forked from mpusz/mp-units
2733 lines
92 KiB
HTML
2733 lines
92 KiB
HTML
|
||
<!doctype html>
|
||
<html lang="en" class="no-js">
|
||
<head>
|
||
|
||
<meta charset="utf-8">
|
||
<meta name="viewport" content="width=device-width,initial-scale=1">
|
||
|
||
<meta name="description" content="The quantities and units library for C++">
|
||
|
||
|
||
<meta name="author" content="mp-units Team">
|
||
|
||
|
||
<link rel="canonical" href="https://mpusz.github.io/mp-units/head/users_guide/framework_basics/design_overview/">
|
||
|
||
|
||
<link rel="prev" href="../interface_introduction/">
|
||
|
||
|
||
<link rel="next" href="../systems_of_quantities/">
|
||
|
||
|
||
<link rel="alternate" type="application/rss+xml" title="RSS feed" href="../../../feed_rss_created.xml">
|
||
<link rel="alternate" type="application/rss+xml" title="RSS feed of updated content" href="../../../feed_rss_updated.xml">
|
||
|
||
<link rel="icon" href="../../../assets/images/mp-units-color.svg">
|
||
<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.5.42">
|
||
|
||
|
||
|
||
<title>Design Overview - mp-units</title>
|
||
|
||
|
||
|
||
<link rel="stylesheet" href="../../../assets/stylesheets/main.0253249f.min.css">
|
||
|
||
|
||
<link rel="stylesheet" href="../../../assets/stylesheets/palette.06af60db.min.css">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
|
||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
|
||
<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
|
||
|
||
|
||
|
||
<link rel="stylesheet" href="../../../stylesheets/extra.css">
|
||
|
||
<script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<meta property="og:type" content="website" >
|
||
|
||
<meta property="og:title" content="Design Overview - mp-units" >
|
||
|
||
<meta property="og:description" content="The quantities and units library for C++" >
|
||
|
||
<meta property="og:image" content="https://mpusz.github.io/mp-units/head/assets/images/social/users_guide/framework_basics/design_overview.png" >
|
||
|
||
<meta property="og:image:type" content="image/png" >
|
||
|
||
<meta property="og:image:width" content="1200" >
|
||
|
||
<meta property="og:image:height" content="630" >
|
||
|
||
<meta property="og:url" content="https://mpusz.github.io/mp-units/head/users_guide/framework_basics/design_overview/" >
|
||
|
||
<meta name="twitter:card" content="summary_large_image" >
|
||
|
||
<meta name="twitter:title" content="Design Overview - mp-units" >
|
||
|
||
<meta name="twitter:description" content="The quantities and units library for C++" >
|
||
|
||
<meta name="twitter:image" content="https://mpusz.github.io/mp-units/head/assets/images/social/users_guide/framework_basics/design_overview.png" >
|
||
|
||
|
||
|
||
</head>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<body dir="ltr" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo">
|
||
|
||
|
||
<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
|
||
<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
|
||
<label class="md-overlay" for="__drawer"></label>
|
||
<div data-md-component="skip">
|
||
|
||
|
||
<a href="#design-overview" class="md-skip">
|
||
Skip to content
|
||
</a>
|
||
|
||
</div>
|
||
<div data-md-component="announce">
|
||
|
||
</div>
|
||
|
||
<div data-md-color-scheme="default" data-md-component="outdated" hidden>
|
||
|
||
<aside class="md-banner md-banner--warning">
|
||
<div class="md-banner__inner md-grid md-typeset">
|
||
|
||
You're not viewing the latest version.
|
||
<a href="../../../..">
|
||
<strong>Click here to go to latest.</strong>
|
||
</a>
|
||
|
||
</div>
|
||
<script>var el=document.querySelector("[data-md-component=outdated]"),outdated=__md_get("__outdated",sessionStorage);!0===outdated&&el&&(el.hidden=!1)</script>
|
||
</aside>
|
||
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<header class="md-header" data-md-component="header">
|
||
<nav class="md-header__inner md-grid" aria-label="Header">
|
||
<a href="../../.." title="mp-units" class="md-header__button md-logo" aria-label="mp-units" data-md-component="logo">
|
||
|
||
<img src="../../../assets/images/mp-units-transparent-white.svg" alt="logo">
|
||
|
||
</a>
|
||
<label class="md-header__button md-icon" for="__drawer">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg>
|
||
</label>
|
||
<div class="md-header__title" data-md-component="header-title">
|
||
<div class="md-header__ellipsis">
|
||
<div class="md-header__topic">
|
||
<span class="md-ellipsis">
|
||
mp-units
|
||
</span>
|
||
</div>
|
||
<div class="md-header__topic" data-md-component="header-topic">
|
||
<span class="md-ellipsis">
|
||
|
||
Design Overview
|
||
|
||
</span>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
<form class="md-header__option" data-md-component="palette">
|
||
|
||
|
||
|
||
|
||
<input class="md-option" data-md-color-media="(prefers-color-scheme)" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to light mode" type="radio" name="__palette" id="__palette_0">
|
||
|
||
<label class="md-header__button md-icon" title="Switch to light mode" for="__palette_1" hidden>
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7a5 5 0 0 0-5 5 5 5 0 0 0 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1M8 13h8v-2H8zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4a5 5 0 0 0 5-5 5 5 0 0 0-5-5"/></svg>
|
||
</label>
|
||
|
||
|
||
|
||
|
||
|
||
<input class="md-option" data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme="default" data-md-color-primary="custom" data-md-color-accent="custom" aria-label="Switch to dark mode" type="radio" name="__palette" id="__palette_1">
|
||
|
||
<label class="md-header__button md-icon" title="Switch to dark mode" for="__palette_2" hidden>
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 7a5 5 0 0 1 5 5 5 5 0 0 1-5 5 5 5 0 0 1-5-5 5 5 0 0 1 5-5m0 2a3 3 0 0 0-3 3 3 3 0 0 0 3 3 3 3 0 0 0 3-3 3 3 0 0 0-3-3m0-7 2.39 3.42C13.65 5.15 12.84 5 12 5s-1.65.15-2.39.42zM3.34 7l4.16-.35A7.2 7.2 0 0 0 5.94 8.5c-.44.74-.69 1.5-.83 2.29zm.02 10 1.76-3.77a7.131 7.131 0 0 0 2.38 4.14zM20.65 7l-1.77 3.79a7.02 7.02 0 0 0-2.38-4.15zm-.01 10-4.14.36c.59-.51 1.12-1.14 1.54-1.86.42-.73.69-1.5.83-2.29zM12 22l-2.41-3.44c.74.27 1.55.44 2.41.44.82 0 1.63-.17 2.37-.44z"/></svg>
|
||
</label>
|
||
|
||
|
||
|
||
|
||
|
||
<input class="md-option" data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme="slate" data-md-color-primary="black" data-md-color-accent="custom" aria-label="Switch to system preference" type="radio" name="__palette" id="__palette_2">
|
||
|
||
<label class="md-header__button md-icon" title="Switch to system preference" for="__palette_0" hidden>
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="m17.75 4.09-2.53 1.94.91 3.06-2.63-1.81-2.63 1.81.91-3.06-2.53-1.94L12.44 4l1.06-3 1.06 3zm3.5 6.91-1.64 1.25.59 1.98-1.7-1.17-1.7 1.17.59-1.98L15.75 11l2.06-.05L18.5 9l.69 1.95zm-2.28 4.95c.83-.08 1.72 1.1 1.19 1.85-.32.45-.66.87-1.08 1.27C15.17 23 8.84 23 4.94 19.07c-3.91-3.9-3.91-10.24 0-14.14.4-.4.82-.76 1.27-1.08.75-.53 1.93.36 1.85 1.19-.27 2.86.69 5.83 2.89 8.02a9.96 9.96 0 0 0 8.02 2.89m-1.64 2.02a12.08 12.08 0 0 1-7.8-3.47c-2.17-2.19-3.33-5-3.49-7.82-2.81 3.14-2.7 7.96.31 10.98 3.02 3.01 7.84 3.12 10.98.31"/></svg>
|
||
</label>
|
||
|
||
|
||
</form>
|
||
|
||
|
||
|
||
<script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script>
|
||
|
||
|
||
|
||
<label class="md-header__button md-icon" for="__search">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
|
||
</label>
|
||
<div class="md-search" data-md-component="search" role="dialog">
|
||
<label class="md-search__overlay" for="__search"></label>
|
||
<div class="md-search__inner" role="search">
|
||
<form class="md-search__form" name="search">
|
||
<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
|
||
<label class="md-search__icon md-icon" for="__search">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg>
|
||
</label>
|
||
<nav class="md-search__options" aria-label="Search">
