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106 lines
4.6 KiB
HTML
106 lines
4.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This manual documents how to install and use the Multiple Precision
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Floating-Point Reliable Library, version 3.1.4.
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Copyright 1991, 1993-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document under
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the terms of the GNU Free Documentation License, Version 1.2 or any later
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version published by the Free Software Foundation; with no Invariant Sections,
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with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the
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license is included in GNU Free Documentation License. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Other Changes (GNU MPFR 3.1.4)</title>
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<meta name="description" content="How to install and use GNU MPFR, a library for reliable multiple precision
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floating-point arithmetic, version 3.1.4.">
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<meta name="keywords" content="Other Changes (GNU MPFR 3.1.4)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="API-Compatibility.html#API-Compatibility" rel="up" title="API Compatibility">
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<link href="Contributors.html#Contributors" rel="next" title="Contributors">
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<link href="Removed-Functions.html#Removed-Functions" rel="prev" title="Removed Functions">
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<style type="text/css">
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Other-Changes"></a>
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<div class="header">
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<p>
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Previous: <a href="Removed-Functions.html#Removed-Functions" accesskey="p" rel="prev">Removed Functions</a>, Up: <a href="API-Compatibility.html#API-Compatibility" accesskey="u" rel="up">API Compatibility</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Other-Changes-1"></a>
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<h3 class="section">6.5 Other Changes</h3>
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<p>For users of a C++ compiler, the way how the availability of <code>intmax_t</code>
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is detected has changed in MPFR 3.0.
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In MPFR 2.x, if a macro <code>INTMAX_C</code> or <code>UINTMAX_C</code> was defined
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(e.g. when the <code>__STDC_CONSTANT_MACROS</code> macro had been defined
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before <code><stdint.h></code> or <code><inttypes.h></code> has been included),
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<code>intmax_t</code> was assumed to be defined.
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However this was not always the case (more precisely, <code>intmax_t</code>
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can be defined only in the namespace <code>std</code>, as with Boost), so
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that compilations could fail.
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Thus the check for <code>INTMAX_C</code> or <code>UINTMAX_C</code> is now disabled for
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C++ compilers, with the following consequences:
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</p>
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<ul>
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<li> Programs written for MPFR 2.x that need <code>intmax_t</code> may no longer
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be compiled against MPFR 3.0: a <code>#define MPFR_USE_INTMAX_T</code> may be
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necessary before <samp>mpfr.h</samp> is included.
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</li><li> The compilation of programs that work with MPFR 3.0 may fail with
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MPFR 2.x due to the problem described above. Workarounds are possible,
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such as defining <code>intmax_t</code> and <code>uintmax_t</code> in the global
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namespace, though this is not clean.
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</li></ul>
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<p>The divide-by-zero exception is new in MPFR 3.1. However it should
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not introduce incompatible changes for programs that strictly follow
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the MPFR API since the exception can only be seen via new functions.
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</p>
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<p>As of MPFR 3.1, the <samp>mpfr.h</samp> header can be included several times,
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while still supporting optional functions (see <a href="Headers-and-Libraries.html#Headers-and-Libraries">Headers and Libraries</a>).
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</p>
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</body>
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</html>
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