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<h1 id="avg_speed"><code>avg_speed</code><a class="headerlink" href="#avg_speed" title="Permanent link">¶</a></h1>
|
|
<div class="admonition example">
|
|
<p class="admonition-title"><a href="https://godbolt.org/z/v9c5T6bc4">Try it on Compiler Explorer</a></p>
|
|
</div>
|
|
<p>Let's continue the previous example. This time, our purpose will not be to showcase as many
|
|
library features as possible, but we will scope on different interfaces one can provide
|
|
with the <strong>mp-units</strong>. We will also describe some advantages and disadvantages of presented
|
|
solutions.</p>
|
|
<p>First, we either import a module or include all the necessary header files and import all
|
|
the identifiers from the <code>mp_units</code> namespace:</p>
|
|
<div class="language-cpp highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">avg_speed.cpp</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-9"> 9</a></span>
|
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<span class="normal"><a href="#__codelineno-0-10">10</a></span>
|
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<span class="normal"><a href="#__codelineno-0-11">11</a></span>
|
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<span class="normal"><a href="#__codelineno-0-12">12</a></span>
|
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<span class="normal"><a href="#__codelineno-0-13">13</a></span>
|
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<span class="normal"><a href="#__codelineno-0-14">14</a></span>
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<span class="normal"><a href="#__codelineno-0-15">15</a></span>
|
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<span class="normal"><a href="#__codelineno-0-16">16</a></span>
|
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<span class="normal"><a href="#__codelineno-0-17">17</a></span>
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<span class="normal"><a href="#__codelineno-0-18">18</a></span>
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<span class="normal"><a href="#__codelineno-0-19">19</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="cp">#ifdef MP_UNITS_IMPORT_STD</span>
|
|
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></a><span class="k">import</span><span class="w"> </span><span class="n">std</span><span class="p">;</span>
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</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3"></a><span class="cp">#else</span>
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</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4"></a><span class="cp">#include</span><span class="w"> </span><span class="cpf"><exception></span>
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|
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5"></a><span class="cp">#include</span><span class="w"> </span><span class="cpf"><iostream></span>
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|
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6"></a><span class="cp">#endif</span>
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</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7"></a><span class="cp">#ifdef MP_UNITS_MODULES</span>
|
|
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8"></a><span class="k">import</span><span class="w"> </span><span class="n">mp_units</span><span class="p">;</span>
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</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9"></a><span class="cp">#else</span>
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</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10"></a><span class="cp">#include</span><span class="w"> </span><span class="cpf"><mp-units/ostream.h></span>
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</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11"></a><span class="cp">#include</span><span class="w"> </span><span class="cpf"><mp-units/systems/cgs.h></span>
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|
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12"></a><span class="cp">#include</span><span class="w"> </span><span class="cpf"><mp-units/systems/international.h></span>
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|
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13"></a><span class="cp">#include</span><span class="w"> </span><span class="cpf"><mp-units/systems/isq.h></span>
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|
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14"></a><span class="cp">#include</span><span class="w"> </span><span class="cpf"><mp-units/systems/si.h></span>
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|
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15"></a><span class="cp">#endif</span>
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</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16"></a>
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|
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17"></a><span class="k">namespace</span><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18"></a>
|
|
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19"></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></code></pre></div></td></tr></table></div>
|
|
<p>Next, we define two functions calculating average speed based on quantities of fixed units
|
|
and integral and floating-point representation types, respectively, and a third function
|
|
that we introduced in the <a href="../hello_units/">previous example</a>:</p>
|
|
<div class="language-cpp highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">avg_speed.cpp</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-20">20</a></span>
|
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<span class="normal"><a href="#__codelineno-1-21">21</a></span>
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<span class="normal"><a href="#__codelineno-1-22">22</a></span>
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<span class="normal"><a href="#__codelineno-1-23">23</a></span>