|
||
|
||
<a href="javascript:void(0)" class="md-search__icon md-icon" title="Share" aria-label="Share" data-clipboard data-clipboard-text="" data-md-component="search-share" tabindex="-1">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M18 16.08c-.76 0-1.44.3-1.96.77L8.91 12.7c.05-.23.09-.46.09-.7s-.04-.47-.09-.7l7.05-4.11c.54.5 1.25.81 2.04.81a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3c0 .24.04.47.09.7L8.04 9.81C7.5 9.31 6.79 9 6 9a3 3 0 0 0-3 3 3 3 0 0 0 3 3c.79 0 1.5-.31 2.04-.81l7.12 4.15c-.05.21-.08.43-.08.66 0 1.61 1.31 2.91 2.92 2.91s2.92-1.3 2.92-2.91A2.92 2.92 0 0 0 18 16.08"/></svg>
|
||
</a>
|
||
|
||
<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/></svg>
|
||
</button>
|
||
</nav>
|
||
|
||
<div class="md-search__suggest" data-md-component="search-suggest"></div>
|
||
|
||
</form>
|
||
<div class="md-search__output">
|
||
<div class="md-search__scrollwrap" tabindex="0" data-md-scrollfix>
|
||
<div class="md-search-result" data-md-component="search-result">
|
||
<div class="md-search-result__meta">
|
||
Initializing search
|
||
</div>
|
||
<ol class="md-search-result__list" role="presentation"></ol>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
<div class="md-header__source">
|
||
<a href="https://github.com/mpusz/mp-units" title="Go to repository" class="md-source" data-md-component="source">
|
||
<div class="md-source__icon md-icon">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.6.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81"/></svg>
|
||
</div>
|
||
<div class="md-source__repository">
|
||
mpusz/mp-units
|
||
</div>
|
||
</a>
|
||
</div>
|
||
|
||
</nav>
|
||
|
||
</header>
|
||
|
||
<div class="md-container" data-md-component="container">
|
||
|
||
|
||
|
||
|
||
|
||
<nav class="md-tabs" aria-label="Tabs" data-md-component="tabs">
|
||
<div class="md-grid">
|
||
<ul class="md-tabs__list">
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-tabs__item">
|
||
<a href="../../.." class="md-tabs__link">
|
||
|
||
|
||
|
||
|
||
Home
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-tabs__item">
|
||
<a href="../../../getting_started/introduction/" class="md-tabs__link">
|
||
|
||
|
||
|
||
|
||
Getting Started
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-tabs__item md-tabs__item--active">
|
||
<a href="../../terms_and_definitions/" class="md-tabs__link">
|
||
|
||
|
||
|
||
|
||
User's Guide
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-tabs__item">
|
||
<a href="../../../api_reference/" class="md-tabs__link">
|
||
|
||
|
||
|
||
|
||
API Reference
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-tabs__item">
|
||
<a href="../../../blog/" class="md-tabs__link">
|
||
|
||
|
||
|
||
|
||
Blog
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-tabs__item">
|
||
<a href="../../../release_notes/" class="md-tabs__link">
|
||
|
||
|
||
|
||
|
||
Release Notes
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
</ul>
|
||
</div>
|
||
</nav>
|
||
|
||
|
||
|
||
<main class="md-main" data-md-component="main">
|
||
<div class="md-main__inner md-grid">
|
||
|
||
|
||
|
||
<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
|
||
<div class="md-sidebar__scrollwrap">
|
||
<div class="md-sidebar__inner">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<nav class="md-nav md-nav--primary md-nav--lifted md-nav--integrated" aria-label="Navigation" data-md-level="0">
|
||
<label class="md-nav__title" for="__drawer">
|
||
<a href="../../.." title="mp-units" class="md-nav__button md-logo" aria-label="mp-units" data-md-component="logo">
|
||
|
||
<img src="../../../assets/images/mp-units-transparent-white.svg" alt="logo">
|
||
|
||
</a>
|
||
mp-units
|
||
</label>
|
||
|
||
<div class="md-nav__source">
|
||
<a href="https://github.com/mpusz/mp-units" title="Go to repository" class="md-source" data-md-component="source">
|
||
<div class="md-source__icon md-icon">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.6.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81"/></svg>
|
||
</div>
|
||
<div class="md-source__repository">
|
||
mpusz/mp-units
|
||
</div>
|
||
</a>
|
||
</div>
|
||
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../.." class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Home
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_2" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_2" id="__nav_2_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Getting Started
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_2_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_2">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Getting Started
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../getting_started/introduction/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Introduction
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../getting_started/quick_start/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Quick Start
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../getting_started/look_and_feel/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Look and Feel
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../getting_started/project_structure/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Project Structure
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../getting_started/cpp_compiler_support/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
C++ compiler support (API/ABI)
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../getting_started/installation_and_usage/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Installation and Usage
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../getting_started/contributing/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Contributing
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../getting_started/faq/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
FAQ
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3" checked>
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_3" id="__nav_3_label" tabindex="">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
User's Guide
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="true">
|
||
<label class="md-nav__title" for="__nav_3">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
User's Guide
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../terms_and_definitions/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Terms and Definitions
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--active md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3_2" checked>
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_3_2" id="__nav_3_2_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Framework Basics
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_3_2_label" aria-expanded="true">
|
||
<label class="md-nav__title" for="__nav_3_2">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Framework Basics
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../interface_introduction/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Interface Introduction
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--active">
|
||
|
||
<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
|
||
|
||
|
||
|
||
|
||
|
||
<label class="md-nav__link md-nav__link--active" for="__toc">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Design Overview
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<a href="./" class="md-nav__link md-nav__link--active">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Design Overview
|
||
</span>
|
||
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<label class="md-nav__title" for="__toc">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Table of contents
|
||
</label>
|
||
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#dimension" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Dimension
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity-character" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity character
