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<title>Issue 605: [dec.tr] &lt;decfloat.h&gt; doesn't live here anymore.</title>
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<p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#TRDec">TRDec</a> status.</em></p>
<h3 id="605"><a href="lwg-defects.html#605">605</a>. [dec.tr] &lt;decfloat.h&gt; doesn't live here anymore.</h3>
<p><b>Section:</b> 3.4 [dec.tr::trdec.types.cdecfloat] <b>Status:</b> <a href="lwg-active.html#TRDec">TRDec</a>
 <b>Submitter:</b> Robert Klarer <b>Opened:</b> 2006-10-17 <b>Last modified:</b> 2016-01-31</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View all issues with</b> <a href="lwg-status.html#TRDec">TRDec</a> status.</p>
<p><b>Discussion:</b></p>
<p>
In Berlin, WG14 decided to drop the &lt;decfloat.h> header.  The contents of that header have been moved into &lt;float.h>.  For the sake of C compatibility, we should make corresponding changes.
</p>


<p id="res-605"><b>Proposed resolution:</b></p>
<p>
1. Change the heading of subclause 3.4, "Headers <code>&lt;cdecfloat></code> and <code>&lt;decfloat.h></code>" to "Additions to headers <code>&lt;cfloat></code> and <code>&lt;float.h></code>."
</p>
<p>
2. Change the text of subclause 3.4 as follows:
</p>
<blockquote>
<p>
<del>The standard C++ headers <code>&lt;cfloat></code> and <code>&lt;float.h></code> define characteristics of the floating-point types <code>float</code>, <code>double</code>, and <code>long double</code>.  Their contents remain unchanged by this Technical Report.</del>
</p>
<p>
<del>Headers <code>&lt;cdecfloat></code> and <code>&lt;decfloat.h></code> define characteristics of the decimal floating-point types <code>decimal32</code>, <code>decimal64</code>, and <code>decimal128</code>.  As well, <code>&lt;decfloat.h></code> defines the convenience typedefs <code>_Decimal32</code>, <code>_Decimal64</code>, and <code>_Decimal128</code>, for compatibilty with the C programming language.</del>
</p>
<p>
<ins>The header <code>&lt;cfloat></code> is described in [tr.c99.cfloat].  The header <code>&lt;float.h></code> is described in [tr.c99.floath]. These headers are extended by this Technical Report to define characteristics of the decimal floating-point types <code>decimal32</code>, <code>decimal64</code>, and <code>decimal128</code>.  As well, <code>&lt;float.h></code> is extended to define the convenience typedefs <code>_Decimal32</code>, <code>_Decimal64</code>, and <code>_Decimal128</code> for compatibility with the C programming language.</ins>
</p>
</blockquote>
<p>
3. Change the heading of subclause 3.4.1, "Header <code>&lt;cdecfloat></code> synopsis"  to "Additions to header <code>&lt;cfloat></code> synopsis."
</p>
<p>
4. Change the heading of subclause 3.4.2, "Header <code>&lt;decfloat.h></code> synopsis" to "Additions to header <code>&lt;float.h></code> synopsis."
</p>
<p>
5. Change the contents of 3.4.2 as follows:
</p>
<pre>
      <del>#include &lt;cdecfloat></del>

      // <i>C-compatibility convenience typedefs:</i>

      typedef std::decimal::decimal32  _Decimal32;
      typedef std::decimal::decimal64  _Decimal64;
      typedef std::decimal::decimal128 _Decimal128;
</pre>





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