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27<a name="boost.units.quantity"></a><div class="titlepage"></div>
28<div class="refnamediv">
29<h2><span class="refentrytitle">Class template quantity</span></h2>
30<p>boost::units::quantity — class declaration </p>
31</div>
32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_units/Reference.html#header.boost.units.quantity_hpp" title="Header &lt;boost/units/quantity.hpp&gt;">boost/units/quantity.hpp</a>&gt;
34
35</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit<span class="special">,</span> <span class="keyword">typename</span> Y<span class="special">&gt;</span>
36<span class="keyword">class</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a> <span class="special">{</span>
37<span class="keyword">public</span><span class="special">:</span>
38  <span class="comment">// types</span>
39  <span class="keyword">typedef</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">Y</span> <span class="special">&gt;</span> <a name="boost.units.quantity.this_type"></a><span class="identifier">this_type</span><span class="special">;</span>
40  <span class="keyword">typedef</span> <span class="identifier">Y</span>                   <a name="boost.units.quantity.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>
41  <span class="keyword">typedef</span> <span class="identifier">Unit</span>                <a name="boost.units.quantity.unit_type"></a><span class="identifier">unit_type</span><span class="special">;</span>
42
43  <span class="comment">// <a class="link" href="quantity.html#boost.units.quantityconstruct-copy-destruct">construct/copy/destruct</a></span>
44  <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_8-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
45  <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_9-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="identifier">unspecified_null_pointer_constant_type</span><span class="special">)</span><span class="special">;</span>
46  <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_10-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">this_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
47  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span>
48    <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_12-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
49  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span>
50    <span class="keyword">explicit</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_13-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
51  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
52    <span class="keyword">explicit</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_15-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
53  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
54    <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_16-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
55  <span class="keyword">explicit</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_20-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
56  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_11-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">this_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
57  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span>
58    <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_14-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
59  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
60    <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_17-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
61
62  <span class="comment">// <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_6-bb">private member functions</a></span>
63   <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_6_1-bb"><span class="identifier">BOOST_MPL_ASSERT_NOT</span></a><span class="special">(</span><span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span>
64
65  <span class="comment">// <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_7-bb">public member functions</a></span>
66  <span class="identifier">BOOST_CONSTEXPR</span> <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_7_1-bb"><span class="identifier">value</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
67  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
68    <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
69    <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_7_2-bb"><span class="keyword">operator</span><span class="special">+=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
70  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
71    <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
72    <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_7_3-bb"><span class="keyword">operator</span><span class="special">-=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
73  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
74    <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
75    <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_7_4-bb"><span class="keyword">operator</span> <span class="special">*=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
76  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
77    <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
78    <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_7_5-bb"><span class="keyword">operator</span><span class="special">/=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
79  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_7_6-bb"><span class="keyword">operator</span> <span class="special">*=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
80  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_7_7-bb"><span class="keyword">operator</span><span class="special">/=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
81
82  <span class="comment">// <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_18-bb">public static functions</a></span>
83  <span class="keyword">static</span> <span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">this_type</span> <a class="link" href="quantity.html#id-1_3_44_10_2_36_1_1_3_18_1-bb"><span class="identifier">from_value</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
84<span class="special">}</span><span class="special">;</span></pre></div>
85<div class="refsect1">
86<a name="id-1.3.44.10.2.36.5.4"></a><h2>Description</h2>
87<div class="refsect2">
88<a name="id-1.3.44.10.2.36.5.4.2"></a><h3>
89<a name="boost.units.quantityconstruct-copy-destruct"></a><code class="computeroutput">quantity</code>
90        public
91       construct/copy/destruct</h3>
92<div class="orderedlist"><ol class="orderedlist" type="1">
93<li class="listitem"><pre class="literallayout"><a name="id-1_3_44_10_2_36_1_1_3_8-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
94<li class="listitem"><pre class="literallayout"><a name="id-1_3_44_10_2_36_1_1_3_9-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="identifier">unspecified_null_pointer_constant_type</span><span class="special">)</span><span class="special">;</span></pre></li>
95<li class="listitem"><pre class="literallayout"><a name="id-1_3_44_10_2_36_1_1_3_10-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
96<li class="listitem">
