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</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/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">
|
||
<a href="../design_overview/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Design Overview
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</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 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">
|
||
Text Output
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<a href="./" class="md-nav__link md-nav__link--active">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Text Output
|
||
</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="#derived-unit-symbols-generation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Derived unit symbols generation
|
||
</span>
|
||
</a>
|
||
|
||
<nav class="md-nav" aria-label="Derived unit symbols generation">
|
||
<ul class="md-nav__list">
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#unit_symbol_formatting" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
unit_symbol_formatting
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#unit_symbol" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
unit_symbol()
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#unit_symbol_to" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
unit_symbol_to()
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity-text-output" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity text output
|
||
</span>
|
||
</a>
|
||
|
||
<nav class="md-nav" aria-label="Quantity text output">
|
||
<ul class="md-nav__list">
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#customization-point" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Customization point
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#output-streams" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Output streams
|
||
</span>
|
||
</a>
|
||
|
||
<nav class="md-nav" aria-label="Output streams">
|
||
<ul class="md-nav__list">
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#output-stream-formatting" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Output stream formatting
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#stdformat" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
std::format
|
||
</span>
|
||
</a>
|
||
|
||
<nav class="md-nav" aria-label="std::format">
|
||
<ul class="md-nav__list">
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#grammar" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Grammar
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#default-formatting" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Default formatting
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#controlling-width-fill-and-alignment" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Controlling width, fill, and alignment
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity-value-symbol-or-both" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity value, symbol, or both?
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#quantity-value-formatting" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Quantity value formatting
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#unit-symbol-formatting" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Unit symbol formatting
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</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_3" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_3_3" id="__nav_3_3_label" tabindex="0">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Defining 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>
|
||
Defining Systems
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../defining_systems/introduction/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Introduction
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
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<h1 id="text-output">Text Output<a class="headerlink" href="#text-output" title="Permanent link">¶</a></h1>
|
||
<p>Besides providing dimensional analysis and units conversions, the library also tries hard to print
|
||
any quantity in the most user-friendly way.</p>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>The library does not provide a text output for quantity points, as printing just a number and a unit
|
||
is not enough to adequately describe a quantity point. Often an additional postfix is required.</p>
|
||
<p>For example, the text output of <code>42 m</code> may mean many things and can also be confused with an output
|
||
of a regular quantity. On the other hand, printing <code>42 m AMSL</code> for altitudes above mean sea level is
|
||
a much better solution, but the library does not have enough information to print it that way by itself.</p>
|
||
</div>
|
||
<h2 id="derived-unit-symbols-generation">Derived unit symbols generation<a class="headerlink" href="#derived-unit-symbols-generation" title="Permanent link">¶</a></h2>
|
||
<p>Based on the provided definitions for base units, the library creates symbols for derived ones.</p>
|
||
<h3 id="unit_symbol_formatting"><code>unit_symbol_formatting</code><a class="headerlink" href="#unit_symbol_formatting" title="Permanent link">¶</a></h3>
|
||
<p><code>unit_symbol_formatting</code> is a data type describing the configuration of the symbol generation
|
||
algorithm. It contains three orthogonal fields, and each of them has a default value.</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="k">enum</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">text_encoding</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="kt">int8_t</span><span class="w"> </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="w"> </span><span class="n">unicode</span><span class="p">,</span><span class="w"> </span><span class="c1">// m³; µs</span>
|
||
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="w"> </span><span class="n">ascii</span><span class="p">,</span><span class="w"> </span><span class="c1">// m^3; us</span>
|
||
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="n">default_encoding</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unicode</span>
|
||
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="p">};</span>
|
||
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a>
|
||
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="k">enum</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">unit_symbol_solidus</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="kt">int8_t</span><span class="w"> </span><span class="p">{</span>
|
||
