Good question. Since I don&#39;t have that compiler, I&#39;ve been unable to reproduce it.<div><br class="webkit-block-placeholder"></div><div>Is this:&nbsp;<span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68); ">error: error C2039: &#39;boost::get&#39;: Ist kein Element von &#39;boost::extensions::shared_library&#39;.</span></div>
<div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);"><br class="webkit-block-placeholder"></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);">The only error that you see?</span></div>
<div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);"><br class="webkit-block-placeholder"></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);">Please add the command line option /P to your build - this will output the preprocessed version of your file&nbsp;test_extension_and_optional.cpp. Then send this to me - I might be able to figure out what is going on. It looks like one of the preprocessor macros used by Boost.PreProcessor isn&#39;t working - I do have some ideas about what may cause the problem.</span></div>
<div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);"><br class="webkit-block-placeholder"></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);">See:&nbsp;<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; "><a href="http://support.microsoft.com/kb/134650">http://support.microsoft.com/kb/134650</a></span></span></div>
<div><br></div><div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);">What happens when you move boost/optional.hpp after the extension headers?</span></div><div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);"><br class="webkit-block-placeholder">
</span></div><div><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(51, 57, 68);">Jeremy<br></span><br><div class="gmail_quote">On Fri, Apr 18, 2008 at 8:01 AM, David Matz &lt;<a href="mailto:david.matz@spatialview.com">david.matz@spatialview.com</a>&gt; wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi,<br>
<br>
it seems that the problem concerns a specific compiler bug in microsoft compilers &lt;= 13.10.6030 (MSVC 7.1).<br>
<br>
The MSVC8 and g++ (4.1.2) compilers are able to build the code without errors.<div class="Ih2E3d"><br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8x;border-left:1px #ccc solid;padding-left:1ex">
#include &lt;boost/optional/optional.hpp&gt; &nbsp; &nbsp;// included for some reason<br>
#include &lt;boost/extension/shared_library.hpp&gt;<br>
#include &lt;boost/extension/convenience.hpp&gt; &nbsp; &nbsp;// load_single_library<br>
<br>
void loadExtension () {<br>
 &nbsp; &nbsp;boost::extensions::factory_map fm;<br>
 &nbsp; &nbsp;// we don&#39;t need the following line to produce the compiler error<br>
 &nbsp; &nbsp;//boost::extensions::load_single_library(fm, &quot;.&quot;, &quot;external_function_name&quot;);<br>
}<br>
</blockquote>
<br></div>
Any ideas how to get it to work with the good old Visual Studio 2003?<div><div></div><div class="Wj3C7c"><br>
<br>
-- <br>
David Matz<br>
----------------------------<br>
Software Developer<br>
Spatial View GmbH<br>
</div></div></blockquote></div><br></div>