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<span class="normal"><a href="#__codelineno-1-24">24</a></span>
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<span class="normal"><a href="#__codelineno-1-25">25</a></span>
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<span class="normal"><a href="#__codelineno-1-26">26</a></span>
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<span class="normal"><a href="#__codelineno-1-27">27</a></span>
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<span class="normal"><a href="#__codelineno-1-28">28</a></span>
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<span class="normal"><a href="#__codelineno-1-29">29</a></span>
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<span class="normal"><a href="#__codelineno-1-30">30</a></span>
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<span class="normal"><a href="#__codelineno-1-31">31</a></span>
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<span class="normal"><a href="#__codelineno-1-32">32</a></span>
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<span class="normal"><a href="#__codelineno-1-33">33</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-34">34</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-1-20"><a id="__codelineno-1-20" name="__codelineno-1-20"></a><span class="k">constexpr</span><span class="w"> </span><span class="n">quantity</span><span class="o"><</span><span class="n">si</span><span class="o">::</span><span class="n">metre</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">second</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">fixed_int_si_avg_speed</span><span class="p">(</span><span class="n">quantity</span><span class="o"><</span><span class="n">si</span><span class="o">::</span><span class="n">metre</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">d</span><span class="p">,</span>
|
|
</span><span id="__span-1-21"><a id="__codelineno-1-21" name="__codelineno-1-21"></a><span class="w"> </span><span class="n">quantity</span><span class="o"><</span><span class="n">si</span><span class="o">::</span><span class="n">second</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">t</span><span class="p">)</span>
|
|
</span><span id="__span-1-22"><a id="__codelineno-1-22" name="__codelineno-1-22"></a><span class="p">{</span>
|
|
</span><span id="__span-1-23"><a id="__codelineno-1-23" name="__codelineno-1-23"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">t</span><span class="p">;</span>
|
|
</span><span id="__span-1-24"><a id="__codelineno-1-24" name="__codelineno-1-24"></a><span class="p">}</span>
|
|
</span><span id="__span-1-25"><a id="__codelineno-1-25" name="__codelineno-1-25"></a>
|
|
</span><span id="__span-1-26"><a id="__codelineno-1-26" name="__codelineno-1-26"></a><span class="k">constexpr</span><span class="w"> </span><span class="n">quantity</span><span class="o"><</span><span class="n">si</span><span class="o">::</span><span class="n">metre</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">second</span><span class="o">></span><span class="w"> </span><span class="n">fixed_double_si_avg_speed</span><span class="p">(</span><span class="n">quantity</span><span class="o"><</span><span class="n">si</span><span class="o">::</span><span class="n">metre</span><span class="o">></span><span class="w"> </span><span class="n">d</span><span class="p">,</span><span class="w"> </span><span class="n">quantity</span><span class="o"><</span><span class="n">si</span><span class="o">::</span><span class="n">second</span><span class="o">></span><span class="w"> </span><span class="n">t</span><span class="p">)</span>
|
|
</span><span id="__span-1-27"><a id="__codelineno-1-27" name="__codelineno-1-27"></a><span class="p">{</span>
|
|
</span><span id="__span-1-28"><a id="__codelineno-1-28" name="__codelineno-1-28"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">t</span><span class="p">;</span>
|
|
</span><span id="__span-1-29"><a id="__codelineno-1-29" name="__codelineno-1-29"></a><span class="p">}</span>
|
|
</span><span id="__span-1-30"><a id="__codelineno-1-30" name="__codelineno-1-30"></a>
|
|
</span><span id="__span-1-31"><a id="__codelineno-1-31" name="__codelineno-1-31"></a><span class="k">constexpr</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">avg_speed</span><span class="p">(</span><span class="n">QuantityOf</span><span class="o"><</span><span class="n">isq</span><span class="o">::</span><span class="n">length</span><span class="o">></span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">d</span><span class="p">,</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">time</span><span class="o">></span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">t</span><span class="p">)</span>
|
|
</span><span id="__span-1-32"><a id="__codelineno-1-32" name="__codelineno-1-32"></a><span class="p">{</span>
|
|
</span><span id="__span-1-33"><a id="__codelineno-1-33" name="__codelineno-1-33"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">t</span><span class="p">;</span>
|
|
</span><span id="__span-1-34"><a id="__codelineno-1-34" name="__codelineno-1-34"></a><span class="p">}</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<p>We also added a simple utility to print our results:</p>
|
|
<div class="language-cpp highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">avg_speed.cpp</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-2-35">35</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-36">36</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-37">37</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-38">38</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-39">39</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-40">40</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-41">41</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-2-35"><a id="__codelineno-2-35" name="__codelineno-2-35"></a><span class="k">template</span><span class="o"><</span><span class="n">QuantityOf</span><span class="o"><</span><span class="n">isq</span><span class="o">::</span><span class="n">length</span><span class="o">></span><span class="w"> </span><span class="n">D</span><span class="p">,</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">time</span><span class="o">></span><span class="w"> </span><span class="n">T</span><span class="p">,</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="n">V</span><span class="o">></span>
