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-<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Chapter 4. Support</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" ISO C++ , library "/><meta name="keywords" content=" ISO C++ , runtime , library "/><link rel="home" href="../index.html" title="The GNU C++ Library"/><link rel="up" href="bk01pt02.html" title="Part II. Standard Contents"/><link rel="prev" href="bk01pt02.html" title="Part II. Standard Contents"/><link rel="next" href="dynamic_memory.html" title="Dynamic Memory"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 4.
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+ ISO C++
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+ "><link rel="home" href="../index.html" title="The GNU C++ Library"><link rel="up" href="bk01pt02.html" title="Part II. Standard Contents"><link rel="prev" href="bk01pt02.html" title="Part II. Standard Contents"><link rel="next" href="dynamic_memory.html" title="Dynamic Memory"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 4.
Support
-</th></tr><tr><td align="left"><a accesskey="p" href="bk01pt02.html">Prev</a> </td><th width="60%" align="center">Part II.
+</th></tr><tr><td
width="20%" align="left"><a accesskey="p" href="bk01pt02.html">Prev</a> </td><th width="60%" align="center">Part II.
Standard Contents
- </th><td align="right"> <a accesskey="n" href="dynamic_memory.html">Next</a></td></tr></table><hr/></div><div class="chapter" title="Chapter 4. Support"><div class="titlepage"><div><div><h2 class="title"><a id="std.support"/>Chapter 4.
+ </th><td width="20%" align="right"> <a accesskey="n" href="dynamic_memory.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 4. Support"><div class="titlepage"><div><div><h2 class="title"><a name="std.support"></a>Chapter 4.
Support
- <a id="id494680" class="indexterm"/>
-</h2></div></div></div><div class="toc"><p><
strong>Table of Contents</strong></p><dl><dt><span class="section"><a href="support.html#std.support.types">Types</a></span></dt><dd><dl><dt><span class="section"><a href="support.html#std.support.types.fundamental">Fundamental Types</a></span></dt><dt><span class="section"><a href="support.html#std.support.types.numeric_limits">Numeric Properties</a></span></dt><dt><span class="section"><a href="support.html#std.support.types.null">NULL</a></span></dt></dl></dd><dt><span class="section"><a href="dynamic_memory.html">Dynamic Memory</a></span></dt><dt><span class="section"><a href="termination.html">Termination</a></span></dt><dd><dl><dt><span class="section"><a href="termination.html#support.termination.handlers">Termination Handlers</a></span></dt><dt><span class="section"><a href="termination.html#support.termination.verbose">Verbose Terminate Handler</a></span></dt></dl></dd></dl></div><p>
+ <a class="indexterm" name="id607999"></a>
+</h2></div></div></div><div class="toc"><p><
b>Table of Contents</b></p><dl><dt><span class="section"><a href="support.html#std.support.types">Types</a></span></dt><dd><dl><dt><span class="section"><a href="support.html#std.support.types.fundamental">Fundamental Types</a></span></dt><dt><span class="section"><a href="support.html#std.support.types.numeric_limits">Numeric Properties</a></span></dt><dt><span class="section"><a href="support.html#std.support.types.null">NULL</a></span></dt></dl></dd><dt><span class="section"><a href="dynamic_memory.html">Dynamic Memory</a></span></dt><dt><span class="section"><a href="termination.html">Termination</a></span></dt><dd><dl><dt><span class="section"><a href="termination.html#support.termination.handlers">Termination Handlers</a></span></dt><dt><span class="section"><a href="termination.html#support.termination.verbose">Verbose Terminate Handler</a></span></dt></dl></dd></dl></div><p>
This part deals with the functions called and objects created
automatically during the course of a program's existence.
</p><p>
need to get your own copy from your nation's member body; see our
homepage for help), we can mention a couple of changes in what
kind of support a C++ program gets from the Standard Library.
