pierre/RustBook
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
f836a9177d
RustBook/ch05-02-example-structs.html

424 lines
36 KiB
HTML
Raw Normal View History

Initial commit
2020-01-06 20:57:15 +00:00
<!DOCTYPE HTML>
<html lang="en" class="sidebar-visible no-js light">
<head>
<!-- Book generated using mdBook -->
<meta charset="UTF-8">
<title>An Example Program Using Structs - The Rust Programming Language</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="theme-color" content="#ffffff" />
<link rel="shortcut icon" href="favicon.png">
<link rel="stylesheet" href="css/variables.css">
<link rel="stylesheet" href="css/general.css">
<link rel="stylesheet" href="css/chrome.css">
<link rel="stylesheet" href="css/print.css" media="print">
<!-- Fonts -->
<link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
<link href="googleFonts/css.css" rel="stylesheet" type="text/css">
<!-- Highlight.js Stylesheets -->
<link rel="stylesheet" href="highlight.css">
<link rel="stylesheet" href="tomorrow-night.css">
<link rel="stylesheet" href="ayu-highlight.css">
<!-- Custom theme stylesheets -->
<link rel="stylesheet" href="ferris.css">
<link rel="stylesheet" href="theme/2018-edition.css">
</head>
<body>
<!-- Provide site root to javascript -->
<script type="text/javascript">
var path_to_root = "";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "light";
</script>
<!-- Work around some values being stored in localStorage wrapped in quotes -->
<script type="text/javascript">
try {
var theme = localStorage.getItem('mdbook-theme');
var sidebar = localStorage.getItem('mdbook-sidebar');
if (theme.startsWith('"') && theme.endsWith('"')) {
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
}
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
}
} catch (e) { }
</script>
<!-- Set the theme before any content is loaded, prevents flash -->
<script type="text/javascript">
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; }
var html = document.querySelector('html');
html.classList.remove('no-js')
html.classList.remove('light')
html.classList.add(theme);
html.classList.add('js');
</script>
<!-- Hide / unhide sidebar before it is displayed -->
<script type="text/javascript">
var html = document.querySelector('html');
var sidebar = 'hidden';
if (document.body.clientWidth >= 1080) {
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
sidebar = sidebar || 'visible';
}
html.classList.remove('sidebar-visible');
html.classList.add("sidebar-" + sidebar);
</script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
<div id="sidebar-scrollbox" class="sidebar-scrollbox">
<ol class="chapter"><li class="expanded affix "><a href="title-page.html">The Rust Programming Language</a></li><li class="expanded affix "><a href="foreword.html">Foreword</a></li><li class="expanded affix "><a href="ch00-00-introduction.html">Introduction</a></li><li class="expanded "><a href="ch01-00-getting-started.html"><strong aria-hidden="true">1.</strong> Getting Started</a></li><li><ol class="section"><li class="expanded "><a href="ch01-01-installation.html"><strong aria-hidden="true">1.1.</strong> Installation</a></li><li class="expanded "><a href="ch01-02-hello-world.html"><strong aria-hidden="true">1.2.</strong> Hello, World!</a></li><li class="expanded "><a href="ch01-03-hello-cargo.html"><strong aria-hidden="true">1.3.</strong> Hello, Cargo!</a></li></ol></li><li class="expanded "><a href="ch02-00-guessing-game-tutorial.html"><strong aria-hidden="true">2.</strong> Programming a Guessing Game</a></li><li class="expanded "><a href="ch03-00-common-programming-concepts.html"><strong aria-hidden="true">3.</strong> Common Programming Concepts</a></li><li><ol class="section"><li class="expanded "><a href="ch03-01-variables-and-mutability.html"><strong aria-hidden="true">3.1.</strong> Variables and Mutability</a></li><li class="expanded "><a href="ch03-02-data-types.html"><strong aria-hidden="true">3.2.</strong> Data Types</a></li><li class="expanded "><a href="ch03-03-how-functions-work.html"><strong aria-hidden="true">3.3.</strong> Functions</a></li><li class="expanded "><a href="ch03-04-comments.html"><strong aria-hidden="true">3.4.</strong> Comments</a></li><li class="expanded "><a href="ch03-05-control-flow.html"><strong aria-hidden="true">3.5.