Which parameter I should use to check for collision detection

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Hi,

I am using the fcl library to detect collisions between two objects I used the following code:

    bool flag = false ; 
    collisionObject co0(Shpere0, tf0);
    std::vector<CollisionObject*> boxes;
    generateBoxesFromOctomap(boxes, *st_tree);


           for(size_t i = 0; i < boxes.size(); ++i)
           {

               bool res2 = solver.shapeIntersect(*Shpere0, tf0, *boxes[i], tf1, &contact_points, &penetration_depth, &normal);
              static const int num_max_contacts = std::numeric_limits<int>::max();
              static const bool enable_contact = true;
              fcl::CollisionResult result;
              fcl::CollisionRequest request(num_max_contacts, enable_contact);
    //       flag = fcl::collide(&co0, &co1, request, result);
    //            OR 
    //       flag = res1 ;

      }

Which value is the right one ? I want if flag = true then there is a collision and if flag == false then there is no collision .. so which one is the write one ????

    //       flag = fcl::collide(&co0, &co1, request, result);
    //            OR 
    //       flag = res1