97<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span>
98  <a name="id-1_3_44_10_2_36_1_1_3_12-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>implicit conversion between value types is allowed if allowed for value types themselves </li>
99<li class="listitem">
100<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span>
101  <span class="keyword">explicit</span> <a name="id-1_3_44_10_2_36_1_1_3_13-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>implicit conversion between value types is not allowed if not allowed for value types themselves </li>
102<li class="listitem">
103<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
104  <span class="keyword">explicit</span> <a name="id-1_3_44_10_2_36_1_1_3_15-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>explicit conversion between different unit systems is allowed if implicit conversion is disallowed </li>
105<li class="listitem">
106<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
107  <a name="id-1_3_44_10_2_36_1_1_3_16-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>implicit conversion between different unit systems is allowed if each fundamental dimension is implicitly convertible </li>
108<li class="listitem"><pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_44_10_2_36_1_1_3_20-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> val<span class="special">,</span> <span class="keyword">int</span><span class="special">)</span><span class="special">;</span></pre></li>
109<li class="listitem"><pre class="literallayout"><span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="id-1_3_44_10_2_36_1_1_3_11-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
110<li class="listitem">
111<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span>
112  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
113  <a name="id-1_3_44_10_2_36_1_1_3_14-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>implicit assignment between value types is allowed if allowed for value types themselves </li>
114<li class="listitem">
115<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
116  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
117  <a name="id-1_3_44_10_2_36_1_1_3_17-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>implicit assignment between different unit systems is allowed if each fundamental dimension is implicitly convertible </li>
118</ol></div>
119</div>
120<div class="refsect2">
121<a name="id-1.3.44.10.2.36.5.4.3"></a><h3>
122<a name="id-1_3_44_10_2_36_1_1_3_6-bb"></a><code class="computeroutput">quantity</code> private member functions</h3>
123<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"> <a name="id-1_3_44_10_2_36_1_1_3_6_1-bb"></a><span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">(</span><span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span></pre></li></ol></div>
124</div>
125<div class="refsect2">
126<a name="id-1.3.44.10.2.36.5.4.4"></a><h3>
127<a name="id-1_3_44_10_2_36_1_1_3_7-bb"></a><code class="computeroutput">quantity</code> public member functions</h3>
128<div class="orderedlist"><ol class="orderedlist" type="1">
129<li class="listitem">
130<pre class="literallayout"><span class="identifier">BOOST_CONSTEXPR</span> <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> <a name="id-1_3_44_10_2_36_1_1_3_7_1-bb"></a><span class="identifier">value</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>constant accessor to value <p>can add a quantity of the same type if add_typeof_helper&lt;value_type,value_type&gt;::type is convertible to value_type </p>
131</li>
132<li class="listitem">
133<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
134  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
135  <a name="id-1_3_44_10_2_36_1_1_3_7_2-bb"></a><span class="keyword">operator</span><span class="special">+=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>can subtract a quantity of the same type if subtract_typeof_helper&lt;value_type,value_type&gt;::type is convertible to value_type </li>
136<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
137  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
138  <a name="id-1_3_44_10_2_36_1_1_3_7_3-bb"></a><span class="keyword">operator</span><span class="special">-=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
139<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
140  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
141  <a name="id-1_3_44_10_2_36_1_1_3_7_4-bb"></a><span class="keyword">operator</span> <span class="special">*=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
142<li class="listitem">
143<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span>
144  <span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span>
145  <a name="id-1_3_44_10_2_36_1_1_3_7_5-bb"></a><span class="keyword">operator</span><span class="special">/=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>can multiply a quantity by a scalar value_type if multiply_typeof_helper&lt;value_type,value_type&gt;::type is convertible to value_type </li>
146<li class="listitem">
147<pre class="literallayout"><span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="id-1_3_44_10_2_36_1_1_3_7_6-bb"></a><span class="keyword">operator</span> <span class="special">*=</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>can divide a quantity by a scalar value_type if divide_typeof_helper&lt;value_type,value_type&gt;::type is convertible to value_type </li>
148<li class="listitem"><pre class="literallayout"><span class="identifier">BOOST_CXX14_CONSTEXPR</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="id-1_3_44_10_2_36_1_1_3_7_7-bb"></a><span class="keyword">operator</span><span class="special">/=</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
149</ol></div>
150</div>
151<div class="refsect2">
152<a name="id-1.3.44.10.2.36.5.4.5"></a><h3>
153<a name="id-1_3_44_10_2_36_1_1_3_18-bb"></a><code class="computeroutput">quantity</code> public static functions</h3>
154<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
155<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">this_type</span> <a name="id-1_3_44_10_2_36_1_1_3_18_1-bb"></a><span class="identifier">from_value</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> val<span class="special">)</span><span class="special">;</span></pre>Construct quantity directly from <code class="computeroutput">value_type</code> (potentially dangerous). </li></ol></div>
156</div>
157<div class="refsect2">
158<a name="id-1.3.44.10.2.36.5.4.6"></a><h3>Specializations</h3>
159<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><a class="link" href="quant_1_3_44_10_2_36_1_1_4.html" title="Class template quantity&lt;BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y&gt;">Class template quantity&lt;BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y&gt;</a></p></li></ul></div>
160</div>
161</div>
162</div>
163<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
164<td align="left"></td>
165<td align="right"><div class="copyright-footer">Copyright © 2003-2008 Matthias Christian Schabel<br>Copyright © 2007-2010 Steven
166      Watanabe<p>
167        Distributed under the Boost Software License, Version 1.0. (See accompanying
168        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
169      </p>
170</div></td>
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