be more explicit about dereferencing

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

diff --git a/src/main.rs b/src/main.rs
index 06ad4b216b985ca2ba09d646008560159f58885c..68578fdb59987d60344f8b5d138eab1a7f5cad2a 100644 (file)
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,14 +5,10 @@
 // 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
 // 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

-// the course. I am writing this with a tutorial situation in mind, i.e.,
-// with a teacher being around to guide students through the course and answer
-// questions as they come up. However, I think they may also be useful if you
-// work through them on your own, you will just have to show more initiative yourself:
-// Make sure you actually type some code. It may sound stupid to manually copy code
-// that you could duplicate through the clipboard, but it's actually helpful.
-// If you have questions, check out the "Additional Resources" below. In particular,
-// the IRC channel is filled with awesome people willing to help you! I spent
+// 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
 // lots of time there ;-)
 // 
 // I will assume some familiarity with programming, and hence not explain the basic


@@ -27,50 +23,63 @@
 // 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
 // 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 this with providing the comfort of high-level functional languages
-// and guaranteeing safety (as in, the program will not crash). The vast majority of existing
-// languages sacrificies one of these goals for the other. In particular, the
-// first requirement rules out a garbage collector: Rust can run "mare metal".
+// 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.
 // 
 // 
 // 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.
 // 
 // 

-// Prerequisites
-// -------------
+// Getting started
+// ---------------

 // 
 // You will need to have Rust installed, of course. It is available for download on
 // 
 // You will need to have Rust installed, of course. It is available for download on

-// [the Rust website](http://www.rust-lang.org/). At this point, I plan to restrict
-// myself to stable Rust, so "Recommended" version is just right.
-// You can find some more installation instructions in
+// [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).
 // [the second chapter of The Book](https://doc.rust-lang.org/stable/book/installing-rust.html).

-// When you are done, running `cargo build` in the root of Rust-101 should successfully compile
-// all the code.
+// This will also install `cargo`, the tool responsible for building rust projects (or *crates*).
+
+// 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).

 // 
 // 

-// Getting the source
-// ------------------
+// 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.)

 // 
 // 

-// You are meant to play around with the source code of the course as you go on, so please
-// fetch it from the [git repository](http://www.ralfj.de/git/rust-101.git) (also available
-// [on GitHub](https://github.com/RalfJung/rust-101)).
+// 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!)

 
 // Course Content
 // --------------
 // 
 
 // Course Content
 // --------------
 // 

-// The actual course is in the partXX.rs files. 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-?? introduce the heart of the language, the mechanism making it different from anything
-// else out there.
+// 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.

 // 
 // 

-// I suggest you get started with [the first part](part00.html), or jump directly to where you left off:
+// 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](part00.html)
-// * [Part 01](part01.html)
-// * [Part 02](part02.html)
-// * [Part 03](part03.html)
-// * [Part 04](part04.html) (WIP)
+// * [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)
 // * (to be continued)

-#![allow(dead_code, unused_imports, unused_variables)]
+#![allow(dead_code, unused_imports, unused_variables, unused_mut)]

 mod part00;
 mod part01;
 mod part02;
 mod part00;
 mod part01;
 mod part02;


@@ -78,6 +87,10 @@ mod part03;
 mod part04;
 mod part05;
 mod part06;
 mod part04;
 mod part05;
 mod part06;

+mod part07;
+mod part08;
+mod part09;
+mod part10;

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