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<h1 id="installation-and-usage">Installation And Usage<a class="headerlink" href="#installation-and-usage" title="Permanent link">&para;</a></h1>
<p>This chapter provides all the necessary information to obtain <strong>mp-units</strong> and build the user's
source code using it.</p>
<h2 id="obtaining-dependencies">Obtaining dependencies<a class="headerlink" href="#obtaining-dependencies" title="Permanent link">&para;</a></h2>
<p>This library assumes that most of the dependencies will be provided by the
<a href="https://conan.io/">Conan Package Manager</a>. If you want to obtain required
dependencies by other means, some modifications to the library's CMake files might be needed.</p>
<details class="info">
<summary>Conan quick intro</summary>
<p>In case you are not familiar with Conan, to install it (or upgrade) just do:</p>
<div class="language-shell highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>pip<span class="w"> </span>install<span class="w"> </span>-U<span class="w"> </span>conan
</span></code></pre></div>
<p>After that, you might need to add a custom profile file for your development environment
in <em>~/.conan2/profiles</em> directory. An example profile can look as follows:</p>
<div class="language-ini highlight"><span class="filename">~/.conan2/profiles/gcc12</span><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">[settings]</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="na">arch</span><span class="o">=</span><span class="s">x86_64</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="na">build_type</span><span class="o">=</span><span class="s">Release</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="na">compiler</span><span class="o">=</span><span class="s">gcc</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="hll"><span class="na">compiler.cppstd</span><span class="o">=</span><span class="s">20</span>
</span></span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="na">compiler.libcxx</span><span class="o">=</span><span class="s">libstdc++11</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="na">compiler.version</span><span class="o">=</span><span class="s">14</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="na">os</span><span class="o">=</span><span class="s">Linux</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="k">[conf]</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="na">tools.build</span><span class="o">:</span><span class="s">compiler_executables={&quot;c&quot;: &quot;gcc-14&quot;, &quot;cpp&quot;: &quot;g++-14&quot;}</span>
</span></code></pre></div>
<div class="admonition tip">
<p class="admonition-title">Setting the language version</p>
<p>Please note that the <strong>mp-units</strong> library requires at least C++20 to be set in a Conan profile
or forced via the Conan command line. If we do the former, we will not need to provide
<code>-s compiler.cppstd=20</code> every time we run a Conan command line (as provided in the command
line instructions below).</p>
</div>
<div class="admonition tip">
<p class="admonition-title">Using Ninja as a CMake generator for Conan</p>
<p>It is highly recommended to set Ninja as a CMake generator for Conan. To do so, we could
create a <em>~/.conan2/global.conf</em> file that will set <code>tools.cmake.cmaketoolchain:generator</code>
to one of the Ninja generators. For example:</p>
<div class="language-text highlight"><span class="filename">~/.conan2/global.conf</span><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>tools.cmake.cmaketoolchain:generator=&quot;Ninja Multi-Config&quot;
</span></code></pre></div>
</div>
<div class="admonition tip">
<p class="admonition-title">Separate build folders for different configurations</p>
<p><em>~/.conan2/global.conf</em> file may also set <code>tools.cmake.cmake_layout:build_folder_vars</code> which
<a href="https://docs.conan.io/2/reference/tools/cmake/cmake_layout.html#multi-setting-option-cmake-layout">makes working with several compilers or build configurations easier</a>.
