1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Headers</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.78.1" /><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="using.html" title="Chapter��3.��Using" /><link rel="prev" href="using.html" title="Chapter��3.��Using" /><link rel="next" href="using_macros.html" title="Macros" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Headers</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="using.html">Prev</a>��</td><th width="60%" align="center">Chapter��3.��Using</th><td width="20%" align="right">��<a accesskey="n" href="using_macros.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.using.headers"></a>Headers</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.headers.all"></a>Header Files</h3></div></div></div><p> 3 The C++ standard specifies the entire set of header files that 4 must be available to all hosted implementations. Actually, the 5 word "files" is a misnomer, since the contents of the 6 headers don't necessarily have to be in any kind of external 7 file. The only rule is that when one <code class="code">#include</code>'s a 8 header, the contents of that header become available, no matter 9 how. 10 </p><p> 11 That said, in practice files are used. 12 </p><p> 13 There are two main types of include files: header files related 14 to a specific version of the ISO C++ standard (called Standard 15 Headers), and all others (TR1, C++ ABI, and Extensions). 16 </p><p> 17 Two dialects of standard headers are supported, corresponding to 18 the 1998 standard as updated for 2003, and the current 2011 standard. 19 </p><p> 20 C++98/03 include files. These are available in the default compilation mode, i.e. <code class="code">-std=c++98</code> or <code class="code">-std=gnu++98</code>. 21 </p><div class="table"><a id="table.cxx98_headers"></a><p class="title"><strong>Table��3.2.��C++ 1998 Library Headers</strong></p><div class="table-contents"><table summary="C++ 1998 Library Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">algorithm</code></td><td align="left"><code class="filename">bitset</code></td><td align="left"><code class="filename">complex</code></td><td align="left"><code class="filename">deque</code></td><td align="left"><code class="filename">exception</code></td></tr><tr><td align="left"><code class="filename">fstream</code></td><td align="left"><code class="filename">functional</code></td><td align="left"><code class="filename">iomanip</code></td><td align="left"><code class="filename">ios</code></td><td align="left"><code class="filename">iosfwd</code></td></tr><tr><td align="left"><code class="filename">iostream</code></td><td align="left"><code class="filename">istream</code></td><td align="left"><code class="filename">iterator</code></td><td align="left"><code class="filename">limits</code></td><td align="left"><code class="filename">list</code></td></tr><tr><td align="left"><code class="filename">locale</code></td><td align="left"><code class="filename">map</code></td><td align="left"><code class="filename">memory</code></td><td align="left"><code class="filename">new</code></td><td align="left"><code class="filename">numeric</code></td></tr><tr><td align="left"><code class="filename">ostream</code></td><td align="left"><code class="filename">queue</code></td><td align="left"><code class="filename">set</code></td><td align="left"><code class="filename">sstream</code></td><td align="left"><code class="filename">stack</code></td></tr><tr><td align="left"><code class="filename">stdexcept</code></td><td align="left"><code class="filename">streambuf</code></td><td align="left"><code class="filename">string</code></td><td align="left"><code class="filename">utility</code></td><td align="left"><code class="filename">typeinfo</code></td></tr><tr><td align="left"><code class="filename">valarray</code></td><td align="left"><code class="filename">vector</code></td><td class="auto-generated">��</td><td class="auto-generated">��</td><td class="auto-generated">��</td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="table.cxx98_cheaders"></a><p class="title"><strong>Table��3.3.��C++ 1998 Library Headers for C Library Facilities</strong></p><div class="table-contents"><table summary="C++ 1998 Library Headers for C Library Facilities" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">cassert</code></td><td align="left"><code class="filename">cerrno</code></td><td align="left"><code class="filename">cctype</code></td><td align="left"><code class="filename">cfloat</code></td><td align="left"><code class="filename">ciso646</code></td></tr><tr><td align="left"><code class="filename">climits</code></td><td align="left"><code class="filename">clocale</code></td><td align="left"><code class="filename">cmath</code></td><td align="left"><code class="filename">csetjmp</code></td><td align="left"><code class="filename">csignal</code></td></tr><tr><td