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<td >Qt 5.12</td><td ><a href="qtcore-index.html">Qt Core</a></td><td >&lt;QFloat16&gt; - 16-bit Floating Point Support</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtcore-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h1 class="title">&lt;QFloat16&gt; - 16-bit Floating Point Support</h1>
<span class="subtitle"></span>
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<p>The &lt;QFloat16&gt; header file provides 16-bit floating point support. <a href="#details">More...</a></p>
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<p>This documentation was introduced in  Qt 5.9.</p>
<ul>
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<a name="Functions"></a>
<h2 id="Functions">Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#qFloatFromFloat16">qFloatFromFloat16</a></b>(float *<i>out</i>, const qfloat16 *<i>in</i>, qsizetype <i>len</i>)</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#qFloatToFloat16">qFloatToFloat16</a></b>(qfloat16 *<i>out</i>, const float *<i>in</i>, qsizetype <i>len</i>)</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#qFuzzyCompare">qFuzzyCompare</a></b>(qfloat16 <i>p1</i>, qfloat16 <i>p2</i>)</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#qIsFinite">qIsFinite</a></b>(qfloat16 <i>f</i>)</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#qIsInf">qIsInf</a></b>(qfloat16 <i>f</i>)</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#qIsNaN">qIsNaN</a></b>(qfloat16 <i>f</i>)</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> qint64 </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#qRound64">qRound64</a></b>(qfloat16 <i>value</i>)</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#qRound">qRound</a></b>(qfloat16 <i>value</i>)</td></tr>
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<a name="Macros"></a>
<h2 id="Macros">Macros</h2>
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<tr><td class="memItemLeft topAlign rightAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qfloat16.html#QT_NO_FLOAT16_OPERATORS">QT_NO_FLOAT16_OPERATORS</a></b></td></tr>
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<!-- $$$<QFloat16>-description -->
<div class="descr"> <a name="details"></a>
<p>This header file provides support for half-precision (16-bit) floating point data with the class <code>qfloat16</code>. It is fully compliant with IEEE 754 as a storage type. This implies that any arithmetic operation on a <code>qfloat16</code> instance results in the value first being converted to a <code>float</code>. This conversion to and from <code>float</code> is performed by hardware when possible, but on processors that do not natively support half-precision, the conversion is performed through a sequence of lookup table operations.</p>
<p><code>qfloat16</code> should be treated as if it were a POD (plain old data) type. Consequently, none of the supported operations need any elaboration beyond stating that it supports all arithmetic operators incident to floating point types.</p>
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<h2>Function Documentation</h2>
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<h3 class="fn" id="qFloatFromFloat16"><a name="qFloatFromFloat16"></a><span class="type">void</span> <span class="name">qFloatFromFloat16</span>(<span class="type">float</span> *<i>out</i>, const <span class="type">qfloat16</span> *<i>in</i>, <span class="type">qsizetype</span> <i>len</i>)</h3>
<p>Converts <i>len</i> qfloat16 from <i>in</i> to floats and stores them in <i>out</i>. Both <i>in</i> and <i>out</i> must have <i>len</i> allocated entries.</p>
<p>This function was introduced in  Qt 5.11.</p>
