mirror of
https://github.com/rust-unofficial/patterns
synced 2024-11-10 13:10:30 +00:00
291 lines
22 KiB
HTML
291 lines
22 KiB
HTML
<!DOCTYPE HTML>
|
||
<html lang="en" class="sidebar-visible no-js rust">
|
||
<head>
|
||
<!-- Book generated using mdBook -->
|
||
<meta charset="UTF-8">
|
||
<title>Design principles - Rust Design Patterns</title>
|
||
|
||
|
||
|
||
|
||
<!-- Custom HTML head -->
|
||
|
||
|
||
|
||
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
|
||
<meta name="description" content="A catalogue of Rust design patterns, anti-patterns and idioms">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||
<meta name="theme-color" content="#ffffff" />
|
||
|
||
|
||
<link rel="icon" href="../favicon.svg">
|
||
|
||
|
||
<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 rel="stylesheet" href="../fonts/fonts.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 -->
|
||
|
||
|
||
|
||
</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 ? "navy" : "rust";
|
||
</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('rust')
|
||
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 class="sidebar-scrollbox">
|
||
<ol class="chapter"><li class="chapter-item expanded "><a href="../intro.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="../idioms/index.html"><strong aria-hidden="true">2.</strong> Idioms</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../idioms/coercion-arguments.html"><strong aria-hidden="true">2.1.</strong> Use borrowed types for arguments</a></li><li class="chapter-item expanded "><a href="../idioms/concat-format.html"><strong aria-hidden="true">2.2.</strong> Concatenating Strings with format!</a></li><li class="chapter-item expanded "><a href="../idioms/ctor.html"><strong aria-hidden="true">2.3.</strong> Constructor</a></li><li class="chapter-item expanded "><a href="../idioms/default.html"><strong aria-hidden="true">2.4.</strong> The Default Trait</a></li><li class="chapter-item expanded "><a href="../idioms/deref.html"><strong aria-hidden="true">2.5.</strong> Collections Are Smart Pointers</a></li><li class="chapter-item expanded "><a href="../idioms/dtor-finally.html"><strong aria-hidden="true">2.6.</strong> Finalisation in Destructors</a></li><li class="chapter-item expanded "><a href="../idioms/mem-replace.html"><strong aria-hidden="true">2.7.</strong> mem::{take(), replace()}</a></li><li class="chapter-item expanded "><a href="../idioms/on-stack-dyn-dispatch.html"><strong aria-hidden="true">2.8.</strong> On-Stack Dynamic Dispatch</a></li><li class="chapter-item expanded "><a href="../idioms/ffi-intro.html"><strong aria-hidden="true">2.9.</strong> Foreign function interface usage</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../idioms/ffi-errors.html"><strong aria-hidden="true">2.9.1.</strong> Idiomatic Errors</a></li><li class="chapter-item expanded "><a href="../idioms/ffi-accepting-strings.html"><strong aria-hidden="true">2.9.2.</strong> Accepting Strings</a></li><li class="chapter-item expanded "><a href="../idioms/ffi-passing-strings.html"><strong aria-hidden="true">2.9.3.</strong> Passing Strings</a></li></ol></li><li class="chapter-item expanded "><a href="../idioms/option-iter.html"><strong aria-hidden="true">2.10.</strong> Iterating over an Option</a></li><li class="chapter-item expanded "><a href="../idioms/pass-var-to-closure.html"><strong aria-hidden="true">2.11.</strong> Pass Variables to Closure</a></li><li class="chapter-item expanded "><a href="../idioms/priv-extend.html"><strong aria-hidden="true">2.12.</strong> Privacy For Extensibility</a></li><li class="chapter-item expanded "><a href="../idioms/rustdoc-init.html"><strong aria-hidden="true">2.13.</strong> Easy doc initialization</a></li><li class="chapter-item expanded "><a href="../idioms/temporary-mutability.html"><strong aria-hidden="true">2.14.</strong> Temporary mutability</a></li></ol></li><li class="chapter-item expanded "><a href="../patterns/index.html"><strong aria-hidden="true">3.</strong> Design Patterns</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../patterns/builder.html"><strong aria-hidden="true">3.1.</strong> Builder</a></li><li class="chapter-item expanded "><a href="../patterns/compose-structs.html"><strong aria-hidden="true">3.2.</strong> Compose Structs</a></li><li class="chapter-item expanded "><a href="../patterns/entry.html"><strong aria-hidden="true">3.3.</strong> Entry API</a></li><li class="chapter-item expanded "><a href="../patterns/ffi-intro.html"><strong aria-hidden="true">3.4.</strong> Foreign function interface usage</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../patterns/ffi-export.html"><strong aria-hidden="true">3.4.1.</strong> Object-Based APIs</a></li><li class="chapter-item expanded "><a href="../patterns/ffi-wrappers.html"><strong aria-hidden="true">3.4.2.</strong> Type Consolidation into Wrappers</a></li></ol></li><li class="chapter-item expanded "><a href="../patterns/fold.html"><strong aria-hidden="true">3.5.</strong> Fold</a></li><li class="chapter-item expanded "><a href="../patterns/newtype.html"><strong aria-hidden="true">3.6.