For example, the below line will force Conan to generate separate CMake presets and folders for
each compiler and C++ standard version:</p>
<div class="language-text highlight"><span class="filename">~/.conan2/global.conf</span><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>tools.cmake.cmake_layout:build_folder_vars=[&quot;settings.compiler&quot;, &quot;settings.compiler.version&quot;, &quot;settings.compiler.cppstd&quot;]
</span></code></pre></div>
<p>In such a case, we will need to use a configuration-specific preset name in the Conan instructions
provided below rather than just <code>conan-default</code> and <code>conan-release</code>
(e.g., <code>conan-gcc-13-23</code> and <code>conan-gcc-13-23-release</code>)</p>
</div>
</details>
<details class="info">
<summary>CMake with presets support</summary>
<p>It is recommended to use at least CMake 3.23 to build this project to benefit from CMake Presets
generated by Conan. All build instructions below assume that you have such support. If not,
your CMake invocations have to be replaced with something like:</p>
<div class="language-shell highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>mkdir<span class="w"> </span>build<span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="nb">cd</span><span class="w"> </span>build
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>cmake<span class="w"> </span>..<span class="w"> </span>-G<span class="w"> </span><span class="s2">&quot;Ninja Multi-Config&quot;</span><span class="w"> </span>-DCMAKE_TOOLCHAIN_FILE<span class="o">=</span>&lt;path_to_generators_dir&gt;/conan_toolchain.cmake
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a>cmake<span class="w"> </span>--build<span class="w"> </span>.<span class="w"> </span>--config<span class="w"> </span>Release
</span></code></pre></div>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>In case you can't use CMake 3.23 but you have access to CMake 3.20 or later, you can append
<code>-c tools.cmake.cmaketoolchain.presets:max_schema_version=2</code> to the <code>conan install</code> command
which will force Conan to use an older version of the CMake Presets schema.</p>
</div>
</details>
<h2 id="build-options">Build options<a class="headerlink" href="#build-options" title="Permanent link">&para;</a></h2>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Most of the below options are related to the C++ language features available in the compilers.
Please refer to the <a href="../cpp_compiler_support/">C++ compiler support</a> chapter to learn more
about which C++ features are required for each option and which compilers support them.</p>
</div>
<h3 id="conan-options">Conan options<a class="headerlink" href="#conan-options" title="Permanent link">&para;</a></h3>
<dl>
<dt><a href="#cxx_modules" id="cxx_modules"><code>cxx_modules</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>True</code>/<code>False</code> (Default: automatically determined from settings)</p>
<p>Configures CMake to add C++ modules to the list of default targets.</p>
</dd>
<dt><a href="#import_std" id="import_std"><code>import_std</code></a> <img alt="🧪" class="twemoji" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f9ea.svg" title="Experimental" /></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.3.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.3.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>True</code>/<code>False</code> (Default: automatically determined from settings)</p>
<p>Enables <code>import std;</code> usage.</p>
</dd>
<dt><a href="#std_format" id="std_format"><code>std_format</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>True</code>/<code>False</code> (Default: automatically determined from settings)</p>
<p>Enables the usage of <a href="https://en.cppreference.com/w/cpp/utility/format/format"><code>std::format</code></a>
and associated facilities for text formatting. If it is not supported, then
the <a href="https://github.com/fmtlib/fmt">{fmt}</a> library is used instead.</p>
</dd>
<dt><a href="#string_view_ret" id="string_view_ret"><code>string_view_ret</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>True</code>/<code>False</code> (Default: automatically determined from settings)</p>
<p>Enables returning <code>std::string_view</code> from the
<a href="../../users_guide/framework_basics/text_output/#unit_symbol"><code>unit_symbol()</code></a>
and <a href="../../users_guide/framework_basics/text_output/#dimension_symbol"><code>dimension_symbol()</code></a>
functions. If this feature is not available, those functions will return
<code>mp_units::basic_fixed_string&lt;CharT, N&gt;</code> instead.</p>
</dd>
<dt><a href="#no_crtp" id="no_crtp"><code>no_crtp</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>True</code>/<code>False</code> (Default: automatically determined from settings)</p>
<p>Removes the need for the usage of the CRTP idiom in the
<a href="../../users_guide/framework_basics/systems_of_quantities/#defining-quantities"><code>quantity_spec</code> definitions</a>.</p>
</dd>
<dt><a href="#contracts" id="contracts"><code>contracts</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>none</code>/<code>gsl-lite</code>/<code>ms-gsl</code> (Default: <code>gsl-lite</code>)</p>
<p>Enables checking of preconditions and additional asserts in the code.</p>
</dd>
<dt><a href="#freestanding" id="freestanding"><code>freestanding</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>True</code>/<code>False</code> (Default: <code>False</code>)</p>
<p>Configures the library in the <a href="https://en.cppreference.com/w/cpp/freestanding">freestanding</a>
mode. When enabled, the library's source code will build with the compiler's
<a href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html"><code>-ffreestanding</code></a> compilation option
without any issues.</p>
</dd>
</dl>
<details class="info">
<summary>CMake options to set when Conan is not being used</summary>
<h3 id="cmake-options">CMake options<a class="headerlink" href="#cmake-options" title="Permanent link">&para;</a></h3>
<p>Conan will automatically set all the below CMake options based on its configuration (described above).