|
|
</span><span id="__span-2-36"><a id="__codelineno-2-36" name="__codelineno-2-36"></a><span class="kt">void</span><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">D</span><span class="w"> </span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">V</span><span class="w"> </span><span class="n">speed</span><span class="p">)</span>
|
|
</span><span id="__span-2-37"><a id="__codelineno-2-37" name="__codelineno-2-37"></a><span class="p">{</span>
|
|
</span><span id="__span-2-38"><a id="__codelineno-2-38" name="__codelineno-2-38"></a><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">result_in_kmph</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">speed</span><span class="p">.</span><span class="n">force_in</span><span class="p">(</span><span class="n">si</span><span class="o">::</span><span class="n">kilo</span><span class="o"><</span><span class="n">si</span><span class="o">::</span><span class="n">metre</span><span class="o">></span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">non_si</span><span class="o">::</span><span class="n">hour</span><span class="p">);</span>
|
|
</span><span id="__span-2-39"><a id="__codelineno-2-39" name="__codelineno-2-39"></a><span class="w"> </span><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">"Average speed of a car that makes "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">distance</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" in "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">duration</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" is "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">result_in_kmph</span>
|
|
</span><span id="__span-2-40"><a id="__codelineno-2-40" name="__codelineno-2-40"></a><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-2-41"><a id="__codelineno-2-41" name="__codelineno-2-41"></a><span class="p">}</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<p>Now, let's analyze how those three utility functions behave with different sets of arguments.
|
|
First, we are going to use quantities of SI units and integral representation:</p>
|
|
<div class="language-cpp highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">avg_speed.cpp</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-3-42">42</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-43">43</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-44">44</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-45">45</a></span>
|
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<span class="normal"><a href="#__codelineno-3-46">46</a></span>
|
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<span class="normal"><a href="#__codelineno-3-47">47</a></span>
|
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<span class="normal"><a href="#__codelineno-3-48">48</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-49">49</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-50">50</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-51">51</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-52">52</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-53">53</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-54">54</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-55">55</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-56">56</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-3-42"><a id="__codelineno-3-42" name="__codelineno-3-42"></a><span class="kt">void</span><span class="w"> </span><span class="nf">example</span><span class="p">()</span>
|
|
</span><span id="__span-3-43"><a id="__codelineno-3-43" name="__codelineno-3-43"></a><span class="p">{</span>
|
|
</span><span id="__span-3-44"><a id="__codelineno-3-44" name="__codelineno-3-44"></a><span class="w"> </span><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-3-45"><a id="__codelineno-3-45" name="__codelineno-3-45"></a>
|
|
</span><span id="__span-3-46"><a id="__codelineno-3-46" name="__codelineno-3-46"></a><span class="w"> </span><span class="c1">// SI (int)</span>
|
|
</span><span id="__span-3-47"><a id="__codelineno-3-47" name="__codelineno-3-47"></a><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-3-48"><a id="__codelineno-3-48" name="__codelineno-3-48"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">distance</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">220</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-3-49"><a id="__codelineno-3-49" name="__codelineno-3-49"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">duration</span><span class="w"> </span><span class="o">=</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-3-50"><a id="__codelineno-3-50" name="__codelineno-3-50"></a>
|
|
</span><span id="__span-3-51"><a id="__codelineno-3-51" name="__codelineno-3-51"></a><span class="w"> </span><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">"SI units with 'int' as representation</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
|
</span><span id="__span-3-52"><a id="__codelineno-3-52" name="__codelineno-3-52"></a>
|
|
</span><span id="__span-3-53"><a id="__codelineno-3-53" name="__codelineno-3-53"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_int_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-3-54"><a id="__codelineno-3-54" name="__codelineno-3-54"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_double_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-3-55"><a id="__codelineno-3-55" name="__codelineno-3-55"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-3-56"><a id="__codelineno-3-56" name="__codelineno-3-56"></a><span class="w"> </span><span class="p">}</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<p>The above provides the following output:</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>SI units with 'int' as representation
|
|
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>Average speed of a car that makes 220 km in 2 h is 108 km/h.