- </p><div class="section" title="Types"><div class="titlepage"><div><div><h2 class="title"
><a id="std.support.types"/>Types</h2></div></div></div><div class="section" title="Fundamental Types"><div class="titlepage"><div><div><h3 class="title"><a id="std.support.types.fundamental"/>Fundamental Types</h3></div></div></div><p>
+ </p><div class="section" title="Types"><div class="titlepage"><div><div><h2 class="title"
style="clear: both"><a name="std.support.types"></a>Types</h2></div></div></div><div class="section" title="Fundamental Types"><div class="titlepage"><div><div><h3 class="title"><a name="std.support.types.fundamental"></a>Fundamental Types</h3></div></div></div><p>
C++ has the following builtin types:
- </p><div class="itemizedlist"><ul class="itemizedlist"><li class="listitem"><p>
+ </p><div class="itemizedlist"><ul class="itemizedlist"
type="disc"><li class="listitem"><p>
char
</p></li><li class="listitem"><p>
signed char
</p><p>
Specializing parts of the library on these types is prohibited:
instead, use a POD.
- </p></div><div class="section" title="Numeric Properties"><div class="titlepage"><div><div><h3 class="title"><a
id="std.support.types.numeric_limits"/>Numeric Properties</h3></div></div></div><p>
+ </p></div><div class="section" title="Numeric Properties"><div class="titlepage"><div><div><h3 class="title"><a
name="std.support.types.numeric_limits"></a>Numeric Properties</h3></div></div></div><p>
The header <code class="filename">limits</code> defines
traits classes to give access to various implementation
defined-aspects of the fundamental types. The traits classes --
fourteen in total -- are all specializations of the template class
- <code class="classname">numeric_limits</code>, documented <a class="link" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00593.html">here</a>
+ <code class="classname">numeric_limits</code>, documented <a class="link" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00593.html" target="_top">here</a>
and defined as follows:
</p><pre class="programlisting">
template<typename T>
static const bool tinyness_before;
static const float_round_style round_style;
};
- </pre></div><div class="section" title="NULL"><div class="titlepage"><div><div><h3 class="title"><a
id="std.support.types.null"/>NULL</h3></div></div></div><p>
+ </pre></div><div class="section" title="NULL"><div class="titlepage"><div><div><h3 class="title"><a
name="std.support.types.null"></a>NULL</h3></div></div></div><p>
The only change that might affect people is the type of
<code class="constant">NULL</code>: while it is required to be a macro,
the definition of that macro is <span class="emphasis"><em>not</em></span> allowed
overloading won't do what you expect. (This is why
<span class="command"><strong>g++</strong></span> has a magic extension, so that
<code class="constant">NULL</code> is always a pointer.)
- </p><p>In his book <a class="link" href="http://www.awprofessional.com/titles/0-201-92488-9/"><span class="emphasis"><em>Effective
+ </p><p>In his book <a class="link" href="http://www.awprofessional.com/titles/0-201-92488-9/" target="_top"><span class="emphasis"><em>Effective
C++</em></span></a>, Scott Meyers points out that the best way
to solve this problem is to not overload on pointer-vs-integer
types to begin with. He also offers a way to make your own magic
<code class="constant">NULL</code> that will match pointers before it
matches integers.
</p><p>See
- <a class="link" href="http://www.awprofessional.com/titles/0-201-31015-5/">the
+ <a class="link" href="http://www.awprofessional.com/titles/0-201-31015-5/" target="_top">the
Effective C++ CD example</a>
- </p></div></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="bk01pt02.html">Prev</a> </td><td align="center"><a accesskey="u" href="bk01pt02.html">Up</a></td><td align="right"> <a accesskey="n" href="dynamic_memory.html">Next</a></td></tr><tr><td align="left" valign="top">Part II.
+ </p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bk01pt02.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="bk01pt02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="dynamic_memory.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Part II.
Standard Contents
- </td><td align="center"><a accesskey="h" href="../index.html">Home</a></td><td align="right" valign="top"> Dynamic Memory</td></tr></table></div></body></html>
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