Manual setting of the below CMake options is only needed when Conan is not being used.</p>
<dl>
<dt><a href="#MP_UNITS_BUILD_AS_SYSTEM_HEADERS" id="MP_UNITS_BUILD_AS_SYSTEM_HEADERS"><code>MP_UNITS_BUILD_AS_SYSTEM_HEADERS</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>ON</code>/<code>OFF</code> (Default: <code>OFF</code>)</p>
<p>Exports library as system headers.</p>
</dd>
<dt><a href="#MP_UNITS_BUILD_CXX_MODULES" id="MP_UNITS_BUILD_CXX_MODULES"><code>MP_UNITS_BUILD_CXX_MODULES</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>ON</code>/<code>OFF</code> (Default: <code>OFF</code>)</p>
<p>Adds C++ modules to the list of default targets.</p>
</dd>
<dt><a href="#MP_UNITS_API_STD_FORMAT" id="MP_UNITS_API_STD_FORMAT"><code>MP_UNITS_API_STD_FORMAT</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>ON</code>/<code>OFF</code> (Default: automatically determined)</p>
<p>Enables the usage of <a href="https://en.cppreference.com/w/cpp/utility/format/format"><code>std::format</code></a>
and associated facilities for text formatting. If it is not supported, then
the <a href="https://github.com/fmtlib/fmt">{fmt}</a> library is used instead.</p>
</dd>
<dt><a href="#MP_UNITS_API_STRING_VIEW_RET" id="MP_UNITS_API_STRING_VIEW_RET"><code>MP_UNITS_API_STRING_VIEW_RET</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>ON</code>/<code>OFF</code> (Default: automatically determined)</p>
<p>Enables returning <code>std::string_view</code> from the
<a href="../../users_guide/framework_basics/text_output/#unit_symbol"><code>unit_symbol()</code></a>
and <a href="../../users_guide/framework_basics/text_output/#dimension_symbol"><code>dimension_symbol()</code></a>
functions. If this feature is not available, those functions will return
<code>mp_units::basic_fixed_string&lt;CharT, N&gt;</code> instead.</p>
</dd>
<dt><a href="#MP_UNITS_API_NO_CRTP" id="MP_UNITS_API_NO_CRTP"><code>MP_UNITS_API_NO_CRTP</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>ON</code>/<code>OFF</code> (Default: automatically determined)</p>
<p>Removes the need for the usage of the CRTP idiom in the
<a href="../../users_guide/framework_basics/systems_of_quantities/#defining-quantities"><code>quantity_spec</code> definitions</a>.</p>
</dd>
<dt><a href="#MP_UNITS_API_CONTRACTS" id="MP_UNITS_API_CONTRACTS"><code>MP_UNITS_API_CONTRACTS</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>NONE</code>/<code>GSL-LITE</code>/<code>MS-GSL</code> (Default: <code>GSL-LITE</code>)</p>
<p>Enables checking of preconditions and additional asserts in the code.</p>
</dd>
<dt><a href="#MP_UNITS_API_FREESTANDING" id="MP_UNITS_API_FREESTANDING"><code>MP_UNITS_API_FREESTANDING</code></a></dt>
<dd>
<p><a href="https://github.com/mpusz/mp-units/releases/tag/v2.2.0"><span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7.75 6.5a1.25 1.25 0 1 0 0 2.5 1.25 1.25 0 0 0 0-2.5"/><path d="M2.5 1h8.44a1.5 1.5 0 0 1 1.06.44l10.25 10.25a1.5 1.5 0 0 1 0 2.12l-8.44 8.44a1.5 1.5 0 0 1-2.12 0L1.44 12A1.5 1.5 0 0 1 1 10.94V2.5A1.5 1.5 0 0 1 2.5 1m0 1.5v8.44l10.25 10.25 8.44-8.44L10.94 2.5Z"/></svg></span> 2.2.0</a> · <span class="twemoji"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M11.75 1a.75.75 0 0 1 .75.75V4h6.532c.42 0 .826.15 1.143.425l3.187 2.75a1.75 1.75 0 0 1 0 2.65l-3.187 2.75a1.75 1.75 0 0 1-1.143.425H12.5v9.25a.75.75 0 0 1-1.5 0V13H3.75A1.75 1.75 0 0 1 2 11.25v-5.5C2 4.783 2.784 4 3.75 4H11V1.75a.75.75 0 0 1 .75-.75m7.282 4.5H3.75a.25.25 0 0 0-.25.25v5.5c0 .138.112.25.25.25h15.282c.06 0 .118-.021.163-.06l3.188-2.75a.248.248 0 0 0 0-.38l-3.188-2.75a.25.25 0 0 0-.163-.06"/></svg></span> <code>ON</code>/<code>OFF</code> (Default: <code>OFF</code>)</p>
<p>Configures the library in the <a href="https://en.cppreference.com/w/cpp/freestanding">freestanding</a>
mode. When enabled, the library's source code should build with the compiler's
<a href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html"><code>-ffreestanding</code></a> compilation option
without any issues.</p>
</dd>
</dl>
</details>
<h2 id="installation-and-reuse">Installation and reuse<a class="headerlink" href="#installation-and-reuse" title="Permanent link">&para;</a></h2>
<p>There are many different ways of installing/reusing <strong>mp-units</strong> in your project. Below we mention
only a few of many options possible.</p>
<div class="admonition important">
<p class="admonition-title">Important: Prefer using Conan if possible</p>
