Sorry, I should have been clearer. This is exactly the code that doesn't work for me, with no namespace qualification of 'bind'. I'm guessing that the use of a Boost.Function as an argument to bind causes the bind in the boost namespace to be considered, as well the bind in the boost::lambda namespace which is considered because of the use of Boost.Lambda placeholders. I just can't think of a tidy solution. Thx - Rob. #include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <boost/function.hpp> #include <boost/range.hpp> #include <vector> #include <numeric> // and also this... #include <boost/bind.hpp> struct X { int f( ) const { return 1; } }; int sum( int a, int b ) { return a + b; } int main( ) { boost::lambda::placeholder1_type x; boost::lambda::placeholder2_type y; std::vector<X> v; boost::function<int(int, int)> my_sum = bind( sum, x, y ); std::accumulate( boost::begin( v ), boost::end( v ), 0, bind( my_sum, x, bind( &X::f, y ) ) ); }