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<h3 class="fn" id="qFloatToFloat16"><a name="qFloatToFloat16"></a><span class="type">void</span> <span class="name">qFloatToFloat16</span>(<span class="type">qfloat16</span> *<i>out</i>, const <span class="type">float</span> *<i>in</i>, <span class="type">qsizetype</span> <i>len</i>)</h3>
<p>Converts <i>len</i> floats from <i>in</i> to qfloat16 and stores them in <i>out</i>. Both <i>in</i> and <i>out</i> must have <i>len</i> allocated entries.</p>
<p>This function was introduced in  Qt 5.11.</p>
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<h3 class="fn" id="qFuzzyCompare"><a name="qFuzzyCompare"></a><span class="type">bool</span> <span class="name">qFuzzyCompare</span>(<span class="type">qfloat16</span> <i>p1</i>, <span class="type">qfloat16</span> <i>p2</i>)</h3>
<p>Compares the floating point value <i>p1</i> and <i>p2</i> and returns <code>true</code> if they are considered equal, otherwise <code>false</code>.</p>
<p>The two numbers are compared in a relative way, where the exactness is stronger the smaller the numbers are.</p>
<!-- @@@qFuzzyCompare -->
<!-- $$$qIsFinite[overload1]$$$qIsFiniteqfloat16 -->
<h3 class="fn" id="qIsFinite"><a name="qIsFinite"></a><span class="type">bool</span> <span class="name">qIsFinite</span>(<span class="type">qfloat16</span> <i>f</i>)</h3>
<p>Returns true if the <code>qfloat16</code> <i>f</i> is a finite number.</p>
<p><b>See also </b><a href="qtglobal.html#qIsFinite">qIsFinite</a>.</p>
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<!-- $$$qIsInf[overload1]$$$qIsInfqfloat16 -->
<h3 class="fn" id="qIsInf"><a name="qIsInf"></a><span class="type">bool</span> <span class="name">qIsInf</span>(<span class="type">qfloat16</span> <i>f</i>)</h3>
<p>Returns true if the <code>qfloat16</code> <i>f</i> is equivalent to infinity.</p>
<p><b>See also </b><a href="qtglobal.html#qIsInf">qIsInf</a>.</p>
<!-- @@@qIsInf -->
<!-- $$$qIsNaN[overload1]$$$qIsNaNqfloat16 -->
<h3 class="fn" id="qIsNaN"><a name="qIsNaN"></a><span class="type">bool</span> <span class="name">qIsNaN</span>(<span class="type">qfloat16</span> <i>f</i>)</h3>
<p>Returns true if the <code>qfloat16</code> <i>f</i> is not a number (NaN).</p>
<p><b>See also </b><a href="qtglobal.html#qIsNaN">qIsNaN</a>.</p>
<!-- @@@qIsNaN -->
<!-- $$$qRound64[overload1]$$$qRound64qfloat16 -->
<h3 class="fn" id="qRound64"><a name="qRound64"></a><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> <span class="name">qRound64</span>(<span class="type">qfloat16</span> <i>value</i>)</h3>
<p>Rounds <i>value</i> to the nearest 64-bit integer.</p>
<p><b>See also </b><a href="qtglobal.html#qRound64">qRound64</a>.</p>
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<!-- $$$qRound[overload1]$$$qRoundqfloat16 -->
<h3 class="fn" id="qRound"><a name="qRound"></a><span class="type">int</span> <span class="name">qRound</span>(<span class="type">qfloat16</span> <i>value</i>)</h3>
<p>Rounds <i>value</i> to the nearest integer.</p>
<p><b>See also </b><a href="qtglobal.html#qRound">qRound</a>.</p>
<!-- @@@qRound -->
<h2>Macro Documentation</h2>
<!-- $$$QT_NO_FLOAT16_OPERATORS[overload1]$$$QT_NO_FLOAT16_OPERATORS -->
<h3 class="fn" id="QT_NO_FLOAT16_OPERATORS"><a name="QT_NO_FLOAT16_OPERATORS"></a><span class="name">QT_NO_FLOAT16_OPERATORS</span></h3>
<p>Defining this macro disables the arithmetic operators for qfloat16.</p>
<p>This is only necessary on Visual Studio 2017 (and earlier) when including <code>&lt;QFloat16&gt;</code> and <code>&lt;bitset&gt;</code> in the same translation unit, which would otherwise cause a compilation error due to a toolchain bug (see [QTBUG-72073]).</p>
<p>This function was introduced in  Qt 5.12.4.</p>
<!-- @@@QT_NO_FLOAT16_OPERATORS -->
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