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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>STLport: Wrappers Technique</title><link href="doc.css" type="text/css" rel="stylesheet"></head><body marginwidth="0" marginheight="0" leftmargin="0" topmargin="0" vlink="#314A30" link="#314A30" text="black" bgcolor="white"><table border="0" cellspacing="0" cellpadding="0"><tr valign="top" align="left"><td width="24"><img src="images/trans.gif" border="0" height="1" width="24"></td><td width="776"><img border="0" height="14" width="1" src="images/trans.gif"><br><a href="../index.html"><img src="images/stl_logo_doc.gif" border="0" height="80" width="80"></a><a href="http://www.stlport.com"><img border="0" height="80" width="461" src="images/t_doc2.gif"></a><br><img src="images/trans.gif" border="0" height="24" width="1"><br><img src="images/black.gif" border="0" height="1" width="776"><br><img src="images/trans.gif" border="0" height="24" width="1"></td></tr><tr valign="top" align="left"><td width="24"><img src="images/trans.gif" border="0" height="1" width="24"></td><td width="776"><img src="images/trans.gif" border="0" height="10" width="776"></td></tr><tr valign="top" align="left"><td width="24"><img src="images/trans.gif" border="0" height="1" width="24"></td><td width="776">
<span class="heading">Wrapper Technique in STLport</span>
<p>
Considerable point of non-portability was the lack of default
template class parameters in many compilers. C++ template syntax doesn't
allow an easy way to hide that behind any macro magic.
<br>STLport uses wrapper technique to work around that:<br>
Full functionality for <i>'container'</i> is implemented via class <i>'__container__'</i>.
</p>
<p>For example:</p>
<pre><tt>#ifdef _STLP_DEFAULT_TYPE_PARAM
template &lt;class T, class Alloc = alloc&gt;
#else
#&nbsp; define vector __vector
template &lt;class T, class Alloc&gt;
#endif
class vector {
public:
......
#ifdef _STLP_DEFAULT_TYPE_PARAM
define __vector__ vector
# else
template &lt;class T&gt;
class vector : public __vector__&lt;T,alloc&gt;&nbsp;
{
.....
#define __vector__ __vector
# endif /* _STLP_DEFAULT_TYPE_PARAM */</tt></pre>
So, you are provided with two versions of container: with and without
default parameters. It buys you a way to access full functionality while
not breaking code using the short notation. <br>
If you wish to specify the allocator parameter, use <tt>__vector__</tt>.
For default alloc parameter, use <tt>vector</tt>. <br>
I would recommend that you <tt>#define</tt> some alias for <tt>__vector__</tt>,
to be able to switch easily. <br>
If you don't use different allocators, don't bother.
<p><b>New in STLport 3.2:</b><br>
<tt>_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS</tt> switch is introduced for user to take control
of wrappers behavior with classes that have more than one default template argument. With this switch defined,
STLport will use minimum set of default arguments on template classes that have more than one -
for example map&lt;&gt;, set&lt;&gt;.
This is supposed to help compiling existing standard code which use shortest notation.</p>
<p>Here is the list of compilers that cannot handle <b>dependant</b>
default template parameters:<br>
SunPro CC, BC++ 4.52, VC++ 4.2, xlC 3.1.4, DEC C++ 5.5, Visual Age C++
3.0.</p>
</td></tr><tr valign="top" align="left"><td width="24"><img src="images/trans.gif" border="0" height="1" width="24"></td><td width="776"><img src="images/trans.gif" border="0" height="20" width="50"><br><a href="index.html">Table of Contents</a><br></td></tr><tr valign="top" align="left"><td width="24"><img src="images/trans.gif" border="0" height="1" width="24"></td><td width="776"><img src="images/trans.gif" border="0" height="40" width="80"><br><img src="images/black.gif" border="0" height="1" width="776"></td></tr><tr valign="top" align="left"><td width="24"><img src="images/trans.gif" border="0" height="1" width="24"></td><td width="776"><img src="images/black.gif" border="0" height="1" width="776"></td></tr><tr valign="top" align="left"><td width="24"><img src="images/trans.gif" border="0" height="1" width="24"></td><td width="776"><img src="images/trans.gif" border="0" height="5" width="50"><br><span class="copyright">Copyright 2001 by STLport</span><br><img src="images/trans.gif" border="0" height="50" width="80"></td></tr></table></body></html>