align="left"><code class="filename">cstdarg</code></td><td align="left"><code class="filename">cstddef</code></td><td align="left"><code class="filename">cstdio</code></td><td align="left"><code class="filename">cstdlib</code></td><td align="left"><code class="filename">cstring</code></td></tr><tr><td align="left"><code class="filename">ctime</code></td><td align="left"><code class="filename">cwchar</code></td><td align="left"><code class="filename">cwctype</code></td><td class="auto-generated">��</td><td class="auto-generated">��</td></tr></tbody></table></div></div><br class="table-break" /><p> 22C++11 include files. These are only available in C++11 compilation 23mode, i.e. <code class="literal">-std=c++11</code> or <code class="literal">-std=gnu++11</code>. 24</p><p></p><div class="table"><a id="table.cxx11_headers"></a><p class="title"><strong>Table��3.4.��C++ 2011 Library Headers</strong></p><div class="table-contents"><table summary="C++ 2011 Library Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">algorithm</code></td><td align="left"><code class="filename">array</code></td><td align="left"><code class="filename">bitset</code></td><td align="left"><code class="filename">chrono</code></td><td align="left"><code class="filename">complex</code></td></tr><tr><td align="left"><code class="filename">condition_variable</code></td><td align="left"><code class="filename">deque</code></td><td align="left"><code class="filename">exception</code></td><td align="left"><code class="filename">forward_list</code></td><td align="left"><code class="filename">fstream</code></td></tr><tr><td align="left"><code class="filename">functional</code></td><td align="left"><code class="filename">future</code></td><td align="left"><code class="filename">initalizer_list</code></td><td align="left"><code class="filename">iomanip</code></td><td align="left"><code class="filename">ios</code></td></tr><tr><td align="left"><code class="filename">iosfwd</code></td><td align="left"><code class="filename">iostream</code></td><td align="left"><code class="filename">istream</code></td><td align="left"><code class="filename">iterator</code></td><td align="left"><code class="filename">limits</code></td></tr><tr><td align="left"><code class="filename">list</code></td><td align="left"><code class="filename">locale</code></td><td align="left"><code class="filename">map</code></td><td align="left"><code class="filename">memory</code></td><td align="left"><code class="filename">mutex</code></td></tr><tr><td align="left"><code class="filename">new</code></td><td align="left"><code class="filename">numeric</code></td><td align="left"><code class="filename">ostream</code></td><td align="left"><code class="filename">queue</code></td><td align="left"><code class="filename">random</code></td></tr><tr><td align="left"><code class="filename">ratio</code></td><td align="left"><code class="filename">regex</code></td><td align="left"><code class="filename">set</code></td><td align="left"><code class="filename">sstream</code></td><td align="left"><code class="filename">stack</code></td></tr><tr><td align="left"><code class="filename">stdexcept</code></td><td align="left"><code class="filename">streambuf</code></td><td align="left"><code class="filename">string</code></td><td align="left"><code class="filename">system_error</code></td><td align="left"><code class="filename">thread</code></td></tr><tr><td align="left"><code class="filename">tuple</code></td><td align="left"><code class="filename">type_traits</code></td><td align="left"><code class="filename">typeinfo</code></td><td align="left"><code class="filename">unordered_map</code></td><td align="left"><code class="filename">unordered_set</code></td></tr><tr><td align="left"><code class="filename">utility</code></td><td align="left"><code class="filename">valarray</code></td><td align="left"><code class="filename">vector</code></td><td class="auto-generated">��</td><td class="auto-generated">��</td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="table.cxx11_cheaders"></a><p class="title"><strong>Table��3.5.��C++ 2011 Library Headers for C Library Facilities</strong></p><div class="table-contents"><table summary="C++ 2011 Library Headers for C Library Facilities" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">cassert</code></td><td align="left"><code class="filename">ccomplex</code></td><td align="left"><code class="filename">cctype</code></td><td align="left"><code class="filename">cerrno</code></td><td align="left"><code class="filename">cfenv</code></td></tr><tr><td align="left"><code class="filename">cfloat</code></td><td align="left"><code class="filename">cinttypes</code></td><td align="left"><code class="filename">ciso646</code></td><td align="left"><code class="filename">climits</code></td><td align="left"><code class="filename">clocale</code></td></tr><tr><td