 - 2); // panic because of overflow
+
+    // Short-circuiting boolean logic
+    println!("true AND false is {}", true && false);
+    println!("true OR false is {}", true || false);
+    println!("NOT true is {}", !true);
+
+    // Bitwise operations
+    println!("0011 AND 0101 is {:04b}", 0b0011u32 & 0b0101);
+    println!("0011 OR 0101 is {:04b}", 0b0011u32 | 0b0101);
+    println!("0011 XOR 0101 is {:04b}", 0b0011u32 ^ 0b0101);
+    println!("1 << 5 is {}", 1u32 << 5);
+    println!("0x80 >> 2 is 0x{:x}", 0x80u32 >> 2);
+
+    // Use underscores to improve readability!
+    println!("One million is written as {}", 1_000_000u32);
+}

020_tuples.rs

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+// https://doc.rust-lang.org/rust-by-example/primitives/tuples.html
+
+// Tuples can be used as function arguments and as return values
+fn reverse(pair: (i32, bool)) -> (bool, i32) {
+    // `let` can be used to bind the members of a tuple to variables
+    let (integer, boolean) = pair;
+
+    (boolean, integer)
+}
+
+// The following struct is for the activity.
+#[derive(Debug)]
+struct Matrix(f32, f32, f32, f32);
+
+fn main() {
+
+    // ---------- //
+
+    // A tuple with a bunch of different types
+    let long_tuple = (1u8, 2u16, 3u32, 4u64,
+                      -1i8, -2i16, -3i32, -4i64,
+                      0.1f32, 0.2f64,
+                      'a', true);
+
+    // Values can be extracted from the tuple using tuple indexing
+    println!("long tuple first value: {}", long_tuple.0);
+    println!("long tuple second value: {}", long_tuple.1);
+
+    // ---------- //
+
+    // Tuples can be tuple members
+    let tuple_of_tuples = ((1u8, 2u16, 2u32), (4u64, -1i8), -2i16);
+
+    // Tuples are printable
+    println!("tuple of tuples: {:?}", tuple_of_tuples);
+    
+    // But long Tuples cannot be printed
+    // let too_long_tuple = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
+    // println!("too long tuple: {:?}", too_long_tuple);
+    // TODO ^ Uncomment the above 2 lines to see the compiler error
+
+    let pair = (1, true);
+    println!("pair is {:?}", pair);
+
+    println!("the reversed pair is {:?}", reverse(pair));
+
+    // To create one element tuples, the comma is required to tell them apart
+    // from a literal surrounded by parentheses
+    println!("one element tuple: {:?}", (5u32,));
+    println!("just an integer: {:?}", (5u32));
+
+    //tuples can be destructured to create bindings
+    let tuple = (1, "hello", 4.5, true);
+
+    let (a, b, c, d) = tuple;
+    println!("{:?}, {:?}, {:?}, {:?}", a, b, c, d);
+
+    let matrix = Matrix(1.1, 1.2, 2.1, 2.2);
+    println!("{:?}", matrix);
+
+}
+

021_tuples_simple.rs

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+fn main() {
+    let tuplex = ("first", "and", 3);
+    print!("The {} {}", tuplex.1, tuplex.2);
+}

100_tcp_listen_thread_answer.rs

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+use std::net::TcpListener;
+use std::thread;
+use std::io::Write;
+
+fn main() {
+    let listener = TcpListener::bind("127.0.0.1:8081").unwrap();
+
+    for stream in listener.incoming() {
+        thread::spawn(|| {
+            let mut stream = stream.unwrap();
+            stream.write(b"Hello, that's an answer.\r\n").unwrap();
+        });
+    }
+ }