Hi, does anyone know whats wrong with this code. It doesn&#39;t compile on gcc-mingw 4.1.2. <br><br>it works on msvc visual studio 2005. <br><br>code:<br>template &lt;class InputIterator&gt;<br>typename InputIterator::difference_type kmean::getClusterIndex(InputIterator first, InputIterator last)
<br>{<br>&nbsp;&nbsp;&nbsp; typedef typename InputIterator::value_type T;<br>&nbsp;&nbsp;&nbsp; BOOST_STATIC_ASSERT(boost::is_floating_point&lt;T&gt;::value);<br>&nbsp;&nbsp;&nbsp; #ifdef __DEBUG__<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; boost::prof::profiler p;<br>&nbsp;&nbsp;&nbsp; #endif<br>&nbsp;&nbsp;&nbsp; T min(std::numeric_limits&lt;T&gt;::max());
<br>&nbsp;&nbsp;&nbsp; typedef typename InputIterator::difference_type diff_type;<br>&nbsp;&nbsp;&nbsp; diff_type index(0);<br>&nbsp;&nbsp;&nbsp; diff_type currentIndex(0);<br>&nbsp;&nbsp;&nbsp; std::for_each(first, last,<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; (<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; boost::lambda::if_then(boost::lambda::_1 &lt; boost::lambda::var(min),
<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; (<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; boost::lambda::var(min) = boost::lambda::_1,<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; boost::lambda::var(index) = boost::lambda::var(currentIndex)<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; )),<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ++boost::lambda::var(currentIndex)
<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; )<br>&nbsp;&nbsp;&nbsp; );<br>&nbsp;&nbsp;&nbsp; #ifdef __DEBUG__<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; std::cerr &lt;&lt; &quot;finish getClusterIndex\n&quot;;<br>&nbsp;&nbsp;&nbsp; #endif<br>&nbsp;&nbsp;&nbsp; return index;<br>}<br><br>error message: <br><br>C:/Boost/include/boost/lambda/detail/lambda_functor_base.hpp: In member function &#39;boost::lambda::identity&lt;ptrdiff_t&amp;&gt;&amp; boost::lambda::identity&lt;ptrdiff_t&amp;&gt;::operator=(const boost::lambda::identity&lt;ptrdiff_t&amp;&gt;&amp;)&#39;:
<br>C:/Boost/include/boost/lambda/detail/lambda_functor_base.hpp:23:&nbsp;&nbsp; instantiated from &#39;typename InputIterator::difference_type kmean::getClusterIndex(InputIterator, InputIterator) [with InputIterator = __gnu_cxx::__normal_iterator&lt;double*, std::vector&lt;double, std::allocator&lt;double&gt; &gt; &gt;]&#39;
<br>./cs522/c++/kmeanMain.cpp:70:&nbsp;&nbsp; instantiated from here<br>C:/Boost/include/boost/lambda/detail/lambda_functor_base.hpp:23: error: non-static reference member &#39;ptrdiff_t&amp; boost::lambda::identity&lt;ptrdiff_t&amp;&gt;::elem&#39;, can&#39;t use default assignment operator
<br>C:/Boost/include/boost/lambda/detail/lambda_functors.hpp: In member function &#39;boost::lambda::lambda_functor&lt;boost::lambda::identity&lt;ptrdiff_t&amp;&gt; &gt;&amp; boost::lambda::lambda_functor&lt;boost::lambda::identity&lt;ptrdiff_t&amp;&gt; &gt;::operator=(const boost::lambda::lambda_functor&lt;boost::lambda::identity&lt;ptrdiff_t&amp;&gt; &gt;&amp;)&#39;:
<br>C:/Boost/include/boost/lambda/detail/lambda_functors.hpp:113: note: synthesized method &#39;boost::lambda::identity&lt;ptrdiff_t&amp;&gt;&amp; boost::lambda::identity&lt;ptrdiff_t&amp;&gt;::operator=(const boost::lambda::identity&lt;ptrdiff_t&amp;&gt;&amp;)&#39; first required here 
<br>./cs522/c++/def/kmeandef.hpp: In function &#39;typename InputIterator::difference_type kmean::getClusterIndex(InputIterator, InputIterator) [with InputIterator = __gnu_cxx::__normal_iterator&lt;double*, std::vector&lt;double, std::allocator&lt;double&gt; &gt; &gt;]&#39;:
<br>./cs522/c++/def/kmeandef.hpp:406: note: synthesized method &#39;boost::lambda::lambda_functor&lt;boost::lambda::identity&lt;ptrdiff_t&amp;&gt; &gt;&amp; boost::lambda::lambda_functor&lt;boost::lambda::identity&lt;ptrdiff_t&amp;&gt; &gt;::operator=(const boost::lambda::lambda_functor&lt;boost::lambda::identity&lt;ptrdiff_t&amp;&gt; &gt;&amp;)&#39; first required here 
<br>make: *** [project/kmeanMain.o] Error 1<br>