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity-specification" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity specification
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#unit" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Unit
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity-reference" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity reference
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity-representation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity representation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#point-origin" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Point origin
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity-point" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity point
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../systems_of_quantities/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Systems of Quantities
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../systems_of_units/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Systems of Units
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../simple_and_typed_quantities/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Simple and Typed Quantities
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../value_conversions/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Value Conversions
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../character_of_a_quantity/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Character of a Quantity
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../dimensionless_quantities/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Dimensionless Quantities
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../quantity_arithmetics/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Quantity Arithmetics
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../generic_interfaces/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Generic Interfaces
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../faster_than_lightspeed_constants/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Faster-than-lightspeed Constants
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../the_affine_space/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
The Affine Space
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../obtaining_metadata/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Obtaining Metadata
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../concepts/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Concepts
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../text_output/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Text Output
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3_3" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_3_3" id="__nav_3_3_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Systems
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_3_3_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_3_3">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Systems
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../systems/introduction/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Introduction
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../systems/isq/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
International System of Quantities (ISQ)
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../systems/si/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
International System of Units (SI)
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../systems/strong_angular_system/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Strong Angular System
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../systems/natural_units/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Natural Units
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3_4" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_3_4" id="__nav_3_4_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Use Cases
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_3_4_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_3_4">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Use Cases
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../use_cases/pure_dimensional_analysis/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Pure Dimensional Analysis
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../use_cases/working_with_legacy_interfaces/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Working with Legacy Interfaces
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../use_cases/using_custom_representation_types/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Using Custom Representation Types
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../use_cases/interoperability_with_other_libraries/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Interoperability with Other Libraries
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../use_cases/extending_the_library/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Extending the Library
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../use_cases/wide_compatibility/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Wide Compatibility
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3_5" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_3_5" id="__nav_3_5_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Examples
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_3_5_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_3_5">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Examples
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../examples/tags_index/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Tags Index
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3_5_2" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_3_5_2" id="__nav_3_5_2_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
All Examples
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="3" aria-labelledby="__nav_3_5_2_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_3_5_2">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
All Examples
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../examples/hello_units/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
hello_units
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../examples/avg_speed/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
avg_speed
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../examples/si_constants/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
si_constants
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../examples/hw_voltage/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
hw_voltage
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3_6" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_3_6" id="__nav_3_6_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Appendix
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_3_6_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_3_6">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Appendix
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../appendix/glossary/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Glossary
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../appendix/references/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
References
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../api_reference/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
API Reference
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5" >
|
||
|
||
|
||
|
||
<div class="md-nav__link md-nav__container">
|
||
<a href="../../../blog/" class="md-nav__link ">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Blog
|
||
</span>
|
||
|
||
|
||
</a>
|
||
|
||
|
||
<label class="md-nav__link " for="__nav_5" id="__nav_5_label" tabindex="0">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
