Subject: [Boost-users] [BGL] Structure for BFSvisitor is in header file (visitor & property confusion)??
From: Trevor Bain (trevor.bain_at_[hidden])
Date: 2009-03-03 16:07:42
I have my graph working with BFS, and a BFSvisitor. But, I don't want the
BFSvisitor to be in the header file. Since, it is, I have to declare properties
I want to use in the visitor, but then I have to pass them in in the constructor
for the class that contains the graph and the visitor structure ...
Here is my visitor (in .hpp):
/* ... other code */
/*! Structure for creating BFSvisitor
*
* The property maps are being assigned in the constructor for the
* Ann object - I don't know how inneficient of a method that is.
* i.e. if I should be using references.
*/
struct propagate_node : public boost::base_visitor<propagate_node> {
// getting the dynamically created VoltageMap
boost::property_map<Digraph, vertex_voltage_t>::type voltmap;
boost::property_map<Digraph, vertex_input_t>::type inputmap;
boost::property_map<Digraph, vertex_output_t>::type outputmap;
typedef boost::on_discover_vertex event_filter;
/*
* This is a functor For Breadth First Visit.
*/
template <class Vertex, class Digraph>
void operator()(Vertex v, Digraph& G) {
boost::graph_traits<Digraph>::out_edge_iterator ed;
// getting the dynamically created VoltageMap && InputMap
double volt = boost::get(voltmap, v);
bool in = boost::get(inputmap, v);
bool out = boost::get(outputmap, v);
// mapping sigmoid (don't apply sigmoid to input/output layers)
if (in == false && out == false) {
// justify this sigmoid ???
volt = 1/(1+pow(MYEXP,-volt));
boost::put(voltmap, v, volt);
}
if (v != *vertices(G).first) {
for ( ed = boost::out_edges(v, G).first;
ed != boost::out_edges(v, G).second;
ed++)
{
boost::put( voltmap,
target(*ed, G),
get(voltmap,target(*ed,G))+get(boost::edge_weight,G,*ed)* volt);
}
}
}
} prop;
/* ... other code */
So in the c'tor I have to do (in .cpp):
/* ... in initializer list */
VoltageMap(get(vertex_voltage_t(), net)),
InputMap(get(vertex_input_t(), net)),
OutputMap(get(vertex_output_t(), net)),
/* ... other code */
prop.voltmap = VoltageMap;
prop.inputmap = InputMap;
prop.outputmap = OutputMap;
to pass my properties from the graph to the visitor ... there has to be a better
way to do this. How can I put the visitor definition into the .cpp, and only
declare it in the .hpp?