|
|
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a>Average speed of a car that makes 220 km in 2 h is 110 km/h.
|
|
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a>Average speed of a car that makes 220 km in 2 h is 110 km/h.
|
|
</span></code></pre></div>
|
|
<p>Please note that in the first two cases, we must convert length from <code>km</code> to <code>m</code> and
|
|
time from <code>h</code> to <code>s</code>. The converted values are used to calculate speed in <code>m/s</code> which
|
|
is then again converted to the one in <code>km/h</code>. Those conversions not only impact the
|
|
application's runtime performance but may also affect the precision of the final result.
|
|
Such truncation can be easily observed in the first case where we deal with integral
|
|
representation types (the resulting speed is <code>108 km/h</code>).</p>
|
|
<p>The second scenario is really similar to the previous one, but this time, function arguments
|
|
have floating-point representation types:</p>
|
|
<div class="language-cpp highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">avg_speed.cpp</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-5-57">57</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-58">58</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-59">59</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-60">60</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-61">61</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-62">62</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-63">63</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-64">64</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-65">65</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-66">66</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-67">67</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-68">68</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-5-57"><a id="__codelineno-5-57" name="__codelineno-5-57"></a><span class="w"> </span><span class="c1">// SI (double)</span>
|
|
</span><span id="__span-5-58"><a id="__codelineno-5-58" name="__codelineno-5-58"></a><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-5-59"><a id="__codelineno-5-59" name="__codelineno-5-59"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">distance</span><span class="w"> </span><span class="o">=</span><span class="w"> </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><span id="__span-5-60"><a id="__codelineno-5-60" name="__codelineno-5-60"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">duration</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">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-5-61"><a id="__codelineno-5-61" name="__codelineno-5-61"></a>
|
|
</span><span id="__span-5-62"><a id="__codelineno-5-62" name="__codelineno-5-62"></a><span class="w"> </span><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="se">\n</span><span class="s">SI units with 'double' as representation</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
|
</span><span id="__span-5-63"><a id="__codelineno-5-63" name="__codelineno-5-63"></a>
|
|
</span><span id="__span-5-64"><a id="__codelineno-5-64" name="__codelineno-5-64"></a><span class="w"> </span><span class="c1">// conversion from a floating-point to an integral type is a truncating one so an explicit cast is needed</span>
|
|
</span><span id="__span-5-65"><a id="__codelineno-5-65" name="__codelineno-5-65"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_int_si_avg_speed</span><span class="p">(</span><span class="n">value_cast</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">distance</span><span class="p">),</span><span class="w"> </span><span class="n">value_cast</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">duration</span><span class="p">)));</span>
|
|
</span><span id="__span-5-66"><a id="__codelineno-5-66" name="__codelineno-5-66"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_double_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-5-67"><a id="__codelineno-5-67" name="__codelineno-5-67"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-5-68"><a id="__codelineno-5-68" name="__codelineno-5-68"></a><span class="w"> </span><span class="p">}</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<p>Conversion from floating-point to integral representation types is
|
|
<a href="../../framework_basics/value_conversions/#value-truncating-conversions">considered value-truncating</a>
|
|
and that is why now, in the first case, we need an explicit call to <code>value_cast<int></code>.</p>
|
|
<p>In the text output, we can observe that, again, the resulting value gets truncated during conversions
|
|
in the first cast:</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a>SI units with 'double' as representation
|
|
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a>Average speed of a car that makes 220 km in 2 h is 108 km/h.
|
|
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a>Average speed of a car that makes 220 km in 2 h is 110 km/h.
|
|
</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a>Average speed of a car that makes 220 km in 2 h is 110 km/h.