align="left"><code class="filename">cmath</code></td><td align="left"><code class="filename">csetjmp</code></td><td align="left"><code class="filename">csignal</code></td><td align="left"><code class="filename">cstdarg</code></td><td align="left"><code class="filename">cstdbool</code></td></tr><tr><td align="left"><code class="filename">cstddef</code></td><td align="left"><code class="filename">cstdint</code></td><td align="left"><code class="filename">cstdlib</code></td><td align="left"><code class="filename">cstdio</code></td><td align="left"><code class="filename">cstring</code></td></tr><tr><td align="left"><code class="filename">ctgmath</code></td><td align="left"><code class="filename">ctime</code></td><td align="left"><code class="filename">cuchar</code></td><td align="left"><code class="filename">cwchar</code></td><td align="left"><code class="filename">cwctype</code></td></tr></tbody></table></div></div><br class="table-break" /><p> 25 In addition, TR1 includes as: 26</p><div class="table"><a id="table.tr1_headers"></a><p class="title"><strong>Table��3.6.��C++ TR 1 Library Headers</strong></p><div class="table-contents"><table summary="C++ TR 1 Library Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">tr1/array</code></td><td align="left"><code class="filename">tr1/complex</code></td><td align="left"><code class="filename">tr1/memory</code></td><td align="left"><code class="filename">tr1/functional</code></td><td align="left"><code class="filename">tr1/random</code></td></tr><tr><td align="left"><code class="filename">tr1/regex</code></td><td align="left"><code class="filename">tr1/tuple</code></td><td align="left"><code class="filename">tr1/type_traits</code></td><td align="left"><code class="filename">tr1/unordered_map</code></td><td align="left"><code class="filename">tr1/unordered_set</code></td></tr><tr><td align="left"><code class="filename">tr1/utility</code></td><td class="auto-generated">��</td><td class="auto-generated">��</td><td class="auto-generated">��</td><td class="auto-generated">��</td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="table.tr1_cheaders"></a><p class="title"><strong>Table��3.7.��C++ TR 1 Library Headers for C Library Facilities</strong></p><div class="table-contents"><table summary="C++ TR 1 Library Headers for C Library Facilities" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">tr1/ccomplex</code></td><td align="left"><code class="filename">tr1/cfenv</code></td><td align="left"><code class="filename">tr1/cfloat</code></td><td align="left"><code class="filename">tr1/cmath</code></td><td align="left"><code class="filename">tr1/cinttypes</code></td></tr><tr><td align="left"><code class="filename">tr1/climits</code></td><td align="left"><code class="filename">tr1/cstdarg</code></td><td align="left"><code class="filename">tr1/cstdbool</code></td><td align="left"><code class="filename">tr1/cstdint</code></td><td align="left"><code class="filename">tr1/cstdio</code></td></tr><tr><td align="left"><code class="filename">tr1/cstdlib</code></td><td align="left"><code class="filename">tr1/ctgmath</code></td><td align="left"><code class="filename">tr1/ctime</code></td><td align="left"><code class="filename">tr1/cwchar</code></td><td align="left"><code class="filename">tr1/cwctype</code></td></tr></tbody></table></div></div><br class="table-break" /><p>Decimal floating-point arithmetic is available if the C++ 27compiler supports scalar decimal floating-point types defined via 28<code class="code">__attribute__((mode(SD|DD|LD)))</code>. 29</p><div class="table"><a id="table.decfp_headers"></a><p class="title"><strong>Table��3.8.��C++ TR 24733 Decimal Floating-Point Header</strong></p><div class="table-contents"><table summary="C++ TR 24733 Decimal Floating-Point Header" border="1"><colgroup><col align="left" class="c1" /></colgroup><tbody><tr><td align="left"><code class="filename">decimal/decimal</code></td></tr></tbody></table></div></div><br class="table-break" /><p> 30 Also included are files for the C++ ABI interface: 31</p><div class="table"><a id="table.abi_headers"></a><p class="title"><strong>Table��3.9.��C++ ABI Headers</strong></p><div class="table-contents"><table summary="C++ ABI Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /></colgroup><tbody><tr><td align="left"><code class="filename">cxxabi.h</code></td><td align="left"><code class="filename">cxxabi_forced.h</code></td></tr></tbody></table></div></div><br class="table-break" /><p> 32 And a large variety of extensions. 33</p><div class="table"><a id="table.ext_headers"></a><p class="title"><strong>Table��3.10.