</strong> Newtype</a></li><li class="chapter-item expanded "><a href="../patterns/RAII.html"><strong aria-hidden="true">3.7.</strong> RAII Guards</a></li><li class="chapter-item expanded "><a href="../patterns/small-crates.html"><strong aria-hidden="true">3.8.</strong> Prefer Small Crates</a></li><li class="chapter-item expanded "><a href="../patterns/strategy.html"><strong aria-hidden="true">3.9.</strong> Strategy</a></li><li class="chapter-item expanded "><a href="../patterns/unsafe-mods.html"><strong aria-hidden="true">3.10.</strong> Contain unsafety in small modules</a></li><li class="chapter-item expanded "><a href="../patterns/visitor.html"><strong aria-hidden="true">3.11.</strong> Visitor</a></li></ol></li><li class="chapter-item expanded "><a href="../anti_patterns/index.html"><strong aria-hidden="true">4.</strong> Anti-patterns</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../anti_patterns/deny-warnings.html"><strong aria-hidden="true">4.1.</strong> #[deny(warnings)]</a></li><li class="chapter-item expanded "><a href="../anti_patterns/deref.html"><strong aria-hidden="true">4.2.</strong> Deref Polymorphism</a></li></ol></li><li class="chapter-item expanded "><a href="../functional/index.html"><strong aria-hidden="true">5.</strong> Functional Programming</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../functional/paradigms.html"><strong aria-hidden="true">5.1.</strong> Programming paradigms</a></li></ol></li><li class="chapter-item expanded "><a href="../additional_resources/index.html"><strong aria-hidden="true">6.</strong> Additional Resources</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../additional_resources/design-principles.html" class="active"><strong aria-hidden="true">6.1.</strong> Design principles</a></li></ol></li></ol>
|
||
</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-hover-placeholder"></div>
|
||
<div id="menu-bar" class="menu-bar sticky bordered">
|
||
<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</button></li>
|
||
<li role="none"><button role="menuitem" class="theme" id="rust">Rust (default)</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">Rust Design Patterns</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>
|
||
|
||
|
||
<a href="https://github.com/rust-unofficial/patterns" title="Git repository" aria-label="Git repository">
|
||
<i id="git-repository-button" class="fa fa-github"></i>
|
||
</a>
|
||
|
||
</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>
|
||
<h1><a class="header" href="#design-principles" id="design-principles">Design principles</a></h1>
|
||
<h2><a class="header" href="#a-brief-overview-over-common-design-principles" id="a-brief-overview-over-common-design-principles">A brief overview over common design principles</a></h2>
|
||
<hr />
|
||
<h2><a class="header" href="#a-hrefhttpsenwikipediaorgwikisolidsolida" id="a-hrefhttpsenwikipediaorgwikisolidsolida"><a href="https://en.wikipedia.org/wiki/SOLID">SOLID</a></a></h2>
|
||
<ul>
|
||
<li><a href="https://en.wikipedia.org/wiki/Single-responsibility_principle">Single Responsibility Principle (SRP)</a>:
|
||
A class should only have a single responsibility, that is, only changes to one part of the software's
|
||
specification should be able to affect the specification of the class.</li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Open%E2%80%93closed_principle">Open/Closed Principle (OCP)</a>:
|
||
"Software entities ... should be open for extension, but closed for modification."</li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Liskov_substitution_principle">Liskov Substitution Principle (LSP)</a>:
|
||
"Objects in a program should be replaceable with instances of their subtypes without altering the correctness
|
||
of that program."</li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Interface_segregation_principle">Interface Segregation Principle (ISP)</a>:
|
||
"Many client-specific interfaces are better than one general-purpose interface."</li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Dependency_inversion_principle">Dependency Inversion Principle (DIP)</a>:
|
||
One should "depend upon abstractions, [not] concretions."</li>
|
||
</ul>
|
||
<h2><a class="header" href="#a-hrefhttpsenwikipediaorgwikidon27t_repeat_yourselfdry-dont-repeat-yourselfa" id="a-hrefhttpsenwikipediaorgwikidon27t_repeat_yourselfdry-dont-repeat-yourselfa"><a href="https://en.wikipedia.org/wiki/Don%27t_repeat_yourself">DRY (Don’t Repeat Yourself)</a></a></h2>
|
||
<p>"Every piece of knowledge must have a single, unambiguous, authoritative representation within a system"</p>
|
||
<h2><a class="header" href="#a-hrefhttpsenwikipediaorgwikikiss_principlekiss-principlea" id="a-hrefhttpsenwikipediaorgwikikiss_principlekiss-principlea"><a href="https://en.wikipedia.org/wiki/KISS_principle">KISS principle</a></a></h2>
|
||
<p>most systems work best if they are kept simple rather than made complicated; therefore,
|
||
simplicity should be a key goal in design, and unnecessary complexity should be avoided</p>
|
||