|
|
</span></code></pre></div>
|
|
<p>Next, let's do the same for integral and floating-point representations, but this time
|
|
using international mile:</p>
|
|
<div class="language-cpp highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">avg_speed.cpp</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-7-69"> 69</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-70"> 70</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-71"> 71</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-72"> 72</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-73"> 73</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-74"> 74</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-75"> 75</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-76"> 76</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-77"> 77</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-78"> 78</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-79"> 79</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-80"> 80</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-81"> 81</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-82"> 82</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-83"> 83</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-84"> 84</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-85"> 85</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-86"> 86</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-87"> 87</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-88"> 88</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-89"> 89</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-90"> 90</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-91"> 91</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-92"> 92</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-93"> 93</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-94"> 94</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-95"> 95</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-96"> 96</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-97"> 97</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-98"> 98</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-99"> 99</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-100">100</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-7-69"><a id="__codelineno-7-69" name="__codelineno-7-69"></a><span class="w"> </span><span class="c1">// International mile (int)</span>
|
|
</span><span id="__span-7-70"><a id="__codelineno-7-70" name="__codelineno-7-70"></a><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-7-71"><a id="__codelineno-7-71" name="__codelineno-7-71"></a><span class="w"> </span><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-7-72"><a id="__codelineno-7-72" name="__codelineno-7-72"></a>
|
|
</span><span id="__span-7-73"><a id="__codelineno-7-73" name="__codelineno-7-73"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">distance</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">140</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">mi</span><span class="p">;</span>
|
|
</span><span id="__span-7-74"><a id="__codelineno-7-74" name="__codelineno-7-74"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">duration</span><span class="w"> </span><span class="o">=</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-7-75"><a id="__codelineno-7-75" name="__codelineno-7-75"></a>
|
|
</span><span id="__span-7-76"><a id="__codelineno-7-76" name="__codelineno-7-76"></a><span class="w"> </span><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="se">\n</span><span class="s">International mile with 'int' as representation</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
|
</span><span id="__span-7-77"><a id="__codelineno-7-77" name="__codelineno-7-77"></a>
|
|
</span><span id="__span-7-78"><a id="__codelineno-7-78" name="__codelineno-7-78"></a><span class="w"> </span><span class="c1">// it is not possible to make a lossless conversion of miles to meters on an integral type</span>
|
|
</span><span id="__span-7-79"><a id="__codelineno-7-79" name="__codelineno-7-79"></a><span class="w"> </span><span class="c1">// (explicit cast needed)</span>
|
|
</span><span id="__span-7-80"><a id="__codelineno-7-80" name="__codelineno-7-80"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_int_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">.</span><span class="n">force_in</span><span class="p">(</span><span class="n">m</span><span class="p">),</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-7-81"><a id="__codelineno-7-81" name="__codelineno-7-81"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_double_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-7-82"><a id="__codelineno-7-82" name="__codelineno-7-82"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-7-83"><a id="__codelineno-7-83" name="__codelineno-7-83"></a><span class="w"> </span><span class="p">}</span>
|
|
</span><span id="__span-7-84"><a id="__codelineno-7-84" name="__codelineno-7-84"></a>
|
|
</span><span id="__span-7-85"><a id="__codelineno-7-85" name="__codelineno-7-85"></a><span class="w"> </span><span class="c1">// International mile (double)</span>
|
|
</span><span id="__span-7-86"><a id="__codelineno-7-86" name="__codelineno-7-86"></a><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-7-87"><a id="__codelineno-7-87" name="__codelineno-7-87"></a><span class="w"> </span><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-7-88"><a id="__codelineno-7-88" name="__codelineno-7-88"></a>
|
|
</span><span id="__span-7-89"><a id="__codelineno-7-89" name="__codelineno-7-89"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">distance</span><span class="w"> </span><span class="o">=</span><span class="w"> </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><span id="__span-7-90"><a id="__codelineno-7-90" name="__codelineno-7-90"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">duration</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">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-7-91"><a id="__codelineno-7-91" name="__codelineno-7-91"></a>
|
|
</span><span id="__span-7-92"><a id="__codelineno-7-92" name="__codelineno-7-92"></a><span class="w"> </span><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="se">\n</span><span class="s">International mile with 'double' as representation</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
|
</span><span id="__span-7-93"><a id="__codelineno-7-93" name="__codelineno-7-93"></a>
|
|
</span><span id="__span-7-94"><a id="__codelineno-7-94" name="__codelineno-7-94"></a><span class="w"> </span><span class="c1">// conversion from a floating-point to an integral type is a truncating one so an explicit cast is needed</span>
|
|
</span><span id="__span-7-95"><a id="__codelineno-7-95" name="__codelineno-7-95"></a><span class="w"> </span><span class="c1">// also it is not possible to make a lossless conversion of miles to meters on an integral type</span>
|
|
</span><span id="__span-7-96"><a id="__codelineno-7-96" name="__codelineno-7-96"></a><span class="w"> </span><span class="c1">// (explicit cast needed)</span>
|
|
</span><span id="__span-7-97"><a id="__codelineno-7-97" name="__codelineno-7-97"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_int_si_avg_speed</span><span class="p">(</span><span class="n">value_cast</span><span class="o"><</span><span class="n">m</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">distance</span><span class="p">),</span><span class="w"> </span><span class="n">value_cast</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">duration</span><span class="p">)));</span>
|
|
</span><span id="__span-7-98"><a id="__codelineno-7-98" name="__codelineno-7-98"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_double_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-7-99"><a id="__codelineno-7-99" name="__codelineno-7-99"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-7-100"><a id="__codelineno-7-100" name="__codelineno-7-100"></a><span class="w"> </span><span class="p">}</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<p>One important difference here is the fact that as it is not possible to make a lossless conversion
|
|
of miles to meters on a quantity using an integral representation type, so this time, we need a
|
|
<code>value_cast<m, int></code> to force it.</p>
|
|
<p>If we check the text output of the above, we will see the following:</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a>International mile with 'int' as representation
|
|
</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a>Average speed of a car that makes 140 mi in 2 h is 111 km/h.
