Hi :<br><br>I'm just starting to use boost utility library and it seems very promising.&nbsp; I am trying to define a new multi_index type and gcc it's giving me error messages.<br><br>First I properly added the includes for boost::multi_index :
<br><br>#include &lt;boost/multi_index_container.hpp&gt;<br>#include &lt;boost/multi_index/mem_fun.hpp&gt;<br>#include &lt;boost/multi_index/hashed_index.hpp&gt;<br><br>then the includes for &quot;Item&quot; and &quot;ObjectId&quot; declarations:
<br><br>#include &quot;Item.h&quot;<br><br>following that appears this:<br><br>typedef multi_index_container&lt;<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; Item*,<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; indexed_by&lt;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; hashed_unique&lt;mem_fun&lt;Item, ObjectId, &amp;Item::getId&gt; &gt;<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &gt; ItemsContainer;<br><br>When I try to compile this code gcc reports the following errors:<br><br>error: 'mem_fun' was not declared in this scope<br>error: template argument 1 is invalid<br>error: type/value mismatch at argument 3 in template parameter list for 'template&lt;class Arg1, class Arg2, class Arg3, class Arg4&gt; struct boost::multi_index::hashed_unique'
<br>error:&nbsp;&nbsp; expected a type, got '&amp;emedia::lumiere::Item::getId'<br>error: template argument 1 is invalid<br>error: template argument 2 is invalid<br>error: expected unqualified-id before '&gt;' token<br><br>It seems that I'm forgetting something. It's very strange because I all ready compilled this code in another project but I can't find any difference with this one.
<br><br>Any idea.<br><br>Thanks in advance.<br><br>René<br><br><br>