</strong> Control Flow</a></li></ol></li><li class="expanded "><a href="ch04-00-understanding-ownership.html"><strong aria-hidden="true">4.</strong> Understanding Ownership</a></li><li><ol class="section"><li class="expanded "><a href="ch04-01-what-is-ownership.html"><strong aria-hidden="true">4.1.</strong> What is Ownership?</a></li><li class="expanded "><a href="ch04-02-references-and-borrowing.html"><strong aria-hidden="true">4.2.</strong> References and Borrowing</a></li><li class="expanded "><a href="ch04-03-slices.html"><strong aria-hidden="true">4.3.</strong> The Slice Type</a></li></ol></li><li class="expanded "><a href="ch05-00-structs.html"><strong aria-hidden="true">5.</strong> Using Structs to Structure Related Data</a></li><li><ol class="section"><li class="expanded "><a href="ch05-01-defining-structs.html"><strong aria-hidden="true">5.1.</strong> Defining and Instantiating Structs</a></li><li class="expanded "><a href="ch05-02-example-structs.html" class="active"><strong aria-hidden="true">5.2.</strong> An Example Program Using Structs</a></li><li class="expanded "><a href="ch05-03-method-syntax.html"><strong aria-hidden="true">5.3.</strong> Method Syntax</a></li></ol></li><li class="expanded "><a href="ch06-00-enums.html"><strong aria-hidden="true">6.</strong> Enums and Pattern Matching</a></li><li><ol class="section"><li class="expanded "><a href="ch06-01-defining-an-enum.html"><strong aria-hidden="true">6.1.</strong> Defining an Enum</a></li><li class="expanded "><a href="ch06-02-match.html"><strong aria-hidden="true">6.2.</strong> The match Control Flow Operator</a></li><li class="expanded "><a href="ch06-03-if-let.html"><strong aria-hidden="true">6.3.</strong> Concise Control Flow with if let</a></li></ol></li><li class="expanded "><a href="ch07-00-managing-growing-projects-with-packages-crates-and-modules.html"><strong aria-hidden="true">7.</strong> Managing Growing Projects with Packages, Crates, and Modules</a></li><li><ol class="section"><li class="expanded "><a href="ch07-01-packages-and-crates.html"><strong aria-hidden="true">7.1.</strong> Packages and Crates</a></li><li class="expanded "><a href="ch07-02-defining-modules-to-control-scope-and-privacy.html"><strong aria-hidden="true">7.2.</strong> Defining Modules to Control Scope and Privacy</a></li><li class="expanded "><a href="ch07-03-paths-for-referring-to-an-item-in-the-modu
</div>
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
</nav>
<div id="page-wrapper" class="page-wrapper">
<div class="page">
<div id="menu-bar" class="menu-bar">
<div id="menu-bar-sticky-container">
<div class="left-buttons">
<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
<i class="fa fa-bars"></i>
</button>
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
<i class="fa fa-paint-brush"></i>
</button>
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
<li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li>
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
</ul>
<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
<i class="fa fa-search"></i>
</button>
</div>
<h1 class="menu-title">The Rust Programming Language</h1>
<div class="right-buttons">
<a href="print.html" title="Print this book" aria-label="Print this book">
<i id="print-button" class="fa fa-print"></i>
</a>
</div>
</div>
</div>
<div id="search-wrapper" class="hidden">
<form id="searchbar-outer" class="searchbar-outer">
<input type="search" name="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
</form>
<div id="searchresults-outer" class="searchresults-outer hidden">
<div id="searchresults-header" class="searchresults-header"></div>
<ul id="searchresults">
</ul>
</div>
</div>
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
<script type="text/javascript">
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
});
</script>
<div id="content" class="content">
<main>
<h2><a class="header" href="#an-example-program-using-structs" id="an-example-program-using-structs">An Example Program Using Structs</a></h2>
<p>To understand when we might want to use structs, let’s write a program that
calculates the area of a rectangle. We’ll start with single variables, and then
refactor the program until we’re using structs instead.</p>
<p>Let’s make a new binary project with Cargo called <em>rectangles</em> that will take