</div>
|
||
|
||
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_5">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Blog
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_2" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_5_2" id="__nav_5_2_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Archive
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_2_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_5_2">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Archive
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../blog/archive/2024/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
2024
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../blog/archive/2023/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
2023
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_3" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_5_3" id="__nav_5_3_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Categories
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_3_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_5_3">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Categories
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../blog/category/metrology/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Metrology
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../blog/category/releases/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Releases
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../blog/category/wg21-updates/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
WG21 Updates
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../../release_notes/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Release Notes
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div class="md-content" data-md-component="content">
|
||
<article class="md-content__inner md-typeset">
|
||
|
||
|
||
|
||
|
||
<a href="https://github.com/mpusz/mp-units/edit/master/docs/users_guide/framework_basics/design_overview.md" title="Edit this page" class="md-content__button md-icon">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg>
|
||
</a>
|
||
|
||
|
||
|
||
|
||
|
||
<a href="https://github.com/mpusz/mp-units/raw/master/docs/users_guide/framework_basics/design_overview.md" title="View source of this page" class="md-content__button md-icon">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M17 18c.56 0 1 .44 1 1s-.44 1-1 1-1-.44-1-1 .44-1 1-1m0-3c-2.73 0-5.06 1.66-6 4 .94 2.34 3.27 4 6 4s5.06-1.66 6-4c-.94-2.34-3.27-4-6-4m0 6.5a2.5 2.5 0 0 1-2.5-2.5 2.5 2.5 0 0 1 2.5-2.5 2.5 2.5 0 0 1 2.5 2.5 2.5 2.5 0 0 1-2.5 2.5M9.27 20H6V4h7v5h5v4.07c.7.08 1.36.25 2 .49V8l-6-6H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h4.5a8.2 8.2 0 0 1-1.23-2"/></svg>
|
||
</a>
|
||
|
||
|
||
|
||
<h1 id="design-overview">Design Overview<a class="headerlink" href="#design-overview" title="Permanent link">¶</a></h1>
|
||
<p>The most important entities in the <strong>mp-units</strong> library are:</p>
|
||
<ul>
|
||
<li><a href="#quantity">quantity</a>,</li>
|
||
<li><a href="#quantity-point">quantity point</a>,</li>
|
||
<li><a href="#unit">unit</a>,</li>
|
||
<li><a href="#dimension">dimension</a>,</li>
|
||
<li><a href="#quantity-specification">quantity specification</a></li>
|
||
<li><a href="#quantity-reference">quantity reference</a>,</li>
|
||
<li><a href="#quantity-representation">quantity representation</a>.</li>
|
||
</ul>
|
||
<p>The graph provided below presents how those and a few other entities depend on each other:</p>
|
||
<pre class="mermaid"><code>flowchart TD
|
||
Unit --- Reference
|
||
Dimension --- QuantitySpec["Quantity specification"]
|
||
quantity_character["Quantity character"] --- QuantitySpec
|
||
QuantitySpec --- Reference["Quantity reference"]
|
||
Reference --- Quantity
|
||
quantity_character -.- Representation
|
||
Representation --- Quantity
|
||
Quantity --- QuantityPoint["Quantity point"]
|
||
PointOrigin["Point origin"] --- QuantityPoint
|
||
|
||
click Dimension "#dimension"
|
||
click quantity_character "#quantity-character"
|
||
click QuantitySpec "#quantity-specification"
|
||
click Unit "#unit"
|
||
click Reference "#quantity-reference"
|
||
click Representation "#quantity-representation"
|
||
click Quantity "#quantity"
|
||
click PointOrigin "#point-origin"
|
||
click QuantityPoint "#quantity-point"</code></pre>
|
||
<h2 id="dimension">Dimension<a class="headerlink" href="#dimension" title="Permanent link">¶</a></h2>
|
||
<p><a href="../../../appendix/glossary/#dimension">Dimension</a> specifies the dependence of a quantity on the base
|
||
quantities of a particular system of quantities. It is represented as a product of powers of factors
|
||
corresponding to the base quantities, omitting any numerical factor.</p>
|
||
<p>In the <strong>mp-units</strong> library, we use the terms:</p>
|
||
<ul>
|
||
<li><strong>base dimension</strong> to refer to the dimension of a <a href="../../../appendix/glossary/#base-quantity">base quantity</a>,</li>
|
||
<li><strong>derived dimension</strong> to refer to the dimension of a <a href="../../../appendix/glossary/#derived-quantity">derived quantity</a>.</li>
|
||
</ul>
|
||
<p>For example:</p>
|
||
<ul>
|
||
<li><em>length</em> (<span class="arithmatex">\(\mathsf{L}\)</span>), <em>mass</em> (<span class="arithmatex">\(\mathsf{M}\)</span>), <em>time</em> (<span class="arithmatex">\(\mathsf{T}\)</span>), <em>electric current</em> (<span class="arithmatex">\(\mathsf{I}\)</span>),
|
||
<em>thermodynamic temperature</em> (<span class="arithmatex">\(\mathsf{Θ}\)</span>), <em>amount of substance</em> (<span class="arithmatex">\(\mathsf{N}\)</span>), and
|
||
<em>luminous intensity</em> (<span class="arithmatex">\(\mathsf{J}\)</span>) are the base dimensions of the <a href="../../../appendix/glossary/#isq">ISQ</a>.</li>
|
||
<li>A derived dimension of <em>force</em> in the <a href="../../../appendix/glossary/#isq">ISQ</a> is denoted by
|
||
<span class="arithmatex">\(\textsf{dim }F = \mathsf{LMT}^{–2}\)</span>.</li>
|
||
<li>The implementation of IEC 80000 in this library provides <code>iec::dim_traffic_intensity</code>
|
||
base dimension to extend ISQ with strong information technology quantities.</li>
|
||
</ul>
|
||
<p><a href="../../../appendix/glossary/#base-dimension">Base dimensions</a> can be defined by the user in
|
||
the following way:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">dim_length</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">base_dimension</span><span class="o"><</span><span class="s">"L"</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">dim_length</span><span class="p">;</span>
|
||
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">dim_time</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">base_dimension</span><span class="o"><</span><span class="s">"T"</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">dim_time</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
<p><a href="../../../appendix/glossary/#derived-dimension">Derived dimensions</a> are implicitly created
|
||
by the library's framework based on the <a href="../../../appendix/glossary/#quantity-equation">quantity equation</a>
|
||
provided in the <a href="../../../appendix/glossary/#quantity_spec">quantity specification</a>:</p>
|
||
<div class="tabbed-set tabbed-alternate" data-tabs="1:3"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><input id="__tabbed_1_3" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">C++23</label><label for="__tabbed_1_2">C++20</label><label for="__tabbed_1_3">Portable</label></div>
|
||
<div class="tabbed-content">
|
||
<div class="tabbed-block">
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">length</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">dim_length</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">length</span><span class="p">;</span>
|
||