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="n">one_denominator</span><span class="p">,</span><span class="w"> </span><span class="c1">// m/s; kg m⁻¹ s⁻¹</span>
|
||
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="n">always</span><span class="p">,</span><span class="w"> </span><span class="c1">// m/s; kg/(m s)</span>
|
||
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="n">never</span><span class="p">,</span><span class="w"> </span><span class="c1">// m s⁻¹; kg m⁻¹ s⁻¹</span>
|
||
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="n">default_denominator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">one_denominator</span>
|
||
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="p">};</span>
|
||
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a>
|
||
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="k">enum</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">unit_symbol_separator</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="kt">int8_t</span><span class="w"> </span><span class="p">{</span>
|
||
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="n">space</span><span class="p">,</span><span class="w"> </span><span class="c1">// kg m²/s²</span>
|
||
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="w"> </span><span class="n">half_high_dot</span><span class="p">,</span><span class="w"> </span><span class="c1">// kg⋅m²/s² (valid only for unicode encoding)</span>
|
||
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="n">default_separator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">space</span>
|
||
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="p">};</span>
|
||
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>
|
||
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="k">struct</span><span class="w"> </span><span class="nc">unit_symbol_formatting</span><span class="w"> </span><span class="p">{</span>
|
||
</span><span id="__span-0-21"><a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="n">text_encoding</span><span class="w"> </span><span class="n">encoding</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">text_encoding</span><span class="o">::</span><span class="n">default_encoding</span><span class="p">;</span>
|
||
</span><span id="__span-0-22"><a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="w"> </span><span class="n">unit_symbol_solidus</span><span class="w"> </span><span class="n">solidus</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unit_symbol_solidus</span><span class="o">::</span><span class="n">default_denominator</span><span class="p">;</span>
|
||
</span><span id="__span-0-23"><a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="w"> </span><span class="n">unit_symbol_separator</span><span class="w"> </span><span class="n">separator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unit_symbol_separator</span><span class="o">::</span><span class="n">default_separator</span><span class="p">;</span>
|
||
</span><span id="__span-0-24"><a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="p">};</span>
|
||
</span></code></pre></div>
|
||
<h3 id="unit_symbol"><code>unit_symbol()</code><a class="headerlink" href="#unit_symbol" title="Permanent link">¶</a></h3>
|
||
<p>Returns a <code>std::string_view</code> with the symbol of a unit for the provided configuration:</p>
|
||
<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="k">template</span><span class="o"><</span><span class="n">unit_symbol_formatting</span><span class="w"> </span><span class="n">fmt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unit_symbol_formatting</span><span class="p">{},</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">CharT</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kt">char</span><span class="p">,</span><span class="w"> </span><span class="n">Unit</span><span class="w"> </span><span class="n">U</span><span class="o">></span>
|
||
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="p">[[</span><span class="n">nodiscard</span><span class="p">]]</span><span class="w"> </span><span class="k">consteval</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">unit_symbol</span><span class="p">(</span><span class="n">U</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
<p>For example:</p>
|
||
<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="k">static_assert</span><span class="p">(</span><span class="n">unit_symbol</span><span class="o"><</span><span class="p">{.</span><span class="n">solidus</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unit_symbol_solidus</span><span class="o">::</span><span class="n">never</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="w"> </span><span class="p">.</span><span class="n">separator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unit_symbol_separator</span><span class="o">::</span><span class="n">half_high_dot</span><span class="p">}</span><span class="o">></span><span class="p">(</span><span class="n">kg</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="s">"kg⋅m⋅s⁻²"</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p><code>std::string_view</code> is returned only when C++23 is available. Otherwise, an instance of a
|
||
<code>basic_fixed_string</code> is being returned.</p>
|
||
</div>
|
||
<h3 id="unit_symbol_to"><code>unit_symbol_to()</code><a class="headerlink" href="#unit_symbol_to" title="Permanent link">¶</a></h3>
|
||
<p>Inserts the generated unit symbol to the output text iterator at runtime based on the provided
|
||
configuration.</p>
|
||
<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="k">template</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">CharT</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kt">char</span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">output_iterator</span><span class="o"><</span><span class="n">CharT</span><span class="o">></span><span class="w"> </span><span class="n">Out</span><span class="p">,</span><span class="w"> </span><span class="n">Unit</span><span class="w"> </span><span class="n">U</span><span class="o">></span>
|
||
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="k">constexpr</span><span class="w"> </span><span class="n">Out</span><span class="w"> </span><span class="n">unit_symbol_to</span><span class="p">(</span><span class="n">Out</span><span class="w"> </span><span class="n">out</span><span class="p">,</span><span class="w"> </span><span class="n">U</span><span class="w"> </span><span class="n">u</span><span class="p">,</span><span class="w"> </span><span class="n">unit_symbol_formatting</span><span class="w"> </span><span class="n">fmt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unit_symbol_formatting</span><span class="p">{});</span>