|
|
</span><span id="__span-8-3"><a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a>Average speed of a car that makes 140 mi in 2 h is 112.654 km/h.
|
|
</span><span id="__span-8-4"><a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a>Average speed of a car that makes 140 mi in 2 h is 112 km/h.
|
|
</span><span id="__span-8-5"><a id="__codelineno-8-5" name="__codelineno-8-5" href="#__codelineno-8-5"></a>
|
|
</span><span id="__span-8-6"><a id="__codelineno-8-6" name="__codelineno-8-6" href="#__codelineno-8-6"></a>International mile with 'double' as representation
|
|
</span><span id="__span-8-7"><a id="__codelineno-8-7" name="__codelineno-8-7" href="#__codelineno-8-7"></a>Average speed of a car that makes 140 mi in 2 h is 111 km/h.
|
|
</span><span id="__span-8-8"><a id="__codelineno-8-8" name="__codelineno-8-8" href="#__codelineno-8-8"></a>Average speed of a car that makes 140 mi in 2 h is 112.654 km/h.
|
|
</span><span id="__span-8-9"><a id="__codelineno-8-9" name="__codelineno-8-9" href="#__codelineno-8-9"></a>Average speed of a car that makes 140 mi in 2 h is 112.654 km/h.
|
|
</span></code></pre></div>
|
|
<p>Please note how the first and third results get truncated using integral representation types.</p>
|
|
<p>In the end, we repeat the scenario for CGS units:</p>
|
|
<div class="language-cpp highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">avg_speed.cpp</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-9-101">101</a></span>
|
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<span class="normal"><a href="#__codelineno-9-102">102</a></span>
|
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<span class="normal"><a href="#__codelineno-9-103">103</a></span>
|
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<span class="normal"><a href="#__codelineno-9-104">104</a></span>
|
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<span class="normal"><a href="#__codelineno-9-105">105</a></span>
|
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<span class="normal"><a href="#__codelineno-9-106">106</a></span>
|
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<span class="normal"><a href="#__codelineno-9-107">107</a></span>
|
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<span class="normal"><a href="#__codelineno-9-108">108</a></span>
|
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<span class="normal"><a href="#__codelineno-9-109">109</a></span>
|
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<span class="normal"><a href="#__codelineno-9-110">110</a></span>
|
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<span class="normal"><a href="#__codelineno-9-111">111</a></span>
|
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<span class="normal"><a href="#__codelineno-9-112">112</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-113">113</a></span>
|
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<span class="normal"><a href="#__codelineno-9-114">114</a></span>
|
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<span class="normal"><a href="#__codelineno-9-115">115</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-116">116</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-117">117</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-118">118</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-119">119</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-120">120</a></span>
|
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<span class="normal"><a href="#__codelineno-9-121">121</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-122">122</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-123">123</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-124">124</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-125">125</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-126">126</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-127">127</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-128">128</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-129">129</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-130">130</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-131">131</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-132">132</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-9-101"><a id="__codelineno-9-101" name="__codelineno-9-101"></a><span class="w"> </span><span class="c1">// CGS (int)</span>
|
|
</span><span id="__span-9-102"><a id="__codelineno-9-102" name="__codelineno-9-102"></a><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-9-103"><a id="__codelineno-9-103" name="__codelineno-9-103"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">distance</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">22'000'000</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">cgs</span><span class="o">::</span><span class="n">centimetre</span><span class="p">;</span>
|
|