the width and height of a rectangle specified in pixels and calculate the area
of the rectangle. Listing 5-8 shows a short program with one way of doing
exactly that in our project’s <em>src/main.rs</em>.</p>
<p><span class="filename">Filename: src/main.rs</span></p>
<pre><pre class="playpen"><code class="language-rust">fn main() {
let width1 = 30;
let height1 = 50;
println!(
&quot;The area of the rectangle is {} square pixels.&quot;,
area(width1, height1)
);
}
fn area(width: u32, height: u32) -&gt; u32 {
width * height
}
</code></pre></pre>
<p><span class="caption">Listing 5-8: Calculating the area of a rectangle
specified by separate width and height variables</span></p>
<p>Now, run this program using <code>cargo run</code>:</p>
<pre><code class="language-text">The area of the rectangle is 1500 square pixels.
</code></pre>
<p>Even though Listing 5-8 works and figures out the area of the rectangle by
calling the <code>area</code> function with each dimension, we can do better. The width
and the height are related to each other because together they describe one
rectangle.</p>
<p>The issue with this code is evident in the signature of <code>area</code>:</p>
<pre><code class="language-rust ignore">fn area(width: u32, height: u32) -&gt; u32 {
</code></pre>
<p>The <code>area</code> function is supposed to calculate the area of one rectangle, but the
function we wrote has two parameters. The parameters are related, but that’s
not expressed anywhere in our program. It would be more readable and more
manageable to group width and height together. We’ve already discussed one way
we might do that in <a href="ch03-02-data-types.html#the-tuple-type">“The Tuple Type”</a><!-- ignore --> section
of Chapter 3: by using tuples.</p>
<h3><a class="header" href="#refactoring-with-tuples" id="refactoring-with-tuples">Refactoring with Tuples</a></h3>
<p>Listing 5-9 shows another version of our program that uses tuples.</p>
<p><span class="filename">Filename: src/main.rs</span></p>
<pre><pre class="playpen"><code class="language-rust">fn main() {
let rect1 = (30, 50);
println!(
&quot;The area of the rectangle is {} square pixels.&quot;,
area(rect1)
);
}
fn area(dimensions: (u32, u32)) -&gt; u32 {
dimensions.0 * dimensions.1
}
</code></pre></pre>
<p><span class="caption">Listing 5-9: Specifying the width and height of the
rectangle with a tuple</span></p>
<p>In one way, this program is better. Tuples let us add a bit of structure, and
we’re now passing just one argument. But in another way, this version is less
clear: tuples don’t name their elements, so our calculation has become more
confusing because we have to index into the parts of the tuple.</p>
<p>It doesn’t matter if we mix up width and height for the area calculation, but
if we want to draw the rectangle on the screen, it would matter! We would have
to keep in mind that <code>width</code> is the tuple index <code>0</code> and <code>height</code> is the tuple
index <code>1</code>. If someone else worked on this code, they would have to figure this
out and keep it in mind as well. It would be easy to forget or mix up these
values and cause errors, because we haven’t conveyed the meaning of our data in
our code.</p>
<h3><a class="header" href="#refactoring-with-structs-adding-more-meaning" id="refactoring-with-structs-adding-more-meaning">Refactoring with Structs: Adding More Meaning</a></h3>
<p>We use structs to add meaning by labeling the data. We can transform the tuple
we’re using into a data type with a name for the whole as well as names for the
parts, as shown in Listing 5-10.</p>
<p><span class="filename">Filename: src/main.rs</span></p>
<pre><pre class="playpen"><code class="language-rust">struct Rectangle {
width: u32,
height: u32,
}
fn main() {
let rect1 = Rectangle { width: 30, height: 50 };
println!(
&quot;The area of the rectangle is {} square pixels.&quot;,
area(&amp;rect1)
);
}
fn area(rectangle: &amp;Rectangle) -&gt; u32 {
rectangle.width * rectangle.height
}
</code></pre></pre>
<p><span class="caption">Listing 5-10: Defining a <code>Rectangle</code> struct</span></p>
<p>Here we’ve defined a struct and named it <code>Rectangle</code>. Inside the curly
brackets, we defined the fields as <code>width</code> and <code>height</code>, both of which have
