OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

index.html: Add tip about namespace for extensions. 

2002-11-28  Jonathan Wakely  <redi@gcc.gnu.org>
	* docs/html/faq/index.html: Add tip about namespace for extensions.

From-SVN: r59613
This commit is contained in:
Jonathan Wakely 2002-11-28 19:15:04 +00:00
parent 7957fde4e8
commit fbc3fee390
2 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,6 @@
2002-11-28 Jonathan Wakely <redi@gcc.gnu.org>
* docs/html/faq/index.html: Add tip about a namespace for extensions.
2002-11-28 Paolo Carlini <pcarlini@unitus.it>
Nathan Myers <ncm@cantrip.org>

28
libstdc++-v3/docs/html/faq/index.html
View File

@ -877,6 +877,34 @@ http://clisp.cons.org/~haible/gccinclude-glibc-2.2-compat.diff
that of other headers whose directories are not searched directly,
e.g., <code>&lt;sys/stat.h&gt;</code>, <code>&lt;X11/Xlib.h&gt;</code>.
</p>
<p>The extensions are no longer in the global or <code>std</code>
namespaces, instead they are declared in the <code>__gnu_cxx</code>
namespace. For maximum portability, consider defining a namespace
alias to use to talk about extensions, e.g.:
</p>
<pre>
#ifdef __GNUC__
#if __GNUC__ &lt; 3
#include &lt;hash_map.h&gt;
namespace Sgi { using ::hash_map; }; // inherit globals
#else
#include &lt;ext/hash_map&gt;
#if __GNUC_MINOR__ == 0
namespace Sgi = std; // GCC 3.0
#else
namespace Sgi = ::__gnu_cxx; // GCC 3.1 and later
#endif
#endif
#else // ... there are other compilers, right?
namespace Sgi = std;
#endif
Sgi::hash_map&lt;int,int&gt; my_map; </pre>
<p>This is a bit cleaner than defining typedefs for all the
instantiations you might need.
</p>
<p>Extensions to the library have
<a href="../ext/howto.html">their own page</a>.
</p>