<h2><a class="header" href="#a-hrefhttpsenwikipediaorgwikilaw_of_demeterlaw-of-demeter-loda" id="a-hrefhttpsenwikipediaorgwikilaw_of_demeterlaw-of-demeter-loda"><a href="https://en.wikipedia.org/wiki/Law_of_Demeter">Law of Demeter (LoD)</a></a></h2>
|
||
<p>a given object should assume as little as possible about the structure or properties of
|
||
anything else (including its subcomponents), in accordance with the principle of "information hiding"</p>
|
||
<h2><a class="header" href="#a-hrefhttpsenwikipediaorgwikidesign_by_contractdesign-by-contract-dbca" id="a-hrefhttpsenwikipediaorgwikidesign_by_contractdesign-by-contract-dbca"><a href="https://en.wikipedia.org/wiki/Design_by_contract">Design by contract (DbC)</a></a></h2>
|
||
<p>software designers should define formal, precise and verifiable interface specifications
|
||
for software components, which extend the ordinary definition of abstract data types with
|
||
preconditions, postconditions and invariants</p>
|
||
<h2><a class="header" href="#a-hrefhttpsenwikipediaorgwikiencapsulation_computer_programmingencapsulationa" id="a-hrefhttpsenwikipediaorgwikiencapsulation_computer_programmingencapsulationa"><a href="https://en.wikipedia.org/wiki/Encapsulation_(computer_programming)">Encapsulation</a></a></h2>
|
||
<p>bundling of data with the methods that operate on that data, or the restricting of
|
||
direct access to some of an object's components. Encapsulation is used to hide the
|
||
values or state of a structured data object inside a class, preventing unauthorized
|
||
parties' direct access to them.</p>
|
||
<h2><a class="header" href="#a-hrefhttpsenwikipediaorgwikicommande28093query_separationcommand-query-separationcqsa" id="a-hrefhttpsenwikipediaorgwikicommande28093query_separationcommand-query-separationcqsa"><a href="https://en.wikipedia.org/wiki/Command%E2%80%93query_separation">Command-Query-Separation(CQS)</a></a></h2>
|
||
<p>“Functions should not produce abstract side effects...only commands (procedures) will
|
||
be permitted to produce side effects.” - Bertrand Meyer: Object Oriented Software Construction</p>
|
||
<h2><a class="header" href="#a-hrefhttpsenwikipediaorgwikiprinciple_of_least_astonishmentprinciple-of-least-astonishment-polaa" id="a-hrefhttpsenwikipediaorgwikiprinciple_of_least_astonishmentprinciple-of-least-astonishment-polaa"><a href="https://en.wikipedia.org/wiki/Principle_of_least_astonishment">Principle of least astonishment (POLA)</a></a></h2>
|
||
<p>a component of a system should behave in a way that most users will expect it to behave.
|
||
The behavior should not astonish or surprise users</p>
|
||
<h2><a class="header" href="#linguistic-modular-units" id="linguistic-modular-units">Linguistic-Modular-Units</a></h2>
|
||
<p>“Modules must correspond to syntactic units in the language used.” - Bertrand Meyer:
|
||
Object Oriented Software Construction</p>
|
||
<h2><a class="header" href="#self-documentation" id="self-documentation">Self-Documentation</a></h2>
|
||
<p>“The designer of a module should strive to make all information about the module part of
|
||
the module itself.” - Bertrand Meyer: Object Oriented Software Construction</p>
|
||
<h2><a class="header" href="#uniform-access" id="uniform-access">Uniform-Access</a></h2>
|
||
<p>“All services offered by a module should be available through a uniform notation,
|
||
which does not betray whether they are implemented through storage or through computation.” -
|
||
Bertrand Meyer: Object Oriented Software Construction</p>
|
||
<h2><a class="header" href="#single-choice" id="single-choice">Single-Choice</a></h2>
|
||
<p>“Whenever a software system must support a set of alternatives, one and only one module
|
||
in the system should know their exhaustive list.” - Bertrand Meyer: Object Oriented
|
||
Software Construction</p>
|
||
<h2><a class="header" href="#persistence-closure" id="persistence-closure">Persistence-Closure</a></h2>
|
||
<p>“Whenever a storage mechanism stores an object, it must store with it the dependents
|
||
of that object. Whenever a retrieval mechanism retrieves a previously stored object,
|
||
it must also retrieve any dependent of that object that has not yet been retrieved.” -
|
||
Bertrand Meyer: Object Oriented Software Construction</p>
|
||
|
||
</main>
|
||
|
||
<nav class="nav-wrapper" aria-label="Page navigation">
|
||
<!-- Mobile navigation buttons -->
|
||
|
||
<a rel="prev" href="../additional_resources/index.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
||
<i class="fa fa-angle-left"></i>
|
||
</a>
|
||
|
||
|
||
|
||
|
||
<div style="clear: both"></div>
|
||
</nav>
|
||
</div>
|
||
</div>
|
||
|
||
<nav class="nav-wide-wrapper" aria-label="Page navigation">
|
||
|
||
<a rel="prev" href="../additional_resources/index.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
||
<i class="fa fa-angle-left"></i>
|
||
</a>
|
||
|
||
|
||
|
||
</nav>
|
||
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<script type="text/javascript">
|
||
window.playground_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 -->
|
||
|
||
|
||
|
||
|
||
</body>
|
||
</html>
|