type <code>u32</code>. Then in <code>main</code>, we created a particular instance of <code>Rectangle</code>
that has a width of 30 and a height of 50.</p>
<p>Our <code>area</code> function is now defined with one parameter, which we’ve named
<code>rectangle</code>, whose type is an immutable borrow of a struct <code>Rectangle</code>
instance. As mentioned in Chapter 4, we want to borrow the struct rather than
take ownership of it. This way, <code>main</code> retains its ownership and can continue
using <code>rect1</code>, which is the reason we use the <code>&amp;</code> in the function signature and
where we call the function.</p>
<p>The <code>area</code> function accesses the <code>width</code> and <code>height</code> fields of the <code>Rectangle</code>
instance. Our function signature for <code>area</code> now says exactly what we mean:
calculate the area of <code>Rectangle</code>, using its <code>width</code> and <code>height</code> fields. This
conveys that the width and height are related to each other, and it gives
descriptive names to the values rather than using the tuple index values of <code>0</code>
and <code>1</code>. This is a win for clarity.</p>
<h3><a class="header" href="#adding-useful-functionality-with-derived-traits" id="adding-useful-functionality-with-derived-traits">Adding Useful Functionality with Derived Traits</a></h3>
<p>It’d be nice to be able to print an instance of <code>Rectangle</code> while we’re
debugging our program and see the values for all its fields. Listing 5-11 tries
using the <code>println!</code> macro as we have used in previous chapters. This won’t
work, however.</p>
<p><span class="filename">Filename: src/main.rs</span></p>
<pre><code class="language-rust ignore does_not_compile">struct Rectangle {
width: u32,
height: u32,
}
fn main() {
let rect1 = Rectangle { width: 30, height: 50 };
println!(&quot;rect1 is {}&quot;, rect1);
}
</code></pre>
<p><span class="caption">Listing 5-11: Attempting to print a <code>Rectangle</code>
instance</span></p>
<p>When we compile this code, we get an error with this core message:</p>
<pre><code class="language-text">error[E0277]: `Rectangle` doesn't implement `std::fmt::Display`
</code></pre>
<p>The <code>println!</code> macro can do many kinds of formatting, and by default, the curly
brackets tell <code>println!</code> to use formatting known as <code>Display</code>: output intended
for direct end user consumption. The primitive types we’ve seen so far
implement <code>Display</code> by default, because there’s only one way you’d want to show
a <code>1</code> or any other primitive type to a user. But with structs, the way
<code>println!</code> should format the output is less clear because there are more
display possibilities: Do you want commas or not? Do you want to print the
curly brackets? Should all the fields be shown? Due to this ambiguity, Rust
doesn’t try to guess what we want, and structs don’t have a provided
implementation of <code>Display</code>.</p>
<p>If we continue reading the errors, we’ll find this helpful note:</p>
<pre><code class="language-text">= help: the trait `std::fmt::Display` is not implemented for `Rectangle`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
</code></pre>
<p>Let’s try it! The <code>println!</code> macro call will now look like <code>println!(&quot;rect1 is {:?}&quot;, rect1);</code>. Putting the specifier <code>:?</code> inside the curly brackets tells
<code>println!</code> we want to use an output format called <code>Debug</code>. The <code>Debug</code> trait
enables us to print our struct in a way that is useful for developers so we can
see its value while we’re debugging our code.</p>
<p>Compile the code with this change. Drat! We still get an error:</p>
<pre><code class="language-text">error[E0277]: `Rectangle` doesn't implement `std::fmt::Debug`
</code></pre>
<p>But again, the compiler gives us a helpful note:</p>
<pre><code class="language-text">= help: the trait `std::fmt::Debug` is not implemented for `Rectangle`
= note: add `#[derive(Debug)]` or manually implement `std::fmt::Debug`
</code></pre>
<p>Rust <em>does</em> include functionality to print out debugging information, but we
have to explicitly opt in to make that functionality available for our struct.
