All, I am experimenting boost for some specific requirement. The following code fails to retrieve the values. Could any one of you help me find out my mistake with the below code? #include <boost/multi_index_container.hpp> #include <boost/multi_index/ordered_index.hpp> #include <boost/multi_index/member.hpp> #include <boost/multi_index/composite_key.hpp> struct Elem_entry { unsigned int faceid; unsigned int node1; unsigned int node2; Elem_entry(const Elem_entry &obj){/*std::cout<<"copy const"<<std::endl;*/} Elem_entry():faceid(0),node1(0),node2(0){/*std::cout<<"defa const"<<std::endl;*/} Elem_entry(unsigned int faceid, unsigned int node1, unsigned int node2): faceid(faceid),node1(node1),node2(node2){} }; typedef multi_index_container< Elem_entry, indexed_by< //non-unique as some might have more than ids ordered_unique< composite_key< Elem_entry, member<Elem_entry,unsigned int,&Elem_entry::node1>, member<Elem_entry,unsigned int,&Elem_entry::node2> > >, ordered_unique< member<Elem_entry,unsigned int,&Elem_entry::faceid> >

elementbook;

int main() { elementbook pb; Elem_entry fc1 = Elem_entry(1,1,2); pb.insert(fc1); Elem_entry fc2 = Elem_entry(2,2,3); pb.insert(fc2); Elem_entry fc3 = Elem_entry(3,3,1); pb.insert(fc3); int faceId = 0; elementbook::iterator it; //Below code not working it = pb.find(boost::make_tuple(2,3)); if(it != pb.end()) { faceId = it->faceid; bool valid = true; valid = false; } for (elementbook::iterator iter = pb.begin(), i_end = pb.end(); iter != i_end; iter = pb.upper_bound(iter->faceid)) { std::cout<<iter->faceid<<"\t"<<iter->node1<<"\t"<<iter->node2<<std::endl ; } }