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">time</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">dim_time</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">time</span><span class="p">;</span>
|
||
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">speed</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">time</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">speed</span><span class="p">;</span>
|
||
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>
|
||
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="k">static_assert</span><span class="p">(</span><span class="n">speed</span><span class="p">.</span><span class="n">dimension</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">dim_length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">dim_time</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
</div>
|
||
<div class="tabbed-block">
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">length</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">length</span><span class="p">,</span><span class="w"> </span><span class="n">dim_length</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">length</span><span class="p">;</span>
|
||
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">time</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">time</span><span class="p">,</span><span class="w"> </span><span class="n">dim_time</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">time</span><span class="p">;</span>
|
||
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">speed</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">speed</span><span class="p">,</span><span class="w"> </span><span class="n">length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">time</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">speed</span><span class="p">;</span>
|
||
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>
|
||
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="k">static_assert</span><span class="p">(</span><span class="n">speed</span><span class="p">.</span><span class="n">dimension</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">dim_length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">dim_time</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
</div>
|
||
<div class="tabbed-block">
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="n">QUANTITY_SPEC</span><span class="p">(</span><span class="n">length</span><span class="p">,</span><span class="w"> </span><span class="n">dim_length</span><span class="p">);</span>
|
||
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="n">QUANTITY_SPEC</span><span class="p">(</span><span class="n">time</span><span class="p">,</span><span class="w"> </span><span class="n">dim_time</span><span class="p">);</span>
|
||
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="n">QUANTITY_SPEC</span><span class="p">(</span><span class="n">speed</span><span class="p">,</span><span class="w"> </span><span class="n">length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">time</span><span class="p">);</span>
|
||
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a>
|
||
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="k">static_assert</span><span class="p">(</span><span class="n">speed</span><span class="p">.</span><span class="n">dimension</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">dim_length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">dim_time</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="admonition important">
|
||
<p class="admonition-title">Important</p>
|
||
<p>Users should not explicitly define any derived dimensions. Those should always be implicitly
|
||
created by the framework.</p>
|
||
</div>
|
||
<p>The multiplication/division on quantity specifications also multiplies/divides their dimensions:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="k">static_assert</span><span class="p">((</span><span class="n">length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">time</span><span class="p">).</span><span class="n">dimension</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">dim_length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">dim_time</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
<p>The <a href="../../../appendix/glossary/#dimension-equation">dimension equation</a> of <code>isq::dim_length / isq::dim_time</code>
|
||
results in the <code>derived_dimension<isq::dim_length, per<isq::dim_time>></code> type.</p>
|
||
<h2 id="quantity-character">Quantity character<a class="headerlink" href="#quantity-character" title="Permanent link">¶</a></h2>
|
||
<p><a href="../../../appendix/references/#ISO80000">ISO 80000</a> explicitly states that quantities (even of the same kind) may have
|
||
different <a href="../../../appendix/glossary/#character">characters</a>:</p>
|
||
<ul>
|
||
<li>scalar,</li>
|
||
<li>vector,</li>
|
||
<li>tensor.</li>
|
||
</ul>
|
||
<p>The quantity character in the <strong>mp-units</strong> library is implemented with the <code>quantity_character</code> enumeration:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="k">enum</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">quantity_character</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">scalar</span><span class="p">,</span><span class="w"> </span><span class="n">vector</span><span class="p">,</span><span class="w"> </span><span class="n">tensor</span><span class="w"> </span><span class="p">};</span>
|
||
</span></code></pre></div>
|
||
<div class="admonition info">
|
||
<p class="admonition-title">Info</p>
|
||
<p>You can read more on quantity characters in the <a href="../character_of_a_quantity/">"Character of a Quantity"</a>
|
||
chapter.</p>
|
||
</div>
|
||
<h2 id="quantity-specification">Quantity specification<a class="headerlink" href="#quantity-specification" title="Permanent link">¶</a></h2>
|
||
<p><a href="../systems_of_quantities/#dimension-is-not-enough-to-describe-a-quantity">Dimension is not enough to describe a quantity</a>.
|
||
This is why the <a href="../../../appendix/references/#ISO80000">ISO 80000</a> provides hundreds of named quantity
|
||
types. It turns out that there are many more quantity types in the <a href="../../../appendix/glossary/#isq">ISQ</a>
|
||
than the named units in the <a href="../../../appendix/glossary/#si">SI</a>.</p>
|
||
<p>This is why the <strong>mp-units</strong> library introduces a quantity specification entity that stores:</p>
|
||
<ul>
|
||
<li><a href="../../../appendix/glossary/#dimension">dimension</a>,</li>
|
||
<li>quantity type/name,</li>
|
||
<li><a href="../../../appendix/glossary/#character">quantity character</a>,</li>
|
||
<li>the <a href="../../../appendix/glossary/#quantity-equation">quantity equation</a> being the recipe to create this quantity
|
||
(only for derived quantities that specify such a recipe).</li>
|
||
</ul>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>We know that it might be sometimes confusing to talk about quantities, quantity types/names, and quantity
|
||
specifications. However, it might be important to notice here that even the
|
||
<a href="../../../appendix/references/#ISO80000">ISO 80000</a> admits that:</p>
|
||
<blockquote>
|
||
<p>It is customary to use the same term, "quantity", to refer to both general quantities, such as length,
|
||
mass, etc., and their instances, such as given lengths, given masses, etc. Accordingly, we are used to
|
||
saying both that length is a quantity and that a given length is a quantity by maintaining the specification
|
||
– "general quantity, <span class="arithmatex">\(Q\)</span>" or "individual quantity, <span class="arithmatex">\(Q_\textsf{a}\)</span>" – implicit and exploiting the linguistic
|
||
context to remove the ambiguity.</p>
|
||
</blockquote>
|
||
<p>In the <strong>mp-units</strong> library, we have a:</p>
|
||
<ul>
|
||
<li><strong>quantity</strong> - implemented as a <code>quantity</code> class template,</li>
