Hi, I have code which uses Boost lambda in a template like this: template<class T> bool lessThanXY( T& src, T& dest ) { return (src.getY() < dest.getY()); } template<class T1, class T2> void sortXY(T1& list) { ::sort( list.begin(), list.end(), bind(::lessThanXY<T2>, *(_1), *(_2) ) ); } But when I instantiate the template like this, I get the following compile error: class Rect; typedef list<Rect*> RectList; void sortXYRectList(RectList& rl) { sortXYWithThreshold<RectList, Rect>(rl); } /usr/include/boost/lambda/detail/lambda_traits.hpp:389: error: ignoring 'const' qualifiers added to function type 'bool ()(Rect&, Rect&)const' gmake[5]: *** [RectUtils.o] Error 1 Can you please tell me how to fix my problem ? I did not use 'const' anywhere in my template, why I get this error: error: ignoring 'const' qualifiers added to function type 'bool ()(Rect&, Rect&)const'