To do that, we add the annotation <code>#[derive(Debug)]</code> just before the struct
definition, as shown in Listing 5-12.</p>
<p><span class="filename">Filename: src/main.rs</span></p>
<pre><pre class="playpen"><code class="language-rust">#[derive(Debug)]
struct Rectangle {
width: u32,
height: u32,
}
fn main() {
let rect1 = Rectangle { width: 30, height: 50 };
println!(&quot;rect1 is {:?}&quot;, rect1);
}
</code></pre></pre>
<p><span class="caption">Listing 5-12: Adding the annotation to derive the <code>Debug</code>
trait and printing the <code>Rectangle</code> instance using debug formatting</span></p>
<p>Now when we run the program, we won’t get any errors, and we’ll see the
following output:</p>
<pre><code class="language-text">rect1 is Rectangle { width: 30, height: 50 }
</code></pre>
<p>Nice! It’s not the prettiest output, but it shows the values of all the fields
for this instance, which would definitely help during debugging. When we have
larger structs, it’s useful to have output that’s a bit easier to read; in
those cases, we can use <code>{:#?}</code> instead of <code>{:?}</code> in the <code>println!</code> string.
When we use the <code>{:#?}</code> style in the example, the output will look like this:</p>
<pre><code class="language-text">rect1 is Rectangle {
width: 30,
height: 50
}
</code></pre>
<p>Rust has provided a number of traits for us to use with the <code>derive</code> annotation
that can add useful behavior to our custom types. Those traits and their
behaviors are listed in Appendix C. We’ll cover how to implement these traits
with custom behavior as well as how to create your own traits in Chapter 10.</p>
<p>Our <code>area</code> function is very specific: it only computes the area of rectangles.
It would be helpful to tie this behavior more closely to our <code>Rectangle</code>
struct, because it won’t work with any other type. Let’s look at how we can
continue to refactor this code by turning the <code>area</code> function into an <code>area</code>
<em>method</em> defined on our <code>Rectangle</code> type.</p>
</main>
<nav class="nav-wrapper" aria-label="Page navigation">
<!-- Mobile navigation buttons -->
<a rel="prev" href="ch05-01-defining-structs.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
<a rel="next" href="ch05-03-method-syntax.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
<div style="clear: both"></div>
</nav>
</div>
</div>
<nav class="nav-wide-wrapper" aria-label="Page navigation">
<a href="ch05-01-defining-structs.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
<a href="ch05-03-method-syntax.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
</nav>
</div>
<script type="text/javascript">
window.playpen_copyable = true;
</script>
<script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
<script src="mark.min.js" type="text/javascript" charset="utf-8"></script>
<script src="searcher.js" type="text/javascript" charset="utf-8"></script>
<script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script>
<script src="highlight.js" type="text/javascript" charset="utf-8"></script>
<script src="book.js" type="text/javascript" charset="utf-8"></script>
<!-- Custom JS scripts -->
<script type="text/javascript" src="ferris.js"></script>
</body>
</html>
Reference in New Issue Copy Permalink