C++ Boost Graph Library:输出自定义顶点属性

Question

我正在努力让自定义属性编写器与BGL一起工作.

struct IkGraph_VertexProperty {
    int id_ ;
    int type_ ;
    std::pair<int,int> gaussians_ ; // Type of Joint, Ids of Gaussians
};


struct IkGraph_VertexPropertyTag
{
typedef edge_property_tag kind;
static std::size_t const num; 
};

std::size_t const IkGraph_VertexPropertyTag::num = (std::size_t)&IkGraph_VertexPropertyTag::num;

typedef property<IkGraph_VertexPropertyTag, IkGraph_VertexProperty> vertex_info_type;

...方法中定义的自定义图形

typedef adjacency_list<setS, vecS, bidirectionalS, vertex_info_type, IkGraph_EdgeProperty> TGraph ;
TGraph testGraph ;
std::ofstream outStr(filename) ;
write_graphviz(outStr, testGraph, OurVertexPropertyWriter<TGraph,IkGraph_VertexPropertyTag, IkGraph_VertexProperty>(testGraph));

...

template <class Graph, class VertexPropertyTag, class VertexProperty>
struct OurVertexPropertyWriter {

  OurVertexPropertyWriter(Graph &g_) : g(g_) {}

 template <class Vertex>
 void operator() (std::ostream &out, Vertex v) {

    VertexProperty p = get (VertexPropertyTag(), g, v);
      out << "[label=" << p.gaussians_.first << "]";

  }

 Graph &g;
};

这会产生错误流.

我真正想做的事情(并且不知道这是否可行)是能够概括这一点并传递哪些自定义属性/我想要输出.

Answer 1

我不会更正您的代码,因为我无法验证它是否会按预期工作.但是由于我遇到了同样的问题,我会将我的代码的相关部分作为您和其他人的示例发布.我希望这可能会有所帮助.

图的定义

typedef boost::adjacency_list<boost::vecS, 
                              boost::vecS, 
                              boost::bidirectionalS, 
                              boost::no_property, 
                              EdgeProp, //this is the type of the edge properties
                              boost::no_property, 
                              boost::listS> Graph;

边缘属性

struct EdgeProp
{
        char name;
        //...

};

边缘的属性作者

template <class Name>
class myEdgeWriter {
public:
     myEdgeWriter(Name _name) : name(_name) {}
     template <class VertexOrEdge>
     void operator()(std::ostream& out, const VertexOrEdge& v) const {
            out << "[label=\"" << name[v].name << "\"]";
     }
private:
     Name name;
};

必须事先将属性附加到边缘. 例如

EdgeProp p;
p.name = 'a';
g[edge_descriptor] = p;

调用boost来创建graphviz文件

myEdgeWriter<Graph> w(g);
ofstream outf("net.gv");
boost::write_graphviz(outf,g,boost::default_writer(),w);

对于顶点属性编写器,我们只使用默认编写器.