Thorsten Ottosen wrote:
Perhaps. Try to replace std::vector<double> with boost::ptr_vector<double> in your tuple type.
Thank you Thorsten and Richard. As a coworker of mine would say when shown an obvious answer that was staring him in the face, "The printing was just too close to the page." I fixed the typedefs which allowed the test program to compile. Alas, I prudently used a typedef in my own application program when changing from std::map to boost::ptr_map. That typedef is correct. My minimal test example is not a true representation of my application program's problem. In the latter case when constructing the combining iterators, I'm getting: boost::detail::error_not_related_by_convertibility<T1,T2>' : base class undefined and 'type' : is not a member of 'boost::detail::minimum_category_impl<false,false>::apply<T1,T2> I'm going back in another attempt to decipher the error messages and perhaps construct a small example program which demonstrates the problem. -- Chuck