<p>The easiest and most recommended way to obtain <strong>mp-units</strong> is with the Conan package manager.
See <a href="#conan-cmake-release">Conan + CMake (release)</a> for a detailed instruction.</p>
</div>
<h3 id="conan-cmake-release">Conan + CMake (release)<a class="headerlink" href="#conan-cmake-release" title="Permanent link">&para;</a></h3>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>If you are new to the Conan package manager you may want to read
<a href="#obtaining-dependencies">Obtaining Dependencies</a> and refer to the
<a href="https://docs.conan.io/2/tutorial/consuming_packages.html">Consuming packages</a>
chapter of the official Conan documentation for more information.</p>
</div>
<p><strong>mp-units</strong> releases are hosted on <a href="https://conan.io/center/recipes/mp-units">Conan-Center</a>.
The following steps may be performed to obtain an official library release:</p>
<ol>
<li>
<p>Create Conan configuration file (either <em>conanfile.txt</em> or <em>conanfile.py</em>) in your
project's top-level directory and add <strong>mp-units</strong> as a dependency of your project.
For example, the simplest file may look as follows:</p>
<div class="language-ini highlight"><span class="filename">conanfile.txt</span><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">[requires]</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="na">mp-units/2.3.0</span>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a>
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="k">[options]</span>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a>
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="k">[layout]</span>
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a><span class="na">cmake_layout</span>
</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a>
</span><span id="__span-5-9"><a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a><span class="k">[generators]</span>
</span><span id="__span-5-10"><a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a><span class="na">CMakeToolchain</span>
</span><span id="__span-5-11"><a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a><span class="na">CMakeDeps</span>
</span></code></pre></div>
</li>
<li>
<p>Import <strong>mp-units</strong> and its dependencies definitions with <code>find_package</code>:</p>
<div class="language-cmake 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="nb">find_package</span><span class="p">(</span><span class="s">mp-units</span><span class="w"> </span><span class="s">REQUIRED</span><span class="p">)</span>
</span></code></pre></div>
</li>
<li>
<p>Link your CMake targets with <strong>mp-units</strong>:</p>
<div class="language-cmake 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="nb">target_link_libraries</span><span class="p">(</span><span class="s">&lt;your_target&gt;</span><span class="w"> </span><span class="s">&lt;PUBLIC|PRIVATE|INTERFACE&gt;</span><span class="w"> </span><span class="s">mp-units::mp-units</span><span class="p">)</span>
</span></code></pre></div>
</li>
<li>
<p>Download, build, and install Conan dependencies before running the CMake configuration step:</p>
<div class="language-shell highlight"><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a>conan<span class="w"> </span>install<span class="w"> </span>.<span class="w"> </span>-pr<span class="w"> </span>&lt;your_conan_profile&gt;<span class="w"> </span>-s<span class="w"> </span>compiler.cppstd<span class="o">=</span><span class="m">20</span><span class="w"> </span>-b<span class="o">=</span>missing
</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a>cmake<span class="w"> </span>--preset<span class="w"> </span>conan-default
</span><span id="__span-8-3"><a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a>cmake<span class="w"> </span>--build<span class="w"> </span>--preset<span class="w"> </span>conan-release
</span></code></pre></div>
</li>
</ol>
<h3 id="conan-cmake-live-at-head">Conan + CMake (Live At Head)<a class="headerlink" href="#conan-cmake-live-at-head" title="Permanent link">&para;</a></h3>
<p>This chapter describes the procedure to Live At Head, which means using the latest stable version
of <strong>mp-units</strong> all the time.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Please note that even though the Conan packages that you will be using are generated <strong>ONLY</strong>
