be more explicit about dereferencing

[rust-101.git] / src / main.rs

diff --git a/src/main.rs b/src/main.rs
index a0dc866ee3103edd3e19577707b8e9bd5318b2d2..68578fdb59987d60344f8b5d138eab1a7f5cad2a 100644 (file)
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,31 +1,102 @@
-#![allow(dead_code)]

 // Welcome to Rust-101
 // ===================
 // Welcome to Rust-101
 // ===================

-//
-// This is Rust-101, a small tutorial to the [Rust language](http://www.rust-lang.org/).
-// This is intended to be an interactive, hands-on course: I believe the only way to
+// 
+// This is [Rust-101](https://www.ralfj.de/projects/rust-101/), a small *work-in-progress*
+// tutorial for the [Rust language](http://www.rust-lang.org/).
+// It is intended to be an interactive, hands-on course: I believe the only way to

 // *really* learn a language is to write code in it, so you should be coding during
 // *really* learn a language is to write code in it, so you should be coding during

-// the course. These documents mainly serve as a guide to the teacher, reminding me
-// what to explain in which order, and making sure I have sample code for all topics
-// I plan to cover. They may also be helpful as an offline resource, but you're on your
-// own then.
-
-// I will assume basic familiarity with programming, and hence not explain the basic
+// the course.
+// 
+// If you have any questions that are not answered here, check out the "Additional Resources"
+// below. In particular, the IRC channel is filled with awesome people willing to help you! I spent
+// lots of time there ;-)
+// 
+// I will assume some familiarity with programming, and hence not explain the basic

 // concepts common to most languages. Instead, I will focus on what makes Rust special.
 // concepts common to most languages. Instead, I will focus on what makes Rust special.

+//
+// Why Rust?
+// ---------
+// 
+// When you got here, I am kind of assuming that you already decided to give Rust at
+// least a look, so that I don't have to do much convincing here ;-) . But just in
+// case, here's why I think Rust is worth learning:<br/>
+// At this time, Rust is a language with a pretty unique set of goals. Rust aims to
+// achieve C++-style control over memory and execution behavior (like, static vs. dynamic
+// dispatch), which makes it possible to construct abstractions that carry no run-time
+// cost. This is combined with the comfort of high-level functional languages and guaranteed
+// safety (as in, the program will not crash). The vast majority of existing
+// languages sacrifices one of these goals for the other. In particular, the
+// first requirement rules out a garbage collector: Rust can run "bare metal".
+// In fact, Rust rules out more classes of bugs than languages that achieve safety
+// with a GC: Besides dangling pointers and double-free, Rust also prevents issues
+// such as iterator invalidation and race conditions.
+// 
+// 
+// Getting started
+// ---------------
+// 
+// You will need to have Rust installed, of course. It is available for download on
+// [the Rust website](http://www.rust-lang.org/). You should go for either the "stable"
+// or the "beta" channel. More detailed installation instructions are provided in
+// [the second chapter of The Book](https://doc.rust-lang.org/stable/book/installing-rust.html).
+// This will also install `cargo`, the tool responsible for building rust projects (or *crates*).

 
 

-// The actual course is in the partXX.rs files. I suggest you get started with
-// [the first part](part00.html), or jump directly to where you left off:
+// Next, fetch the Rust-101 source code from the [git repository](http://www.ralfj.de/git/rust-101.git)
+// (also available [on GitHub](https://github.com/RalfJung/rust-101), and as a
+// [zip archive](https://github.com/RalfJung/rust-101/archive/master.zip) in case you don't have git installed).
+// 
+// There is a workspace prepared for you in the `workspace` folder. I suggest you copy this
+// folder somewhere else - that will make it much easier to later update the course without
+// overwriting your changes. Try `cargo build` in that new folder to check that compiling your workspace succeeds.
+// (You can also execute it with `cargo run`, but you'll need to do some work before this will succeed.)
+// 
+// If you later want to update the course, do `git pull` (or re-download the zip archive).
+// Then copy the files from `workspace/src/` to your workspace that you did not yet work on. Definitely
+// copy `main.rs` to make sure all the new files are actually compiled. (Of course you can also
+// copy the rest, but that would replace all your hard work by the original files with all the holes!)

 
 

-// * [Part 00](part00.html)
-// * [Part 01](part01.html)
+// Course Content
+// --------------
+// 
+// The part 00-03 cover some basic of the language, to give you a feeling for Rust's syntax and pervasive
+// mechanisms like pattern matching and traits. Parts 04-06 introduce the heart of the language, the ideas
+// making it different from anything else out there: Ownership, borrowing, lifetimes. In part 07-??, we
+// continue our tour through Rust with another example. Finally, in parts ??-??, we implement our own
+// version of `grep`, exhibiting some more Rust features as we go.
+// 
+// Now, open `your-workspace/src/part00.rs` in your favorite editor, and follow the link below for
+// the explanations and exercises. Have fun!
+// 
+// * [Part 00: Algebraic datatypes](part00.html)
+// * [Part 01: Expressions, Inherent methods](part01.html)
+// * [Part 02: Generic types, Traits](part02.html)
+// * [Part 03: Input](part03.html)
+// * [Part 04: Ownership, Borrowing](part04.html)
+// * [Part 05: Clone](part05.html)
+// * [Part 06: Copy, Lifetimes](part06.html)
+// * [Part 07: Operator Overloading, Tests, Formating](part07.html)
+// * [Part 08: Associated Types, Modules](part08.html)
+// * [Part 09: Iterators](part09.html)
+// * [Part 10: Closures](part10.html)
+// * (to be continued)
+#![allow(dead_code, unused_imports, unused_variables, unused_mut)]

 mod part00;
 mod part01;
 mod part00;
 mod part01;

+mod part02;
+mod part03;
+mod part04;
+mod part05;
+mod part06;
+mod part07;
+mod part08;
+mod part09;
+mod part10;

 
 

-// To actually run the code after filling in the blanks, simply edit the `main`
-// function below.
+// To actually run the code of some part (after filling in the blanks, if necessary), simply edit the `main`
+// function.

 
 fn main() {
 
 fn main() {

-    part00::part_main();
+    part00::main();

 }
 
 // Additional material
 }
 
 // Additional material


@@ -33,6 +104,8 @@ fn main() {
 // 
 // There's tons of useful Rust stuff out there, so let me just put links to some
 // of the most interesting places here:
 // 
 // There's tons of useful Rust stuff out there, so let me just put links to some
 // of the most interesting places here:

+// 

 // * [The Rust Book](https://doc.rust-lang.org/stable/book/)
 // * [Rust by Example](http://rustbyexample.com/)
 // * The [Rust Subreddit](https://www.reddit.com/r/rust/)
 // * [The Rust Book](https://doc.rust-lang.org/stable/book/)
 // * [Rust by Example](http://rustbyexample.com/)
 // * The [Rust Subreddit](https://www.reddit.com/r/rust/)

+// * For the IRC channel and other forums, see the "Community" section of the [Rust Documentation index](http://doc.rust-lang.org/index.html)