</span><span id="__span-9-104"><a id="__codelineno-9-104" name="__codelineno-9-104"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">duration</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">7200</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">cgs</span><span class="o">::</span><span class="n">second</span><span class="p">;</span>
|
|
</span><span id="__span-9-105"><a id="__codelineno-9-105" name="__codelineno-9-105"></a>
|
|
</span><span id="__span-9-106"><a id="__codelineno-9-106" name="__codelineno-9-106"></a><span class="w"> </span><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="se">\n</span><span class="s">CGS units with 'int' as representation</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
|
</span><span id="__span-9-107"><a id="__codelineno-9-107" name="__codelineno-9-107"></a>
|
|
</span><span id="__span-9-108"><a id="__codelineno-9-108" name="__codelineno-9-108"></a><span class="w"> </span><span class="c1">// it is not possible to make a lossless conversion of centimeters to meters on an integral type</span>
|
|
</span><span id="__span-9-109"><a id="__codelineno-9-109" name="__codelineno-9-109"></a><span class="w"> </span><span class="c1">// (explicit cast needed)</span>
|
|
</span><span id="__span-9-110"><a id="__codelineno-9-110" name="__codelineno-9-110"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_int_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">.</span><span class="n">force_in</span><span class="p">(</span><span class="n">m</span><span class="p">),</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-9-111"><a id="__codelineno-9-111" name="__codelineno-9-111"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_double_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-9-112"><a id="__codelineno-9-112" name="__codelineno-9-112"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-9-113"><a id="__codelineno-9-113" name="__codelineno-9-113"></a><span class="w"> </span><span class="p">}</span>
|
|
</span><span id="__span-9-114"><a id="__codelineno-9-114" name="__codelineno-9-114"></a>
|
|
</span><span id="__span-9-115"><a id="__codelineno-9-115" name="__codelineno-9-115"></a><span class="w"> </span><span class="c1">// CGS (double)</span>
|
|
</span><span id="__span-9-116"><a id="__codelineno-9-116" name="__codelineno-9-116"></a><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-9-117"><a id="__codelineno-9-117" name="__codelineno-9-117"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">distance</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">22'000'000.</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">cgs</span><span class="o">::</span><span class="n">centimetre</span><span class="p">;</span>
|
|
</span><span id="__span-9-118"><a id="__codelineno-9-118" name="__codelineno-9-118"></a><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">duration</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">7200.</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">cgs</span><span class="o">::</span><span class="n">second</span><span class="p">;</span>
|
|
</span><span id="__span-9-119"><a id="__codelineno-9-119" name="__codelineno-9-119"></a>
|
|
</span><span id="__span-9-120"><a id="__codelineno-9-120" name="__codelineno-9-120"></a><span class="w"> </span><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="se">\n</span><span class="s">CGS units with 'double' as representation</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
|
</span><span id="__span-9-121"><a id="__codelineno-9-121" name="__codelineno-9-121"></a>
|
|
</span><span id="__span-9-122"><a id="__codelineno-9-122" name="__codelineno-9-122"></a><span class="w"> </span><span class="c1">// conversion from a floating-point to an integral type is a truncating one so an explicit cast is needed</span>
|
|
</span><span id="__span-9-123"><a id="__codelineno-9-123" name="__codelineno-9-123"></a><span class="w"> </span><span class="c1">// it is not possible to make a lossless conversion of centimeters to meters on an integral type</span>
|
|
</span><span id="__span-9-124"><a id="__codelineno-9-124" name="__codelineno-9-124"></a><span class="w"> </span><span class="c1">// (explicit cast needed)</span>
|
|
</span><span id="__span-9-125"><a id="__codelineno-9-125" name="__codelineno-9-125"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_int_si_avg_speed</span><span class="p">(</span><span class="n">value_cast</span><span class="o"><</span><span class="n">m</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">distance</span><span class="p">),</span><span class="w"> </span><span class="n">value_cast</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">duration</span><span class="p">)));</span>
|
|
</span><span id="__span-9-126"><a id="__codelineno-9-126" name="__codelineno-9-126"></a>
|
|
</span><span id="__span-9-127"><a id="__codelineno-9-127" name="__codelineno-9-127"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">fixed_double_si_avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-9-128"><a id="__codelineno-9-128" name="__codelineno-9-128"></a><span class="w"> </span><span class="n">print_result</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">,</span><span class="w"> </span><span class="n">avg_speed</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span><span class="w"> </span><span class="n">duration</span><span class="p">));</span>