|
||
</span></code></pre></div>
|
||
<p>For example:</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="n">std</span><span class="o">::</span><span class="n">string</span><span class="w"> </span><span class="n">txt</span><span class="p">;</span>
|
||
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="n">unit_symbol_to</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">back_inserter</span><span class="p">(</span><span class="n">txt</span><span class="p">),</span><span class="w"> </span><span class="n">kg</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">,</span>
|
||
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="w"> </span><span class="p">{.</span><span class="n">solidus</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unit_symbol_solidus</span><span class="o">::</span><span class="n">never</span><span class="p">,</span><span class="w"> </span><span class="p">.</span><span class="n">separator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unit_symbol_separator</span><span class="o">::</span><span class="n">half_high_dot</span><span class="p">});</span>
|
||
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">txt</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
<p>The above prints:</p>
|
||
<div class="language-text highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>kg⋅m⋅s⁻²
|
||
</span></code></pre></div>
|
||
<h2 id="quantity-text-output">Quantity text output<a class="headerlink" href="#quantity-text-output" title="Permanent link">¶</a></h2>
|
||
<h3 id="customization-point">Customization point<a class="headerlink" href="#customization-point" title="Permanent link">¶</a></h3>
|
||
<p>The <a href="../../../appendix/references/#SIBrochure">SI Brochure</a> says:</p>
|
||
<div class="admonition quote">
|
||
<p class="admonition-title">SI Brochure</p>
|
||
<p>The numerical value always precedes the unit and a space is always used to separate the unit from
|
||
the number. ... The only exceptions to this rule are for the unit symbols for degree, minute and
|
||
second for plane angle, <code>°</code>, <code>′</code> and <code>″</code>, respectively, for which no space is left between the
|
||
numerical value and the unit symbol.</p>
|
||
</div>
|
||
<p>To support the above, the library exposes <code>space_before_unit_symbol</code> customization point. By default,
|
||
its value is <code>true</code> for all the units, so the space between a number and a unit will be present in the
|
||
output text. To change this behavior, we have to provide a partial specialization for a specific unit:</p>
|
||
<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="k">template</span><span class="o"><></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="kt">bool</span><span class="w"> </span><span class="n">space_before_unit_symbol</span><span class="o"><</span><span class="n">non_si</span><span class="o">::</span><span class="n">degree</span><span class="o">></span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
|
||
</span></code></pre></div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>The above works only for <a href="#default-formatting">the default formatting</a>. In case we provide our own
|
||
format specification (e.g. <code>std::format("{:%Q %q}", q)</code>), the library will always obey this
|
||
specification for all the units (no matter of what is the actual value of the
|
||
<code>space_before_unit_symbol</code> customization point) and the separating space will always be present
|
||
in this case.</p>
|
||
</div>
|
||
<h3 id="output-streams">Output streams<a class="headerlink" href="#output-streams" title="Permanent link">¶</a></h3>
|
||
<div class="admonition tip">
|
||
<p class="admonition-title">Tip</p>
|
||
<p>The output streaming support is opt-in and can be enabled by including the <code><mp-units/ostream.h></code>
|
||
header file.</p>
|
||
</div>
|
||
<p>The easiest way to print a quantity is to provide its object to the output stream:</p>
|
||
<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="k">using</span><span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="nn">mp_units</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="k">using</span><span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="nn">mp_units</span><span class="o">::</span><span class="nn">si</span><span class="o">::</span><span class="nn">unit_symbols</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="k">using</span><span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="nn">mp_units</span><span class="o">::</span><span class="nn">international</span><span class="o">::</span><span class="nn">unit_symbols</span><span class="p">;</span>
|
||
</span><span id="__span-7-4"><a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a>
|
||
</span><span id="__span-7-5"><a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a><span class="k">const</span><span class="w"> </span><span class="n">QuantityOf</span><span class="o"><</span><span class="n">isq</span><span class="o">::</span><span class="n">speed</span><span class="o">></span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">v1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">avg_speed</span><span class="p">(</span><span class="mf">220.</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">km</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">h</span><span class="p">);</span>
|
||
</span><span id="__span-7-6"><a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a><span class="k">const</span><span class="w"> </span><span class="n">QuantityOf</span><span class="o"><</span><span class="n">isq</span><span class="o">::</span><span class="n">speed</span><span class="o">></span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">v2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">avg_speed</span><span class="p">(</span><span class="mf">140.</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">mi</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">h</span><span class="p">);</span>
|
||
</span><span id="__span-7-7"><a id="__codelineno-7-7" name="__codelineno-7-7" href="#__codelineno-7-7"></a><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">v1</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="sc">'\n'</span><span class="p">;</span><span class="w"> </span><span class="c1">// 110 km/h</span>
|
||
</span><span id="__span-7-8"><a id="__codelineno-7-8" name="__codelineno-7-8" href="#__codelineno-7-8"></a><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">v2</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="sc">'\n'</span><span class="p">;</span><span class="w"> </span><span class="c1">// 70 mi/h</span>