|
||
<li><strong>quantity specification</strong> - implemented with a <code>quantity_spec</code> class template that among others identifies
|
||
a specific <strong>quantity type/name</strong>.</li>
|
||
</ul>
|
||
</div>
|
||
<p>For example:</p>
|
||
<ul>
|
||
<li><code>isq::length</code>, <code>isq::mass</code>, <code>isq::time</code>, <code>isq::electric_current</code>, <code>isq::thermodynamic_temperature</code>,
|
||
<code>isq::amount_of_substance</code>, and <code>isq::luminous_intensity</code> are the specifications of base quantities
|
||
in the <a href="../../../appendix/glossary/#isq">ISQ</a>.</li>
|
||
<li><code>isq::width</code>, <code>isq::height</code>, <code>isq::radius</code>, and <code>isq::position_vector</code> are only a few of many
|
||
quantities of a kind length specified in the <a href="../../../appendix/glossary/#isq">ISQ</a>.</li>
|
||
<li><code>isq::area</code>, <code>isq::speed</code>, <code>isq::moment_of_force</code> are only a few of many derived quantities provided
|
||
in the <a href="../../../appendix/glossary/#isq">ISQ</a>.</li>
|
||
</ul>
|
||
<p>Quantity specification can be defined by the user in one of the following ways:</p>
|
||
<div class="tabbed-set tabbed-alternate" data-tabs="2:3"><input checked="checked" id="__tabbed_2_1" name="__tabbed_2" type="radio" /><input id="__tabbed_2_2" name="__tabbed_2" type="radio" /><input id="__tabbed_2_3" name="__tabbed_2" type="radio" /><div class="tabbed-labels"><label for="__tabbed_2_1">C++23</label><label for="__tabbed_2_2">C++20</label><label for="__tabbed_2_3">Portable</label></div>
|
||
<div class="tabbed-content">
|
||
<div class="tabbed-block">
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">length</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">dim_length</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">length</span><span class="p">;</span>
|
||
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">height</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">length</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">height</span><span class="p">;</span>
|
||
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">speed</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">time</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">speed</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
</div>
|
||
<div class="tabbed-block">
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">length</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">length</span><span class="p">,</span><span class="w"> </span><span class="n">dim_length</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">length</span><span class="p">;</span>
|
||
</span><span id="__span-7-2"><a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">height</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">height</span><span class="p">,</span><span class="w"> </span><span class="n">length</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">height</span><span class="p">;</span>
|
||
</span><span id="__span-7-3"><a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">speed</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">quantity_spec</span><span class="o"><</span><span class="n">speed</span><span class="p">,</span><span class="w"> </span><span class="n">length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">time</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">speed</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
</div>
|
||
<div class="tabbed-block">
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="n">QUANTITY_SPEC</span><span class="p">(</span><span class="n">length</span><span class="p">,</span><span class="w"> </span><span class="n">dim_length</span><span class="p">);</span>
|
||
</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="n">QUANTITY_SPEC</span><span class="p">(</span><span class="n">height</span><span class="p">,</span><span class="w"> </span><span class="n">length</span><span class="p">);</span>
|
||
</span><span id="__span-8-3"><a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a><span class="n">QUANTITY_SPEC</span><span class="p">(</span><span class="n">speed</span><span class="p">,</span><span class="w"> </span><span class="n">length</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">time</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>The <a href="../../../appendix/glossary/#quantity-equation">quantity equation</a> of <code>isq::length / isq::time</code> results
|
||
in the <code>derived_quantity_spec<isq::length, per<isq::time>></code> type.</p>
|
||
<h2 id="unit">Unit<a class="headerlink" href="#unit" title="Permanent link">¶</a></h2>
|
||
<p>A <a href="../../../appendix/glossary/#unit">unit</a> is a concrete amount of a quantity that allows us to
|
||
measure the values of <a href="../systems_of_quantities/#quantities-of-the-same-kind">quantities of the same kind</a>
|
||
and represent the result as a number being the ratio of the two quantities.</p>
|
||
<p>For example:</p>
|
||
<ul>
|
||
<li><code>si::second</code>, <code>si::metre</code>, <code>si::kilogram</code>, <code>si::ampere</code>, <code>si::kelvin</code>, <code>si::mole</code>, and <code>si::candela</code>
|
||
are the base units of the <a href="../../../appendix/glossary/#si">SI</a>.</li>
|
||
<li><code>si::kilo<si::metre></code> is a prefixed unit of length.</li>
|
||
<li><code>si::radian</code>, <code>si::newton</code>, and <code>si::watt</code> are examples of named derived units within the
|
||
<a href="../../../appendix/glossary/#si">SI</a>.</li>
|
||
<li><code>non_si::minute</code> is an example of a scaled unit of time.</li>
|
||
<li><code>si::si2019::speed_of_light_in_vacuum</code> is a physical constant standardized by the SI in 2019.</li>
|
||
</ul>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>In the <strong>mp-units</strong> library, <a href="../faster_than_lightspeed_constants/">physical constants are also implemented as units</a>.</p>
|
||
</div>
|
||
<p>A unit can be defined by the user in one of the following ways:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-9-1"><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="k">template</span><span class="o"><</span><span class="n">PrefixableUnit</span><span class="w"> </span><span class="n">U</span><span class="o">></span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">kilo_</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">prefixed_unit</span><span class="o"><</span><span class="s">"k"</span><span class="p">,</span><span class="w"> </span><span class="n">mag_power</span><span class="o"><</span><span class="mi">10</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">U</span><span class="p">{}</span><span class="o">></span><span class="w"> </span><span class="p">{};</span>
|
||
</span><span id="__span-9-2"><a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a><span class="k">template</span><span class="o"><</span><span class="n">PrefixableUnit</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">U</span><span class="o">></span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n">kilo_</span><span class="o"><</span><span class="k">decltype</span><span class="p">(</span><span class="n">U</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="n">kilo</span><span class="p">;</span>
|
||
</span><span id="__span-9-3"><a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a>
|
||
</span><span id="__span-9-4"><a id="__codelineno-9-4" name="__codelineno-9-4" href="#__codelineno-9-4"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">second</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">named_unit</span><span class="o"><</span><span class="s">"s"</span><span class="p">,</span><span class="w"> </span><span class="n">kind_of</span><span class="o"><</span><span class="n">isq</span><span class="o">::</span><span class="n">time</span><span class="o">>></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">second</span><span class="p">;</span>