for builds that are considered stable (passed our CI tests), some minor regressions may happen
(CI and C++ build environments are not perfect yet). Also, please expect that the library
interface might, and probably will, change occasionally. Even though we do our best, such
changes might not be reflected in the project's documentation right away.</p>
</div>
<p>The procedure is similar to the one described in <a href="#conan-cmake-release">Conan + CMake (release)</a>
with the following differences:</p>
<ol>
<li>
<p>Before starting the previous procedure, add <strong>mp-units</strong> remote to your Conan configuration:</p>
<div class="language-shell highlight"><pre><span></span><code><span id="__span-9-1"><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a>conan<span class="w"> </span>remote<span class="w"> </span>add<span class="w"> </span>conan-mpusz<span class="w"> </span>https://mpusz.jfrog.io/artifactory/api/conan/conan-oss
</span></code></pre></div>
</li>
<li>
<p>In your Conan configuration file, provide the package identifier of the <code>mpusz/testing</code> stream:</p>
<div class="language-ini highlight"><span class="filename">conanfile.txt</span><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">[requires]</span>
</span><span id="__span-10-2"><a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="hll"><span class="na">mp-units/2.4.0@mpusz/testing</span>
</span></span><span id="__span-10-3"><a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a>
</span><span id="__span-10-4"><a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a><span class="k">[options]</span>
</span><span id="__span-10-5"><a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a>
</span><span id="__span-10-6"><a id="__codelineno-10-6" name="__codelineno-10-6" href="#__codelineno-10-6"></a><span class="k">[layout]</span>
</span><span id="__span-10-7"><a id="__codelineno-10-7" name="__codelineno-10-7" href="#__codelineno-10-7"></a><span class="na">cmake_layout</span>
</span><span id="__span-10-8"><a id="__codelineno-10-8" name="__codelineno-10-8" href="#__codelineno-10-8"></a>
</span><span id="__span-10-9"><a id="__codelineno-10-9" name="__codelineno-10-9" href="#__codelineno-10-9"></a><span class="k">[generators]</span>
</span><span id="__span-10-10"><a id="__codelineno-10-10" name="__codelineno-10-10" href="#__codelineno-10-10"></a><span class="na">CMakeToolchain</span>
</span><span id="__span-10-11"><a id="__codelineno-10-11" name="__codelineno-10-11" href="#__codelineno-10-11"></a><span class="na">CMakeDeps</span>
</span></code></pre></div>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>The identifiers of the latest packages can always be found in
<a href="https://github.com/mpusz/mp-units/blob/master/README.md">the project's README file</a> or on
<a href="https://mpusz.jfrog.io/ui/packages/conan:%2F%2Fmp-units">the project's Artifactory</a>.</p>
</div>
</li>
<li>
<p>Force Conan to check for updated recipes with <code>-u</code>:</p>
<div class="language-shell highlight"><pre><span></span><code><span id="__span-11-1"><a id="__codelineno-11-1" name="__codelineno-11-1" href="#__codelineno-11-1"></a>conan<span class="w"> </span>install<span class="w"> </span>.<span class="w"> </span>-pr<span class="w"> </span>&lt;your_conan_profile&gt;<span class="w"> </span>-s<span class="w"> </span>compiler.cppstd<span class="o">=</span><span class="m">20</span><span class="w"> </span>-b<span class="o">=</span>missing<span class="w"> </span>-u
</span></code></pre></div>
</li>
</ol>
<details class="info">
<summary>Alternative installation scenarios</summary>
<h3 id="copy">Copy<a class="headerlink" href="#copy" title="Permanent link">&para;</a></h3>
<p>As <strong>mp-units</strong> is a C++ header-only library you can simply copy all needed <em>src/*/include</em> subdirectories
to your source tree.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>In such a case, you are on your own to ensure all the dependencies are installed and their header
files can be located during the build. Please also note that some compiler-specific flags are needed
to make the code compile without issues.</p>
</div>
<h3 id="copy-cmake">Copy + CMake<a class="headerlink" href="#copy-cmake" title="Permanent link">&para;</a></h3>
<p>If you copy the <strong>mp-units</strong> library source code from <strong>the project's <em>./src</em> directory</strong>
(not the entire repo from its root), you can reuse CMake targets defined by the library.