|
||
</span></code></pre></div>
|
||
<p>The text output will always print the <a href="../../../appendix/glossary/#quantity-value">value of a quantity</a>
|
||
typically followed by a space and then the symbol of a <a href="../../../appendix/glossary/#unit">unit</a>
|
||
associated with this quantity.</p>
|
||
<div class="admonition important">
|
||
<p class="admonition-title">Important: Don't assume a unit</p>
|
||
<p>Remember that when we deal with a quantity of an "unknown" (e.g. <code>auto</code>) type, it is a good
|
||
practice to always <a href="../value_conversions/#value-conversions">convert the unit to the expected one</a>
|
||
before passing it to the text output:</p>
|
||
<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">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">v1</span><span class="p">.</span><span class="n">in</span><span class="p">(</span><span class="n">km</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">h</span><span class="p">)</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="sc">'\n'</span><span class="p">;</span><span class="w"> </span><span class="c1">// 110 km/h</span>
|
||
</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">v1</span><span class="p">.</span><span class="n">force_in</span><span class="p">(</span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s</span><span class="p">)</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="sc">'\n'</span><span class="p">;</span><span class="w"> </span><span class="c1">// 30.5556 m/s</span>
|
||
</span></code></pre></div>
|
||
</div>
|
||
<h4 id="output-stream-formatting">Output stream formatting<a class="headerlink" href="#output-stream-formatting" title="Permanent link">¶</a></h4>
|
||
<p>Only basic formatting can be applied for output streams. It includes control over width, fill,
|
||
and alignment of the entire quantity and formatting of a quantity numerical value according
|
||
to the general C++ rules:</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="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"|"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">setw</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"|</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span><span class="w"> </span><span class="c1">// | 123 m|</span>
|
||
</span><span id="__span-9-2"><a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"|"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">setw</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">left</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"|</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span><span class="w"> </span><span class="c1">// |123 m |</span>
|
||
</span><span id="__span-9-3"><a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"|"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">setw</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">setfill</span><span class="p">(</span><span class="sc">'*'</span><span class="p">)</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"|</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span><span class="w"> </span><span class="c1">// |123 m*****|</span>
|
||
</span></code></pre></div>
|
||
<h3 id="stdformat"><code>std::format</code><a class="headerlink" href="#stdformat" title="Permanent link">¶</a></h3>
|
||
<div class="admonition tip">
|
||
<p class="admonition-title">Tip</p>
|
||
<p>The text formatting facility support is opt-in and can be enabled by including the
|
||
<code><mp-units/format.h></code> header file.</p>
|
||
</div>
|
||
<p>The <strong>mp-units</strong> library provides custom formatters for <code>std::format</code> facility which allows
|
||
fine-grained control over what and how it is being printed in the text output.</p>
|
||
<h4 id="grammar">Grammar<a class="headerlink" href="#grammar" title="Permanent link">¶</a></h4>
|
||
<div class="language-text highlight"><pre><span></span><code><span id="__span-10-1"><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a>units-format-spec ::= [fill-and-align] [width] [units-specs]
|
||
</span><span id="__span-10-2"><a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a>units-specs ::= conversion-spec
|
||
</span><span id="__span-10-3"><a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a> units-specs conversion-spec
|
||
</span><span id="__span-10-4"><a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a> units-specs literal-char
|
||
</span><span id="__span-10-5"><a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a>literal-char ::= any character other than '{' or '}'
|
||
</span><span id="__span-10-6"><a id="__codelineno-10-6" name="__codelineno-10-6" href="#__codelineno-10-6"></a>conversion-spec ::= '%' units-type
|
||
</span><span id="__span-10-7"><a id="__codelineno-10-7" name="__codelineno-10-7" href="#__codelineno-10-7"></a>units-type ::= [units-rep-modifier] 'Q'
|
||
</span><span id="__span-10-8"><a id="__codelineno-10-8" name="__codelineno-10-8" href="#__codelineno-10-8"></a> [units-unit-modifier] 'q'
|
||
</span><span id="__span-10-9"><a id="__codelineno-10-9" name="__codelineno-10-9" href="#__codelineno-10-9"></a>units-rep-modifier ::= [sign] [#] [precision] [L] [units-rep-type]
|
||
</span><span id="__span-10-10"><a id="__codelineno-10-10" name="__codelineno-10-10" href="#__codelineno-10-10"></a>units-rep-type ::= one of "aAbBdeEfFgGoxX"
|
||
</span><span id="__span-10-11"><a id="__codelineno-10-11" name="__codelineno-10-11" href="#__codelineno-10-11"></a>units-unit-modifier ::= [units-text-encoding units-unit-symbol-denominator units-unit-symbol-separator]
|
||
</span><span id="__span-10-12"><a id="__codelineno-10-12" name="__codelineno-10-12" href="#__codelineno-10-12"></a>units-text-encoding ::= one of "UA"
|
||
</span><span id="__span-10-13"><a id="__codelineno-10-13" name="__codelineno-10-13" href="#__codelineno-10-13"></a>units-unit-symbol-solidus ::= one of "oan"
|
||
</span><span id="__span-10-14"><a id="__codelineno-10-14" name="__codelineno-10-14" href="#__codelineno-10-14"></a>units-unit-symbol-separator ::= one of "sd"
|
||
</span></code></pre></div>
|
||
<p>In the above grammar:</p>
|
||
<ul>
|
||
<li><code>fill-and-align</code>, <code>width</code>, <code>sign</code>, <code>#</code>, <code>precision</code>, and <code>L</code> tokens, as well as the individual
|
||
tokens of <code>units-rep-type</code> are defined in the <a href="https://wg21.link/format.string.std">format.string.std</a>
|
||