|
||
</span><span id="__span-9-5"><a id="__codelineno-9-5" name="__codelineno-9-5" href="#__codelineno-9-5"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">minute</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">named_unit</span><span class="o"><</span><span class="s">"min"</span><span class="p">,</span><span class="w"> </span><span class="n">mag</span><span class="o"><</span><span class="mi">60</span><span class="o">></span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">second</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">minute</span><span class="p">;</span>
|
||
</span><span id="__span-9-6"><a id="__codelineno-9-6" name="__codelineno-9-6" href="#__codelineno-9-6"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">gram</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">named_unit</span><span class="o"><</span><span class="s">"g"</span><span class="p">,</span><span class="w"> </span><span class="n">kind_of</span><span class="o"><</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">>></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">gram</span><span class="p">;</span>
|
||
</span><span id="__span-9-7"><a id="__codelineno-9-7" name="__codelineno-9-7" href="#__codelineno-9-7"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">kilogram</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">kilo</span><span class="o"><</span><span class="n">gram</span><span class="o">></span><span class="p">;</span>
|
||
</span><span id="__span-9-8"><a id="__codelineno-9-8" name="__codelineno-9-8" href="#__codelineno-9-8"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">newton</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">named_unit</span><span class="o"><</span><span class="s">"N"</span><span class="p">,</span><span class="w"> </span><span class="n">kilogram</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">metre</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">square</span><span class="p">(</span><span class="n">second</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">newton</span><span class="p">;</span>
|
||
</span><span id="__span-9-9"><a id="__codelineno-9-9" name="__codelineno-9-9" href="#__codelineno-9-9"></a>
|
||
</span><span id="__span-9-10"><a id="__codelineno-9-10" name="__codelineno-9-10" href="#__codelineno-9-10"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">speed_of_light_in_vacuum</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">named_unit</span><span class="o"><</span><span class="s">"c"</span><span class="p">,</span><span class="w"> </span><span class="n">mag</span><span class="o"><</span><span class="mi">299'792'458</span><span class="o">></span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">metre</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">second</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">speed_of_light_in_vacuum</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
<p>The <a href="../../../appendix/glossary/#unit-equation">unit equation</a> of <code>si::metre / si::second</code> results
|
||
in the <code>derived_unit<si::metre, per<si::second>></code> type.</p>
|
||
<h2 id="quantity-reference">Quantity reference<a class="headerlink" href="#quantity-reference" title="Permanent link">¶</a></h2>
|
||
<p>ISO defines a quantity as:</p>
|
||
<div class="admonition quote">
|
||
<p class="admonition-title">Quote</p>
|
||
<p>property of a phenomenon, body, or substance, where the property has a magnitude
|
||
that can be expressed as a number and a <strong><em>reference</em></strong></p>
|
||
</div>
|
||
<p>After that, it says:</p>
|
||
<div class="admonition quote">
|
||
<p class="admonition-title">Quote</p>
|
||
<p>A reference can be a <strong><em>measurement unit</em></strong>, a measurement procedure, a reference material,
|
||
or a combination of such.</p>
|
||
</div>
|
||
<p>In the <strong>mp-units</strong> library, a quantity reference provides all the domain-specific metadata for the quantity
|
||
besides its <a href="../../../appendix/glossary/#numerical-value">numerical value</a>:</p>
|
||
<ul>
|
||
<li>all the data stored in the <a href="#quantity-specification">quantity specification</a>,</li>
|
||
<li><a href="#unit">unit</a>.</li>
|
||
</ul>
|
||
<p>Together with the value of a <a href="#quantity-representation">representation type</a>, it forms a quantity.</p>
|
||
<p>In the library, we have two different ways to provide a reference:</p>
|
||
<ul>
|
||
<li>every unit with the associated <a href="../systems_of_quantities/#quantities-of-the-same-kind">quantity kind</a>
|
||
is a valid reference,</li>
|
||
<li>providing a unit to an indexing operator of a quantity specification explicitly instantiates
|
||
a <code>reference</code> class template with this quantity spec and a unit passed as arguments.</li>
|
||
</ul>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>All the units of the <a href="../../../appendix/glossary/#si">SI</a> have associated quantity kinds
|
||
and may serve as a reference.</p>
|
||
</div>
|
||
<p>For example:</p>
|
||
<ul>
|
||
<li><code>si::metre</code> is defined in the <a href="../../../appendix/glossary/#si">SI</a> as a unit of <code>isq::length</code>
|
||
and thus can be used as a reference to instantiate a quantity of length (e.g., <code>42 * m</code>).</li>
|
||
<li>The expression <code>isq::height[m]</code> results with <code>reference<isq::height, si::metre></code>, which can be used to
|
||
instantiate a quantity of <code>isq::height</code> with a unit of <code>si::metre</code> (e.g., <code>42 * isq::height[m]</code>).</li>
|
||
</ul>
|
||
<h2 id="quantity-representation">Quantity representation<a class="headerlink" href="#quantity-representation" title="Permanent link">¶</a></h2>
|
||
<p>Quantity representation defines the type used to store the
|
||
<a href="../../../appendix/glossary/#quantity-value">numerical value of a quantity</a>. Such a type should be of
|
||
a specific <a href="#quantity-character">quantity character</a> provided in the
|
||
<a href="#quantity-specification">quantity specification</a>.</p>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>By default, all floating-point and integral (besides <code>bool</code>) types are treated as scalars.</p>
|
||
</div>
|
||
<h2 id="quantity">Quantity<a class="headerlink" href="#quantity" title="Permanent link">¶</a></h2>
|
||
<p>ISO defines a quantity as:</p>
|
||
<div class="admonition quote">
|
||
<p class="admonition-title">Quote</p>
|
||
<p>property of a phenomenon, body, or substance, where the property has a magnitude
|
||
that can be expressed as a <strong><em>number</em></strong> and a <strong><em>reference</em></strong></p>
|
||
</div>
|
||
<p>This is why a <code>quantity</code> class template is defined in the library as:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-10-1"><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="k">template</span><span class="o"><</span><span class="n">Reference</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">R</span><span class="p">,</span>
|
||
</span><span id="__span-10-2"><a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="w"> </span><span class="n">RepresentationOf</span><span class="o"><</span><span class="n">get_quantity_spec</span><span class="p">(</span><span class="n">R</span><span class="p">).</span><span class="n">character</span><span class="o">></span><span class="w"> </span><span class="n">Rep</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kt">double</span><span class="o">></span>
|
||
</span><span id="__span-10-3"><a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a><span class="k">class</span><span class="w"> </span><span class="nc">quantity</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
<p>Its value can be easily created by multiplying/dividing the <a href="#quantity-representation">numerical value</a>
|
||