To do so, <strong>you should use <em>CMakeLists.txt</em> file from the <em>./src</em> directory</strong>:</p>
<div class="language-cmake 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="nb">add_subdirectory</span><span class="p">(</span><span class="s">&lt;path_to_mp_units_lib_folder&gt;</span><span class="p">)</span>
</span><span id="__span-12-2"><a id="__codelineno-12-2" name="__codelineno-12-2" href="#__codelineno-12-2"></a><span class="c"># ...</span>
</span><span id="__span-12-3"><a id="__codelineno-12-3" name="__codelineno-12-3" href="#__codelineno-12-3"></a><span class="nb">target_link_libraries</span><span class="p">(</span><span class="s">&lt;your_target&gt;</span><span class="w"> </span><span class="s">&lt;PUBLIC|PRIVATE|INTERFACE&gt;</span><span class="w"> </span><span class="s">mp-units::mp-units</span><span class="p">)</span>
</span></code></pre></div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You are still on your own to make sure all the dependencies are installed and their header and CMake
configuration files can be located during the build.</p>
</div>
<div class="admonition important">
<p class="admonition-title">Important: Library users should not use the top-level CMake file</p>
<p>Top level <em>CMakeLists.txt</em> file should only be used by <strong>mp-units developers and contributors</strong>
as an entry point for the project's development.
<em>./src/CMakeLists.txt</em> contains only a pure library definition and <strong>should be used by the
customers</strong> that prefer to use CMake's
<a href="https://cmake.org/cmake/help/latest/command/add_subdirectory.html"><code>add_subdirectory()</code></a> to
handle the dependencies.</p>
<p>To learn more about the rationale, please check our
<a href="../faq/#why-dont-we-have-cmake-options-to-disable-the-building-of-tests-and-examples">FAQ</a>.</p>
</div>
<h3 id="install">Install<a class="headerlink" href="#install" title="Permanent link">&para;</a></h3>
<p>If you don't want to use Conan in your project and just want to install the <strong>mp-units</strong>
library on your file system, and use <code>find_package(mp-units)</code> from another repository to find it;
it is enough to perform the following steps:</p>
<div class="language-shell highlight"><pre><span></span><code><span id="__span-13-1"><a id="__codelineno-13-1" name="__codelineno-13-1" href="#__codelineno-13-1"></a>conan<span class="w"> </span>install<span class="w"> </span>.<span class="w"> </span>-pr<span class="w"> </span>&lt;your_conan_profile&gt;<span class="w"> </span>-s<span class="w"> </span>compiler.cppstd<span class="o">=</span><span class="m">20</span><span class="w"> </span>-b<span class="o">=</span>missing
</span><span id="__span-13-2"><a id="__codelineno-13-2" name="__codelineno-13-2" href="#__codelineno-13-2"></a>mv<span class="w"> </span>CMakeUserPresets.json<span class="w"> </span>src
</span><span id="__span-13-3"><a id="__codelineno-13-3" name="__codelineno-13-3" href="#__codelineno-13-3"></a><span class="nb">cd</span><span class="w"> </span>src
</span><span id="__span-13-4"><a id="__codelineno-13-4" name="__codelineno-13-4" href="#__codelineno-13-4"></a>cmake<span class="w"> </span>--preset<span class="w"> </span>conan-default<span class="w"> </span>-DCMAKE_INSTALL_PREFIX<span class="o">=</span>&lt;your_installation_path&gt;
</span><span id="__span-13-5"><a id="__codelineno-13-5" name="__codelineno-13-5" href="#__codelineno-13-5"></a>cmake<span class="w"> </span>--build<span class="w"> </span>--preset<span class="w"> </span>conan-release<span class="w"> </span>--target<span class="w"> </span>install
</span></code></pre></div>
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