chapter of the C++ standard specification,</li>
|
||
<li>tokens <code>Q</code> and <code>q</code> of <code>units-type</code> are described in the <a href="https://wg21.link/time.format">time.format</a>
|
||
chapter of the C++ standard specification,</li>
|
||
<li><code>units-text-encoding</code> tokens specify the unit text encoding:<ul>
|
||
<li><code>U</code> (default) uses the <strong>Unicode</strong> symbols defined by the <a href="../../../appendix/glossary/#si">SI</a>
|
||
specification (e.g. <code>m³</code>, <code>µs</code>)</li>
|
||
<li><code>A</code> token forces non-standard <strong>ASCII</strong>-only output (e.g. <code>m^3</code>, <code>us</code>)</li>
|
||
</ul>
|
||
</li>
|
||
<li><code>units-unit-symbol-solidus</code> tokens specify how the division of units should look like:<ul>
|
||
<li><code>o</code> (default) outputs <code>/</code> only when there is only <strong>one</strong> unit in the denominator, otherwise negative
|
||
exponents are printed (e.g. <code>m/s</code>, <code>kg m⁻¹ s⁻¹</code>)</li>
|
||
<li><code>a</code> <strong>always</strong> uses solidus (e.g. <code>m/s</code>, <code>kg/(m s)</code>)</li>
|
||
<li><code>n</code> <strong>never</strong> prints solidus, which means that negative exponents are always used (e.g. <code>m s⁻¹</code>,
|
||
<code>kg m⁻¹ s⁻¹</code>)</li>
|
||
</ul>
|
||
</li>
|
||
<li><code>units-unit-symbol-separator</code> tokens specify how multiplied unit symbols should be separated:<ul>
|
||
<li><code>s</code> (default) uses <strong>space</strong> as a separator (e.g. <code>kg m²/s²</code>)</li>
|
||
<li><code>d</code> uses half-high <strong>dot</strong> (<code>⋅</code>) as a separator (e.g. <code>kg⋅m²/s²</code>)</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<h4 id="default-formatting">Default formatting<a class="headerlink" href="#default-formatting" title="Permanent link">¶</a></h4>
|
||
<p>To format <code>quantity</code> values, the formatting facility uses <code>units-format-spec</code>. If left empty,
|
||
the default formatting is applied. The same default formatting is also applied to the output streams.
|
||
This is why the following code lines produce the same output:</p>
|
||
<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="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"Distance: "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">km</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
||
</span><span id="__span-11-2"><a id="__codelineno-11-2" name="__codelineno-11-2" href="#__codelineno-11-2"></a><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"Distance: {}</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">km</span><span class="p">);</span>
|
||
</span><span id="__span-11-3"><a id="__codelineno-11-3" name="__codelineno-11-3" href="#__codelineno-11-3"></a><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"Distance: {:%Q %q}</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">km</span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>For some quantities the <code>{:%Q %q}</code> format may provide a different output than the default one.
|
||
It will happen for example for:</p>
|
||
<ul>
|
||
<li>units for which <a href="#customization-point"><code>space_before_unit_symbol</code></a> customization point is set
|
||
to <code>false</code>,</li>
|
||
<li>quantities of dimension one with a unit one.</li>
|
||
</ul>
|
||
</div>
|
||
<h4 id="controlling-width-fill-and-alignment">Controlling width, fill, and alignment<a class="headerlink" href="#controlling-width-fill-and-alignment" title="Permanent link">¶</a></h4>
|
||
<p>To control width, fill, and alignment, the C++ standard grammar tokens <code>fill-and-align</code> and <code>width</code>
|
||
are being used, and they treat a quantity value and symbol as a contiguous text:</p>
|
||
<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="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"|{:0}|"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// |123 m|</span>
|
||
</span><span id="__span-12-2"><a id="__codelineno-12-2" name="__codelineno-12-2" href="#__codelineno-12-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"|{:10}|"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// | 123 m|</span>
|
||
</span><span id="__span-12-3"><a id="__codelineno-12-3" name="__codelineno-12-3" href="#__codelineno-12-3"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"|{:<10}|"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// |123 m |</span>
|
||
</span><span id="__span-12-4"><a id="__codelineno-12-4" name="__codelineno-12-4" href="#__codelineno-12-4"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"|{:>10}|"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// | 123 m|</span>
|
||
</span><span id="__span-12-5"><a id="__codelineno-12-5" name="__codelineno-12-5" href="#__codelineno-12-5"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"|{:^10}|"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// | 123 m |</span>
|
||
</span><span id="__span-12-6"><a id="__codelineno-12-6" name="__codelineno-12-6" href="#__codelineno-12-6"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"|{:*<10}|"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// |123 m*****|</span>
|
||
</span><span id="__span-12-7"><a id="__codelineno-12-7" name="__codelineno-12-7" href="#__codelineno-12-7"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"|{:*>10}|"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// |*****123 m|</span>
|
||
</span><span id="__span-12-8"><a id="__codelineno-12-8" name="__codelineno-12-8" href="#__codelineno-12-8"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"|{:*^10}|"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// |**123 m***|</span>
|
||
</span></code></pre></div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p><a href="https://en.cppreference.com/w/cpp/io/print"><code>std::println</code> is a C++23 facility</a>. In case we
|
||
do not have access to C++23, we can obtain the same output with:</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="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"<format-string></span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="o"><</span><span class="n">format</span><span class="o">-</span><span class="n">args</span><span class="o">></span><span class="p">);</span>
|
||
</span></code></pre></div>
|
||
</div>
|
||
<h4 id="quantity-value-symbol-or-both">Quantity value, symbol, or both?<a class="headerlink" href="#quantity-value-symbol-or-both" title="Permanent link">¶</a></h4>
|
||
<p>The user can easily decide to either print a whole quantity (value and symbol) or only its parts.
