How to copy one boost graph into another ( Deep Copy ) with all custom properties?

I have a boost graph with custom properties. I want to make a copy of it. I tried it by following way but got many compilation error.

Here is what I did :

using BGType = boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS,
                                     // Vertex Properties...
                                     vertexProps,
                                     // Edge Propereties...
                                     edgeProps,
                                     // Graph Properties
                                     graphProps>;

vertexProps.h

class vertexProps {
   public:
    explicit vertexProps(const std::string *moduleName = nullptr, const std::string *name = nullptr,
                            long refPtr = 0 )
     : _refPtr(refPtr),
    {
        _moduleName = moduleName ? *moduleName : "";
        _name = name ? *name : "";
    };


struct CustomVertexCopy {
    void operator()(const vertexProps& source_vertex, vertexProps& target_vertex) const {
        target_vertex._refPtr = source_vertex._refPtr;
        target_vertex._moduleName = source_vertex._moduleName;
        target_vertex._name = source_vertex._name;
}

edgeProps.h

class edgeProps {
   public:
    explicit edgeProps(std::string name = "")
        : _name(name){};
    std::string _name;
};

struct CustomEdgeCopy {
    void operator()(const edgeProps& source_edge, edgeProps& target_edge) const {
        target_edge._name = source_edge._name;
    }
};

someFunction.cpp

OnClick(BGType* bGraph)
{
   // some code
  BGType* oldBg = new BGType;
  boost::copy_graph(bGraph, oldBg, boost::vertex_copy(CustomVertexCopy()));
  boost::copy_graph(bGraph, oldBg, boost::edge_copy(CustomEdgeCopy()));
  // some code
}

Where am I wrong ?

I have a one more doubt.
Will such deep copying impact on performance if grpah is big ? If yes, is there any way to avoid it ?