[Boost-users] A question on overloaded function? Can anyone with kindness help me?

I use Dev-C++,and the snipet of the program is: #pragma hdrstop # include <iostream> # include <vector> # include <iterator> # include "boost/math/common_factor.hpp" # include "boost/lambda/lambda.hpp" # include "boost/lambda/bind.hpp" # include "boost/lambda/if.hpp" # include "boost/lambda/casts.hpp" # include "boost/lambda/construct.hpp" # include "boost/lambda/loops.hpp" # include "boost/lambda/switch.hpp" # include "boost/tuple/tuple.hpp" # include "boost/tuple/tuple_comparison.hpp" # include <string> # include <map> using namespace std; using namespace boost::lambda; using namespace boost; void a(){ std::cout< IIPrimepair; std::vector<IIPrimepair> primepairvec; Can anyone with kindness help me?