diff options
Diffstat (limited to 'rust.html.markdown')
| -rw-r--r-- | rust.html.markdown | 56 |
1 files changed, 36 insertions, 20 deletions
diff --git a/rust.html.markdown b/rust.html.markdown index dcb54733..6b75fa87 100644 --- a/rust.html.markdown +++ b/rust.html.markdown @@ -5,23 +5,37 @@ contributors: filename: learnrust.rs --- -Rust is an in-development programming language developed by Mozilla Research. -It is relatively unique among systems languages in that it can assert memory -safety *at compile time* without resorting to garbage collection. Rust’s first -release, 0.1, occurred in January 2012, and development moves so quickly that at -the moment the use of stable releases is discouraged, and instead one should use -nightly builds. On January 9 2015, Rust 1.0 Alpha was released, and the rate of -changes to the Rust compiler that break existing code has dropped significantly -since. However, a complete guarantee of backward compatibility will not exist -until the final 1.0 release. +Rust is a programming language developed by Mozilla Research. +Rust combines low-level control over performance with high-level convenience and +safety guarantees. + +It achieves these goals without requiring a garbage collector or runtime, making +it possible to use Rust libraries as a "drop-in replacement" for C. + +Rust’s first release, 0.1, occurred in January 2012, and for 3 years development +moved so quickly that until recently the use of stable releases was discouraged +and instead the general advice was to use nightly builds. + +On May 15th 2015, Rust 1.0 was released with a complete guarantee of backward +compatibility. Improvements to compile times and other aspects of the compiler are +currently available in the nightly builds. Rust has adopted a train-based release +model with regular releases every six weeks. Rust 1.1 beta was made available at +the same time of the release of Rust 1.0. Although Rust is a relatively low-level language, Rust has some functional concepts that are generally found in higher-level languages. This makes Rust not only fast, but also easy and efficient to code in. ```rust -// This is a comment. Single-line look like this... -/* ...and multi-line comment look like this */ +// This is a comment. Line comments look like this... +// and extend multiple lines like this. + +/// Documentation comments look like this and support markdown notation. +/// # Examples +/// +/// ``` +/// let five = 5 +/// ``` /////////////// // 1. Basics // @@ -74,10 +88,11 @@ fn main() { let s: String = "hello world".to_string(); // A string slice – an immutable view into another string - // This is basically an immutable pointer to a string – it doesn’t + // This is basically an immutable pair of pointers to a string – it doesn’t // actually contain the contents of a string, just a pointer to - // something that does (in this case, `s`) - let s_slice: &str = &*s; + // the begin and a pointer to the end of a string buffer, + // statically allocated or contained in another object (in this case, `s`) + let s_slice: &str = &s; println!("{} {}", s, s_slice); // hello world hello world @@ -92,7 +107,7 @@ fn main() { // A slice – an immutable view into a vector or array // This is much like a string slice, but for vectors - let slice: &[i32] = &*vector; + let slice: &[i32] = &vector; // Use `{:?}` to print something debug-style println!("{:?} {:?}", vector, slice); // [1, 2, 3, 4, 5] [1, 2, 3, 4, 5] @@ -271,19 +286,20 @@ fn main() { var = 3; let ref_var: &i32 = &var; - println!("{}", var); // Unlike `box`, `var` can still be used + println!("{}", var); // Unlike `mine`, `var` can still be used println!("{}", *ref_var); // var = 5; // this would not compile because `var` is borrowed - // *ref_var = 6; // this would too, because `ref_var` is an immutable reference + // *ref_var = 6; // this would not either, because `ref_var` is an immutable reference // Mutable reference // While a value is mutably borrowed, it cannot be accessed at all. let mut var2 = 4; let ref_var2: &mut i32 = &mut var2; - *ref_var2 += 2; + *ref_var2 += 2; // '*' is used to point to the mutably borrowed var2 - println!("{}", *ref_var2); // 6 - // var2 = 2; // this would not compile because `var2` is borrowed + println!("{}", *ref_var2); // 6 , // var2 would not compile. + // ref_var2 is of type &mut i32, so stores a reference to an i32, not the value. + // var2 = 2; // this would not compile because `var2` is borrowed. } ``` |