|
||
Also, a custom style of quantity formatting might be applied:</p>
|
||
<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="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">km</span><span class="p">);</span><span class="w"> </span><span class="c1">// 123</span>
|
||
</span><span id="__span-14-2"><a id="__codelineno-14-2" name="__codelineno-14-2" href="#__codelineno-14-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">km</span><span class="p">);</span><span class="w"> </span><span class="c1">// km</span>
|
||
</span><span id="__span-14-3"><a id="__codelineno-14-3" name="__codelineno-14-3" href="#__codelineno-14-3"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q%q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">123</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">km</span><span class="p">);</span><span class="w"> </span><span class="c1">// 123km</span>
|
||
</span></code></pre></div>
|
||
<h4 id="quantity-value-formatting">Quantity value formatting<a class="headerlink" href="#quantity-value-formatting" title="Permanent link">¶</a></h4>
|
||
<p><code>sign</code> token allows us to specify how the value's sign is being printed:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-15-1"><a id="__codelineno-15-1" name="__codelineno-15-1" href="#__codelineno-15-1"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{0:%Q %q},{0:%+Q %q},{0:%-Q %q},{0:% Q %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 m,+1 m,1 m, 1 m</span>
|
||
</span><span id="__span-15-2"><a id="__codelineno-15-2" name="__codelineno-15-2" href="#__codelineno-15-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{0:%Q %q},{0:%+Q %q},{0:%-Q %q},{0:% Q %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">-1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// -1 m,-1 m,-1 m,-1 m</span>
|
||
</span></code></pre></div>
|
||
<p>where:</p>
|
||
<ul>
|
||
<li><code>+</code> indicates that a sign should be used for both non-negative and negative numbers,</li>
|
||
<li><code>-</code> indicates that a sign should be used for negative numbers and negative zero only
|
||
(this is the default behavior),</li>
|
||
<li><code><space></code> indicates that a leading space should be used for non-negative numbers other
|
||
than negative zero, and a minus sign for negative numbers and negative zero.</li>
|
||
</ul>
|
||
<p><code>precision</code> token is allowed only for floating-point representation types:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-16-1"><a id="__codelineno-16-1" name="__codelineno-16-1" href="#__codelineno-16-1"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.0Q %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 m</span>
|
||
</span><span id="__span-16-2"><a id="__codelineno-16-2" name="__codelineno-16-2" href="#__codelineno-16-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.1Q %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.2 m</span>
|
||
</span><span id="__span-16-3"><a id="__codelineno-16-3" name="__codelineno-16-3" href="#__codelineno-16-3"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.2Q %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23 m</span>
|
||
</span></code></pre></div>
|
||
<p><code>units-rep-type</code> specifies how a value of the representation type is being printed.
|
||
For integral types:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-17-1"><a id="__codelineno-17-1" name="__codelineno-17-1" href="#__codelineno-17-1"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%bQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 101010 m</span>
|
||
</span><span id="__span-17-2"><a id="__codelineno-17-2" name="__codelineno-17-2" href="#__codelineno-17-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%BQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 101010 m</span>
|
||
</span><span id="__span-17-3"><a id="__codelineno-17-3" name="__codelineno-17-3" href="#__codelineno-17-3"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%dQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 42 m</span>
|
||
</span><span id="__span-17-4"><a id="__codelineno-17-4" name="__codelineno-17-4" href="#__codelineno-17-4"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%oQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 52 m</span>
|
||
</span><span id="__span-17-5"><a id="__codelineno-17-5" name="__codelineno-17-5" href="#__codelineno-17-5"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%xQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 2a m</span>
|
||
</span><span id="__span-17-6"><a id="__codelineno-17-6" name="__codelineno-17-6" href="#__codelineno-17-6"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%XQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 2A m</span>
|
||
</span></code></pre></div>
|
||
<p>The above can be printed in an alternate version thanks to the <code>#</code> token:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-18-1"><a id="__codelineno-18-1" name="__codelineno-18-1" href="#__codelineno-18-1"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%#bQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 0b101010 m</span>
|
||
</span><span id="__span-18-2"><a id="__codelineno-18-2" name="__codelineno-18-2" href="#__codelineno-18-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%#BQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 0B101010 m</span>
|
||
