Ok, sorry for the noise... composite_key expects the result_type as the first parameter and I did not specify it...<div><br></div><div><br></div><div>Anyway thanks to all answers!</div><div><br></div><div><br><br><div class="gmail_quote">

On Fri, Sep 2, 2011 at 3:07 PM, Ovanes Markarian <span dir="ltr">&lt;<a href="mailto:om_boost@keywallet.com">om_boost@keywallet.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

<span style="font-family:arial, sans-serif;font-size:13px;background-color:rgb(255, 255, 255)">Hello *,<div><br></div><div>I try to use a multi_index container with a composite key. The container is defined as follows:</div>


<div><br></div><div><div>  struct index_data</div><div>  {</div><div>    entry_header header; //has various public fields one of them is timestamp_</div><div>    fs::entry entry;</div><div>    bool masked;</div><div>  };</div>


<div><br></div><div>  typedef size_t timestamp_t; //in reallity this type is a class, but the error can be reproduced with this typedef as well</div><div><br></div><div>  timestamp_t const&amp; timestamp(index_data const&amp; data)</div>


<div>  {</div><div>    return data.header.timestamp_;</div><div>  }</div></div><div><br></div><div><div>  bool mask_state(index_data const&amp; data)</div><div>  {</div><div>    return data.masked;</div><div>  }</div><div>


<br></div><div> struct entry_data_tag {};</div><div><br></div><div>  typedef mi::multi_index_container</div><div>  &lt; index_data,</div><div>    mi::indexed_by</div><div>    &lt; mi::ordered_non_unique</div><div>      &lt; mi::tag&lt;entry_data_tag&gt;</div>


<div>      , mi::composite_key</div><div>        &lt; mi::global_fun&lt;index_data const&amp;, bool, &amp;mask_state&gt; //this could be a direct member reference, but I intially used fusion::map and reduced the problem to minimum</div>


<div>        , mi::global_fun&lt;index_data const&amp;, timestamp_t const&amp;, &amp;timestamp&gt;</div><div>        &gt;</div><div>      &gt;</div><div>    &gt;</div><div>  &gt; entry_index;</div><div><br></div></div><div>


<div>  typedef entry_index::index&lt;entry_data_tag&gt;::type entry_data;</div><div><br></div><div><br></div><div>  void mask_all()</div><div>  {</div><div>    using namespace boost::lambda;</div><div>    entry_data&amp; entries = pimpl_-&gt;indexed;</div>


<div><br></div><div>    entries.find(boost::make_tuple(false)); //!!!! this line results in an error novel by gcc 4.3</div><div>  }</div><div><br></div><div><br></div><div>The error description is:</div><div>multi_index/composite_key.hpp:638: error: no match for &#39;operator*&#39; in &#39;*x&#39;</div>


<div><br></div><div>Does anyone have some suggestions why that happens?</div><div><br></div><div><br></div><div>With Kind Regards,</div><div>Ovanes</div></div></span>
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