��Extension Headers</strong></p><div class="table-contents"><table summary="Extension Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">ext/algorithm</code></td><td align="left"><code class="filename">ext/atomicity.h</code></td><td align="left"><code class="filename">ext/array_allocator.h</code></td><td align="left"><code class="filename">ext/bitmap_allocator.h</code></td><td align="left"><code class="filename">ext/cast.h</code></td></tr><tr><td align="left"><code class="filename">ext/codecvt_specializations.h</code></td><td align="left"><code class="filename">ext/concurrence.h</code></td><td align="left"><code class="filename">ext/debug_allocator.h</code></td><td align="left"><code class="filename">ext/enc_filebuf.h</code></td><td align="left"><code class="filename">ext/extptr_allocator.h</code></td></tr><tr><td align="left"><code class="filename">ext/functional</code></td><td align="left"><code class="filename">ext/iterator</code></td><td align="left"><code class="filename">ext/malloc_allocator.h</code></td><td align="left"><code class="filename">ext/memory</code></td><td align="left"><code class="filename">ext/mt_allocator.h</code></td></tr><tr><td align="left"><code class="filename">ext/new_allocator.h</code></td><td align="left"><code class="filename">ext/numeric</code></td><td align="left"><code class="filename">ext/numeric_traits.h</code></td><td align="left"><code class="filename">ext/pb_ds/assoc_container.h</code></td><td align="left"><code class="filename">ext/pb_ds/priority_queue.h</code></td></tr><tr><td align="left"><code class="filename">ext/pod_char_traits.h</code></td><td align="left"><code class="filename">ext/pool_allocator.h</code></td><td align="left"><code class="filename">ext/rb_tree</code></td><td align="left"><code class="filename">ext/rope</code></td><td align="left"><code class="filename">ext/slist</code></td></tr><tr><td align="left"><code class="filename">ext/stdio_filebuf.h</code></td><td align="left"><code class="filename">ext/stdio_sync_filebuf.h</code></td><td align="left"><code class="filename">ext/throw_allocator.h</code></td><td align="left"><code class="filename">ext/typelist.h</code></td><td align="left"><code class="filename">ext/type_traits.h</code></td></tr><tr><td align="left"><code class="filename">ext/vstring.h</code></td><td class="auto-generated">��</td><td class="auto-generated">��</td><td class="auto-generated">��</td><td class="auto-generated">��</td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="table.debug_headers"></a><p class="title"><strong>Table��3.11.��Extension Debug Headers</strong></p><div class="table-contents"><table summary="Extension Debug Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">debug/bitset</code></td><td align="left"><code class="filename">debug/deque</code></td><td align="left"><code class="filename">debug/list</code></td><td align="left"><code class="filename">debug/map</code></td><td align="left"><code class="filename">debug/set</code></td></tr><tr><td align="left"><code class="filename">debug/string</code></td><td align="left"><code class="filename">debug/unordered_map</code></td><td align="left"><code class="filename">debug/unordered_set</code></td><td align="left"><code class="filename">debug/vector</code></td><td class="auto-generated">��</td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="table.profile_headers"></a><p class="title"><strong>Table��3.12.��Extension Profile Headers</strong></p><div class="table-contents"><table summary="Extension Profile Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><tbody><tr><td align="left"><code class="filename">profile/bitset</code></td><td align="left"><code class="filename">profile/deque</code></td><td align="left"><code class="filename">profile/list</code></td><td align="left"><code class="filename">profile/map</code></td></tr><tr><td align="left"><code class="filename">profile/set</code></td><td align="left"><code class="filename">profile/unordered_map</code></td><td align="left"><code class="filename">profile/unordered_set</code></td><td align="left"><code class="filename">profile/vector</code></td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="table.parallel_headers"></a><p class="title"><strong>Table��3.13.��Extension Parallel Headers</strong></p><div class="table-contents"><table summary="Extension Parallel Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /></colgroup><tbody><tr><td align="left"><code class="filename">parallel/algorithm</code></td><td align="left"><code class="filename">parallel/numeric</code></td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.headers.mixing"></a>Mixing Headers</h3></div></div></div><p> A few simple rules. 34</p><p>First, mixing different dialects of the standard headers is not 35possible. It's an all-or-nothing affair. Thus, code like 36</p><pre class="programlisting"> 37#include <array> 38#include <functional> 39</pre><p>Implies C++11 mode. To use the entities in <array>, the C++11 40compilation mode must be used, which implies the C++11 functionality 41(and deprecations) in <functional> will be present. 