Hi, does anyone know whats wrong with this code. It doesn't compile on gcc-mingw 4.1.2. it works on msvc visual studio 2005. code: template <class InputIterator> typename InputIterator::difference_type kmean::getClusterIndex(InputIterator first, InputIterator last) { typedef typename InputIterator::value_type T; BOOST_STATIC_ASSERT(boost::is_floating_point<T>::value); #ifdef __DEBUG__ boost::prof::profiler p; #endif T min(std::numeric_limits<T>::max()); typedef typename InputIterator::difference_type diff_type; diff_type index(0); diff_type currentIndex(0); std::for_each(first, last, ( boost::lambda::if_then(boost::lambda::_1 < boost::lambda::var(min), ( boost::lambda::var(min) = boost::lambda::_1, boost::lambda::var(index) = boost::lambda::var(currentIndex) )), ++boost::lambda::var(currentIndex) ) ); #ifdef __DEBUG__ std::cerr << "finish getClusterIndex\n"; #endif return index; } error message: C:/Boost/include/boost/lambda/detail/lambda_functor_base.hpp: In member function 'boost::lambda::identity<ptrdiff_t&>& boost::lambda::identity<ptrdiff_t&>::operator=(const boost::lambda::identity<ptrdiff_t&>&)': C:/Boost/include/boost/lambda/detail/lambda_functor_base.hpp:23: instantiated from 'typename InputIterator::difference_type kmean::getClusterIndex(InputIterator, InputIterator) [with InputIterator = __gnu_cxx::__normal_iterator<double*, std::vector<double, std::allocator<double> > >]' ./cs522/c++/kmeanMain.cpp:70: instantiated from here C:/Boost/include/boost/lambda/detail/lambda_functor_base.hpp:23: error: non-static reference member 'ptrdiff_t& boost::lambda::identity<ptrdiff_t&>::elem', can't use default assignment operator C:/Boost/include/boost/lambda/detail/lambda_functors.hpp: In member function 'boost::lambda::lambda_functor<boost::lambda::identity<ptrdiff_t&> >& boost::lambda::lambda_functor<boost::lambda::identity<ptrdiff_t&>

::operator=(const boost::lambda::lambda_functor<boost::lambda::identity<ptrdiff_t&> >&)': C:/Boost/include/boost/lambda/detail/lambda_functors.hpp:113: note: synthesized method 'boost::lambda::identity<ptrdiff_t&>& boost::lambda::identity<ptrdiff_t&>::operator=(const boost::lambda::identity<ptrdiff_t&>&)' first required here ./cs522/c++/def/kmeandef.hpp: In function 'typename InputIterator::difference_type kmean::getClusterIndex(InputIterator, InputIterator) [with InputIterator = __gnu_cxx::__normal_iterator<double*, std::vector<double, std::allocator<double> > >]': ./cs522/c++/def/kmeandef.hpp:406: note: synthesized method 'boost::lambda::lambda_functor<boost::lambda::identity<ptrdiff_t&> >& boost::lambda::lambda_functor<boost::lambda::identity<ptrdiff_t&> ::operator=(const boost::lambda::lambda_functor<boost::lambda::identity<ptrdiff_t&> >&)' first required here make: *** [project/kmeanMain.o] Error 1