and a <a href="#quantity-reference">reference</a>.</p>
|
||
<p>For example:</p>
|
||
<ul>
|
||
<li>All of <code>42 * m</code>, <code>42 * si::metre</code>, <code>42 * isq::height[m]</code>, and <code>isq::height(42 * m)</code> create a quantity.</li>
|
||
<li>A quantity type can also be specified explicitly (e.g., <code>quantity<si::metre, int></code>,
|
||
<code>quantity<isq::height[m]></code>).</li>
|
||
</ul>
|
||
<h2 id="point-origin">Point origin<a class="headerlink" href="#point-origin" title="Permanent link">¶</a></h2>
|
||
<p>In <a href="../the_affine_space/">the affine space theory</a>, the point origin specifies where the "zero" of our
|
||
measurement's scale is.</p>
|
||
<p>In the <strong>mp-units</strong> library, we have two types of point origins:</p>
|
||
<ul>
|
||
<li><a href="../the_affine_space/#absolute-point-origin">absolute</a> - defines an absolute "zero" for our point,</li>
|
||
<li><a href="../the_affine_space/#relative-point-origin">relative</a> - defines an origin that has some "offset" relative
|
||
to an absolute point.</li>
|
||
</ul>
|
||
<p>For example:</p>
|
||
<ul>
|
||
<li>the absolute point origin can be defined in the following way:</li>
|
||
</ul>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-11-1"><a id="__codelineno-11-1" name="__codelineno-11-1" href="#__codelineno-11-1"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">absolute_zero</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">absolute_point_origin</span><span class="o"><</span><span class="n">isq</span><span class="o">::</span><span class="n">thermodynamic_temperature</span><span class="o">></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">absolute_zero</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
<ul>
|
||
<li>the relative point origin can be defined in the following way:</li>
|
||
</ul>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-12-1"><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">ice_point</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">relative_point_origin</span><span class="o"><</span><span class="n">absolute_zero</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">273'150</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">milli</span><span class="o"><</span><span class="n">kelvin</span><span class="o">>></span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">ice_point</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
<h2 id="quantity-point">Quantity point<a class="headerlink" href="#quantity-point" title="Permanent link">¶</a></h2>
|
||
<p>Quantity point implements a <em>point</em> in <a href="../the_affine_space/">the affine space theory</a>.</p>
|
||
<p>In the <strong>mp-units</strong> library, the quantity point is implemented as:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-13-1"><a id="__codelineno-13-1" name="__codelineno-13-1" href="#__codelineno-13-1"></a><span class="k">template</span><span class="o"><</span><span class="n">Reference</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">R</span><span class="p">,</span>
|
||
</span><span id="__span-13-2"><a id="__codelineno-13-2" name="__codelineno-13-2" href="#__codelineno-13-2"></a><span class="w"> </span><span class="n">PointOriginFor</span><span class="o"><</span><span class="n">get_quantity_spec</span><span class="p">(</span><span class="n">R</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">PO</span><span class="p">,</span>
|
||
</span><span id="__span-13-3"><a id="__codelineno-13-3" name="__codelineno-13-3" href="#__codelineno-13-3"></a><span class="w"> </span><span class="n">RepresentationOf</span><span class="o"><</span><span class="n">get_quantity_spec</span><span class="p">(</span><span class="n">R</span><span class="p">).</span><span class="n">character</span><span class="o">></span><span class="w"> </span><span class="n">Rep</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kt">double</span><span class="o">></span>
|
||
</span><span id="__span-13-4"><a id="__codelineno-13-4" name="__codelineno-13-4" href="#__codelineno-13-4"></a><span class="k">class</span><span class="w"> </span><span class="nc">quantity_point</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
<p>Its value can be easily created by adding/subtracting the <a href="#quantity">quantity</a> with
|
||
a <a href="#point-origin">point origin</a>.</p>
|
||
<p>For example:</p>
|
||
<ul>
|
||
<li>The following specifies a quantity point defined in terms of an <code>ice_point</code> provided in
|
||
the previous example:</li>
|
||
</ul>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-14-1"><a id="__codelineno-14-1" name="__codelineno-14-1" href="#__codelineno-14-1"></a><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">room_reference_temperature</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ice_point</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">delta</span><span class="o"><</span><span class="n">isq</span><span class="o">::</span><span class="n">Celsius_temperature</span><span class="p">[</span><span class="n">deg_C</span><span class="p">]</span><span class="o">></span><span class="p">(</span><span class="mi">21</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</article>
|
||
</div>
|
||
|
||
|
||
<script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script>
|
||
</div>
|
||
|
||
<button type="button" class="md-top md-icon" data-md-component="top" hidden>
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg>
|
||
Back to top
|
||
</button>
|
||
|
||
</main>
|
||
|
||
<footer class="md-footer">
|
||
|
||
|
||
|
||
<nav class="md-footer__inner md-grid" aria-label="Footer" >
|
||
|
||
|
||
<a href="../interface_introduction/" class="md-footer__link md-footer__link--prev" aria-label="Previous: Interface Introduction">
|
||
<div class="md-footer__button md-icon">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg>
|
||
</div>
|
||
<div class="md-footer__title">
|
||
<span class="md-footer__direction">
|
||
Previous
|
||
</span>
|
||
<div class="md-ellipsis">
|
||
Interface Introduction
|
||
</div>
|
||
</div>
|
||
</a>
|
||
|
||
|
||
|
||
<a href="../systems_of_quantities/" class="md-footer__link md-footer__link--next" aria-label="Next: Systems of Quantities">
|
||
<div class="md-footer__title">
|
||
<span class="md-footer__direction">
|
||
Next
|
||
</span>
|
||
<div class="md-ellipsis">
|
||
Systems of Quantities
|
||
</div>
|
||
</div>
|
||
<div class="md-footer__button md-icon">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11z"/></svg>
|
||
</div>
|
||
</a>
|
||
|
||
</nav>
|
||
|
||
|
||
<div class="md-footer-meta md-typeset">
|
||
<div class="md-footer-meta__inner md-grid">
|
||
<div class="md-copyright">
|
||
|
||
<div class="md-copyright__highlight">
|
||
Copyright © 2018-2023 Mateusz Pusz
|
||
</div>
|
||
|
||
|
||
Made with
|
||
<a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener">
|
||
Material for MkDocs
|
||
</a>
|
||
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
</footer>
|
||
|
||
</div>
|
||
<div class="md-dialog" data-md-component="dialog">
|
||
<div class="md-dialog__inner md-typeset"></div>
|
||
</div>
|
||
|
||
|
||
<script id="__config" type="application/json">{"base": "../../..", "features": ["content.action.edit", "content.action.view", "content.code.annotate", "content.code.copy", "navigation.indexes", "navigation.tabs", "navigation.footer", "navigation.top", "search.highlight", "search.share", "search.suggest", "toc.follow", "toc.integrate"], "search": "../../../assets/javascripts/workers/search.6ce7567c.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}, "version": {"provider": "mike"}}</script>
|
||
|
||
|
||
<script src="../../../assets/javascripts/bundle.83f73b43.min.js"></script>
|
||
|
||
<script src="../../../javascripts/mathjax.js"></script>
|
||
|
||
<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
|
||
|
||
<script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
|
||
|
||
|
||
</body>
|
||
</html> |