</span><span id="__span-18-3"><a id="__codelineno-18-3" name="__codelineno-18-3" href="#__codelineno-18-3"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%#oQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 052 m</span>
|
||
</span><span id="__span-18-4"><a id="__codelineno-18-4" name="__codelineno-18-4" href="#__codelineno-18-4"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%#xQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 0x2a m</span>
|
||
</span><span id="__span-18-5"><a id="__codelineno-18-5" name="__codelineno-18-5" href="#__codelineno-18-5"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%#XQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 0X2A m</span>
|
||
</span></code></pre></div>
|
||
<p>For floating-point values, the <code>units-rep-type</code> token works as follows:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-19-1"><a id="__codelineno-19-1" name="__codelineno-19-1" href="#__codelineno-19-1"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%aQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 0x1.3c0ca2a5b1d5dp+0 m</span>
|
||
</span><span id="__span-19-2"><a id="__codelineno-19-2" name="__codelineno-19-2" href="#__codelineno-19-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.3aQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 0x1.3c1p+0 m</span>
|
||
</span><span id="__span-19-3"><a id="__codelineno-19-3" name="__codelineno-19-3" href="#__codelineno-19-3"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%AQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 0X1.3C0CA2A5B1D5DP+0 m</span>
|
||
</span><span id="__span-19-4"><a id="__codelineno-19-4" name="__codelineno-19-4" href="#__codelineno-19-4"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.3AQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 0X1.3C1P+0 m</span>
|
||
</span><span id="__span-19-5"><a id="__codelineno-19-5" name="__codelineno-19-5" href="#__codelineno-19-5"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%eQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.234568e+00 m</span>
|
||
</span><span id="__span-19-6"><a id="__codelineno-19-6" name="__codelineno-19-6" href="#__codelineno-19-6"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.3eQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.235e+00 m</span>
|
||
</span><span id="__span-19-7"><a id="__codelineno-19-7" name="__codelineno-19-7" href="#__codelineno-19-7"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%EQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.234568E+00 m</span>
|
||
</span><span id="__span-19-8"><a id="__codelineno-19-8" name="__codelineno-19-8" href="#__codelineno-19-8"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.3EQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.235E+00 m</span>
|
||
</span><span id="__span-19-9"><a id="__codelineno-19-9" name="__codelineno-19-9" href="#__codelineno-19-9"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%gQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23457 m</span>
|
||
</span><span id="__span-19-10"><a id="__codelineno-19-10" name="__codelineno-19-10" href="#__codelineno-19-10"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%gQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678e8</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23457e+08 m</span>
|
||
</span><span id="__span-19-11"><a id="__codelineno-19-11" name="__codelineno-19-11" href="#__codelineno-19-11"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.3gQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23 m</span>
|
||
</span><span id="__span-19-12"><a id="__codelineno-19-12" name="__codelineno-19-12" href="#__codelineno-19-12"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.3gQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678e8</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23e+08 m</span>
|
||
</span><span id="__span-19-13"><a id="__codelineno-19-13" name="__codelineno-19-13" href="#__codelineno-19-13"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%GQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23457 m</span>
|
||
</span><span id="__span-19-14"><a id="__codelineno-19-14" name="__codelineno-19-14" href="#__codelineno-19-14"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%GQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678e8</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23457E+08 m</span>
|
||
</span><span id="__span-19-15"><a id="__codelineno-19-15" name="__codelineno-19-15" href="#__codelineno-19-15"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.3GQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23 m</span>
|
||
</span><span id="__span-19-16"><a id="__codelineno-19-16" name="__codelineno-19-16" href="#__codelineno-19-16"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%.3GQ %q}"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2345678e8</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1.23E+08 m</span>
|
||
</span></code></pre></div>
|
||
<h4 id="unit-symbol-formatting">Unit symbol formatting<a class="headerlink" href="#unit-symbol-formatting" title="Permanent link">¶</a></h4>
|
||
<p>Unit symbols of some quantities are specified to use Unicode signs by the
|
||
<a href="../../../appendix/glossary/#si">SI</a> (e.g. <code>Ω</code> symbol for the resistance quantity). The <strong>mp-units</strong>
|
||
library follows this by default. From the engineering point of view, sometimes Unicode text might
|
||
not be the best solution as terminals of many (especially embedded) devices are ASCII-only.