|
|
</span><span id="__span-9-129"><a id="__codelineno-9-129" name="__codelineno-9-129"></a><span class="w"> </span><span class="p">}</span>
|
|
</span><span id="__span-9-130"><a id="__codelineno-9-130" name="__codelineno-9-130"></a><span class="p">}</span>
|
|
</span><span id="__span-9-131"><a id="__codelineno-9-131" name="__codelineno-9-131"></a>
|
|
</span><span id="__span-9-132"><a id="__codelineno-9-132" name="__codelineno-9-132"></a><span class="p">}</span><span class="w"> </span><span class="c1">// namespace</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<p>Again, we observe <code>value_cast</code> being used in the same places and consistent truncation errors
|
|
in the text output:</p>
|
|
<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>CGS units with 'int' as representation
|
|
</span><span id="__span-10-2"><a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a>Average speed of a car that makes 22000000 cm in 7200 s is 108 km/h.
|
|
</span><span id="__span-10-3"><a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a>Average speed of a car that makes 22000000 cm in 7200 s is 110 km/h.
|
|
</span><span id="__span-10-4"><a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a>Average speed of a car that makes 22000000 cm in 7200 s is 109 km/h.
|
|
</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>CGS units with 'double' as representation
|
|
</span><span id="__span-10-7"><a id="__codelineno-10-7" name="__codelineno-10-7" href="#__codelineno-10-7"></a>Average speed of a car that makes 2.2e+07 cm in 7200 s is 108 km/h.
|
|
</span><span id="__span-10-8"><a id="__codelineno-10-8" name="__codelineno-10-8" href="#__codelineno-10-8"></a>Average speed of a car that makes 2.2e+07 cm in 7200 s is 110 km/h.
|
|
</span><span id="__span-10-9"><a id="__codelineno-10-9" name="__codelineno-10-9" href="#__codelineno-10-9"></a>Average speed of a car that makes 2.2e+07 cm in 7200 s is 110 km/h.
|
|
</span></code></pre></div>
|
|
<p>The example file ends with a simple <code>main()</code> function:</p>
|
|
<div class="language-cpp highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">avg_speed.cpp</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-11-133">133</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-134">134</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-135">135</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-136">136</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-137">137</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-138">138</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-139">139</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-140">140</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-141">141</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-142">142</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-11-133"><a id="__codelineno-11-133" name="__codelineno-11-133"></a><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
|
|
</span><span id="__span-11-134"><a id="__codelineno-11-134" name="__codelineno-11-134"></a><span class="p">{</span>
|
|
</span><span id="__span-11-135"><a id="__codelineno-11-135" name="__codelineno-11-135"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-11-136"><a id="__codelineno-11-136" name="__codelineno-11-136"></a><span class="w"> </span><span class="n">example</span><span class="p">();</span>
|
|
</span><span id="__span-11-137"><a id="__codelineno-11-137" name="__codelineno-11-137"></a><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">exception</span><span class="o">&</span><span class="w"> </span><span class="n">ex</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-11-138"><a id="__codelineno-11-138" name="__codelineno-11-138"></a><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">cerr</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"Unhandled std exception caught: "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">ex</span><span class="p">.</span><span class="n">what</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><span id="__span-11-139"><a id="__codelineno-11-139" name="__codelineno-11-139"></a><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(...)</span><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-11-140"><a id="__codelineno-11-140" name="__codelineno-11-140"></a><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">cerr</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"Unhandled unknown exception caught</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
|
|
</span><span id="__span-11-141"><a id="__codelineno-11-141" name="__codelineno-11-141"></a><span class="w"> </span><span class="p">}</span>
|
|
</span><span id="__span-11-142"><a id="__codelineno-11-142" name="__codelineno-11-142"></a><span class="p">}</span>
|
|
</span></code></pre></div></td></tr></table></div>
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