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<h2><span class="refentrytitle">Macro BOOST_UNITS_DEFINE_CONVERSION_OFFSET</span></h2>
<p>BOOST_UNITS_DEFINE_CONVERSION_OFFSET</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<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.absolute_hpp" title="Header &lt;boost/units/absolute.hpp&gt;">boost/units/absolute.hpp</a>&gt;

</span>BOOST_UNITS_DEFINE_CONVERSION_OFFSET(From, To, type_, value_)</pre></div>
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<a name="idp561009360"></a><h2>Description</h2>
<p>Macro to define the offset between two absolute units. Requires the value to be in the destination units e.g </p>
<pre class="programlisting"><span class="identifier">BOOST_UNITS_DEFINE_CONVERSION_OFFSET</span><span class="special">(</span><span class="identifier">celsius_base_unit</span><span class="special">,</span> <span class="identifier">fahrenheit_base_unit</span><span class="special">,</span> <span class="keyword">double</span><span class="special">,</span> <span class="number">32</span><span class="special">.</span><span class="number">0</span><span class="special">)</span><span class="special">;</span>
</pre>
<p> <code class="computeroutput">BOOST_UNITS_DEFINE_CONVERSION_FACTOR</code> is also necessary to specify the conversion factor. Like <code class="computeroutput">BOOST_UNITS_DEFINE_CONVERSION_FACTOR</code> this macro defines both forward and reverse conversions so defining, e.g., the conversion from celsius to fahrenheit as above will also define the inverse conversion from fahrenheit to celsius. </p>
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