I have code that will compile using msvc 7.1 but will not under intel 9.0. Here is some simplified code to illustrate my problem: using namespace boost; using namespace std; typedef array<int, 2> array_type; array_type a; a[0] = 0; a[1] = 1; vector<array_type> v; v.push_back(a); vector<int> h; for_each(v.begin(), v.end(), mem_fun_ref(&array_type::front)); This compiles and runs using msvc 7.1, but intel 9.0 errors with the following: error: more than one instance of overloaded function "mem_fun_ref" matches the argument list: function template "std::mem_fun_ref(_Result (_Ty::*)() const)" function template "std::mem_fun_ref(_Result (_Ty::*)())" argument types are: (<unknown-type>) Here are the two definitions of front for boost::array: reference front() { return elems[0]; } const_reference front() const { return elems[0]; } If I'm reading the error correctly, this means that the intel compiler doesn't know if I want to use the const or non-const version of front. Does anyone know anything about this? Is this the forwarding problem? Is a function wrapper around front a good solution? What are the solutions? Thanks, Chris