42</p><p>Second, the other headers can be included with either dialect of 43the standard headers, although features and types specific to C++11 44are still only enabled when in C++11 compilation mode. So, to use 45rvalue references with <code class="code">__gnu_cxx::vstring</code>, or to use the 46debug-mode versions of <code class="code">std::unordered_map</code>, one must use 47the <code class="code">std=gnu++11</code> compiler flag. (Or <code class="code">std=c++11</code>, of course.) 48</p><p>A special case of the second rule is the mixing of TR1 and C++11 49facilities. It is possible (although not especially prudent) to 50include both the TR1 version and the C++11 version of header in the 51same translation unit: 52</p><pre class="programlisting"> 53#include <tr1/type_traits> 54#include <type_traits> 55</pre><p> Several parts of C++11 diverge quite substantially from TR1 predecessors. 56</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.headers.cheaders"></a>The C Headers and <code class="code">namespace std</code></h3></div></div></div><p> 57 The standard specifies that if one includes the C-style header 58 (<math.h> in this case), the symbols will be available 59 in the global namespace and perhaps in 60 namespace <code class="code">std::</code> (but this is no longer a firm 61 requirement.) On the other hand, including the C++-style 62 header (<cmath>) guarantees that the entities will be 63 found in namespace std and perhaps in the global namespace. 64 </p><p> 65Usage of C++-style headers is recommended, as then 66C-linkage names can be disambiguated by explicit qualification, such 67as by <code class="code">std::abort</code>. In addition, the C++-style headers can 68use function overloading to provide a simpler interface to certain 69families of C-functions. For instance in <cmath>, the 70function <code class="code">std::sin</code> has overloads for all the builtin 71floating-point types. This means that <code class="code">std::sin</code> can be 72used uniformly, instead of a combination 73of <code class="code">std::sinf</code>, <code class="code">std::sin</code>, 74and <code class="code">std::sinl</code>. 75</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.headers.pre"></a>Precompiled Headers</h3></div></div></div><p>There are three base header files that are provided. They can be 76used to precompile the standard headers and extensions into binary 77files that may then be used to speed up compilations that use these headers. 78</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>stdc++.h</p><p>Includes all standard headers. Actual content varies depending on 79<a class="link" href="using.html#manual.intro.using.flags" title="Command Options">language dialect</a>. 80</p></li><li class="listitem"><p>stdtr1c++.h</p><p>Includes all of <stdc++.h>, and adds all the TR1 headers. 81</p></li><li class="listitem"><p>extc++.h</p><p>Includes all of the Extension headers 82(and in C++98 mode also adds all the TR1 headers by including all of 83<stdtr1c++.h>). 84</p></li></ul></div><p>To construct a .gch file from one of these base header files, 85first find the include directory for the compiler. One way to do 86this is:</p><pre class="programlisting"> 87g++ -v hello.cc 88 89#include <...> search starts here: 90 /mnt/share/bld/H-x86-gcc.20071201/include/c++/4.3.0 91... 92End of search list. 93</pre><p>Then, create a precompiled header file with the same flags that 94will be used to compile other projects.</p><pre class="programlisting"> 95g++ -Winvalid-pch -x c++-header -g -O2 -o ./stdc++.h.gch /mnt/share/bld/H-x86-gcc.20071201/include/c++/4.3.0/x86_64-unknown-linux-gnu/bits/stdc++.h 96</pre><p>The resulting file will be quite large: the current size is around 97thirty megabytes. </p><p>How to use the resulting file.</p><pre class="programlisting"> 98g++ -I. -include stdc++.h -H -g -O2 hello.cc 99</pre><p>Verification that the PCH file is being used is easy:</p><pre class="programlisting"> 100g++ -Winvalid-pch -I. -include stdc++.h -H -g -O2 hello.cc -o test.exe 101! ./stdc++.h.gch 102. /mnt/share/bld/H-x86-gcc.20071201/include/c++/4.3.0/iostream 103. /mnt/share/bld/H-x86-gcc.20071201include/c++/4.3.0/string 104</pre><p>The exclamation point to the left of the <code class="code">stdc++.h.gch</code> listing means that the generated PCH file was used.</p><p></p><p> Detailed information about creating precompiled header files can be found in the GCC <a class="link" href="http://gcc.gnu.org/onlinedocs/gcc/Precompiled-Headers.html" target="_top">documentation</a>. 105</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="using.html">Prev</a>��</td><td width="20%" align="center"><a accesskey="u" href="using.html">Up</a></td><td width="40%" align="right">��<a accesskey="n" href="using_macros.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter��3.��Using��</td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top">��Macros</td></tr></table></div></body></html>