|
||
In such a case, the unit symbol can be forced to be printed using ASCII-only characters thanks to
|
||
<code>units-text-encoding</code> token:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-20-1"><a id="__codelineno-20-1" name="__codelineno-20-1" href="#__codelineno-20-1"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{}"</span><span class="p">,</span><span class="w"> </span><span class="mi">10</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">si</span><span class="o">::</span><span class="n">ohm</span><span class="p">);</span><span class="w"> </span><span class="c1">// 10 Ω</span>
|
||
</span><span id="__span-20-2"><a id="__codelineno-20-2" name="__codelineno-20-2" href="#__codelineno-20-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %Aq}"</span><span class="p">,</span><span class="w"> </span><span class="mi">10</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">si</span><span class="o">::</span><span class="n">ohm</span><span class="p">);</span><span class="w"> </span><span class="c1">// 10 ohm</span>
|
||
</span><span id="__span-20-3"><a id="__codelineno-20-3" name="__codelineno-20-3" href="#__codelineno-20-3"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{}"</span><span class="p">,</span><span class="w"> </span><span class="mi">125</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">us</span><span class="p">);</span><span class="w"> </span><span class="c1">// 125 µs</span>
|
||
</span><span id="__span-20-4"><a id="__codelineno-20-4" name="__codelineno-20-4" href="#__codelineno-20-4"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %Aq}"</span><span class="p">,</span><span class="w"> </span><span class="mi">125</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">us</span><span class="p">);</span><span class="w"> </span><span class="c1">// 125 us</span>
|
||
</span><span id="__span-20-5"><a id="__codelineno-20-5" name="__codelineno-20-5" href="#__codelineno-20-5"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{}"</span><span class="p">,</span><span class="w"> </span><span class="mf">9.8</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="p">(</span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">));</span><span class="w"> </span><span class="c1">// 9.8 m/s²</span>
|
||
</span><span id="__span-20-6"><a id="__codelineno-20-6" name="__codelineno-20-6" href="#__codelineno-20-6"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %Aq}"</span><span class="p">,</span><span class="w"> </span><span class="mf">9.8</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="p">(</span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">));</span><span class="w"> </span><span class="c1">// 9.8 m/s^2</span>
|
||
</span></code></pre></div>
|
||
<p>Additionally, both <a href="../../../appendix/glossary/#isq">ISQ</a> and <a href="../../../appendix/glossary/#si">SI</a>
|
||
leave some freedom on how to print unit symbols. This is why two additional tokens were introduced.</p>
|
||
<p><code>units-unit-symbol-solidus</code> specifies how the division of units should look like. By default,
|
||
<code>/</code> will be used only when the denominator contains only one unit. However, with the <code>a</code> or <code>n</code>
|
||
options, we can force the facility to print the <code>/</code> character always (even when there are more units
|
||
in the denominator), or never in which case a parenthesis will be added to enclose all denominator
|
||
units.</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-21-1"><a id="__codelineno-21-1" name="__codelineno-21-1" href="#__codelineno-21-1"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 m/s</span>
|
||
</span><span id="__span-21-2"><a id="__codelineno-21-2" name="__codelineno-21-2" href="#__codelineno-21-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 kg m⁻¹ s⁻²</span>
|
||
</span><span id="__span-21-3"><a id="__codelineno-21-3" name="__codelineno-21-3" href="#__codelineno-21-3"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %aq}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 m/s</span>
|
||
</span><span id="__span-21-4"><a id="__codelineno-21-4" name="__codelineno-21-4" href="#__codelineno-21-4"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %aq}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 kg/(m s²)</span>
|
||
</span><span id="__span-21-5"><a id="__codelineno-21-5" name="__codelineno-21-5" href="#__codelineno-21-5"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %nq}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 m s⁻¹</span>
|
||
</span><span id="__span-21-6"><a id="__codelineno-21-6" name="__codelineno-21-6" href="#__codelineno-21-6"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %nq}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 kg m⁻¹ s⁻²</span>
|
||
</span></code></pre></div>
|
||
<p>Also, there are a few options to separate the units being multiplied:</p>
|
||
<div class="admonition quote">
|
||
<p class="admonition-title">ISO 80000-1</p>
|
||
<p>When symbols for quantities are combined in a product of two or more quantities, this combination
|
||
is indicated in one of the following ways: <code>ab</code>, <code>a b</code>, <code>a · b</code>, <code>a × b</code></p>
|
||
<p><em>NOTE 1</em> In some fields, e.g., vector algebra, distinction is made between <code>a ∙ b</code> and <code>a × b</code>.</p>
|
||
</div>
|
||
<p>As of today, the <strong>mp-units</strong> library provides the support for <code>a b</code> and <code>a · b</code> only. Additionally,
|
||
we decided that the extraneous space in the latter case makes the result too verbose, so we decided
|
||
to just use the <code>·</code> symbol as a separator.</p>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>Please let us know in case you require more formatting options here.</p>
|
||
</div>
|
||
<p>The <code>units-unit-symbol-separator</code> token allows us to obtain the following outputs:</p>
|
||
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-22-1"><a id="__codelineno-22-1" name="__codelineno-22-1" href="#__codelineno-22-1"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %q}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m2</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 kg m²/s²</span>
|
||
</span><span id="__span-22-2"><a id="__codelineno-22-2" name="__codelineno-22-2" href="#__codelineno-22-2"></a><span class="n">std</span><span class="o">::</span><span class="n">println</span><span class="p">(</span><span class="s">"{:%Q %dq}"</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m2</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s2</span><span class="p">);</span><span class="w"> </span><span class="c1">// 1 kg⋅m²/s²</span>
|
||
</span></code></pre></div>
|
||
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