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输出（对于GraphViz）Boost Graph顶点及其属性，使用捆绑属性作为具有私有变量的类

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我使用带有自定义类的boost有向图作为顶点的捆绑属性，并希望使用graphviz以DOT格式打印它 . 该类有一个私有变量，其值我想在DOT文件中出现 .

用于演示我的问题的示例代码：

#include <iostream>
#include <boost/graph/directed_graph.hpp>
#include <boost/graph/graphviz.hpp>
#include <boost/property_map/transform_value_property_map.hpp>

class VertexClass
{
public:
    VertexClass() { id = 12; }
    VertexClass( int newId ) { id = newId; }
    int get_id() { return id; }
    void set_id( int newId ) { id = newId; }
private:
    int id;
};

typedef boost::directed_graph<VertexClass, boost::no_property> Graph;

int main(int,char*[])
{
    Graph g;

    Graph::vertex_descriptor v0 = g.add_vertex(3);
    Graph::vertex_descriptor v1 = g.add_vertex(5);
    Graph::vertex_descriptor v2 = g.add_vertex(6);

    boost::add_edge(v0,v1,g);
    boost::add_edge(v1,v2,g);

    //boost::write_graphviz(std::cout, g, ...);

    return 0;
}

期望的输出：

digraph G {
0[label=3];
1[label=5];
2[label=6];
0->1 ;
1->2 ;
}

（通过将“id”公开并在代码下运行获得） .

现在，“id”是私有的，所以在代码下面（我发现阅读其他类似问题）对我不起作用：

boost::write_graphviz(std::cout, g, boost::make_label_writer(boost::get(&VertexClass::id, g)));

我想我必须使用访问器来获取id . 经过一些搜索，我发现有人建议使用值转换属性映射（make_transform_value_property_map） .

然后我找到this answer . 但问题是，在这种情况下，属性未定义为捆绑，而是使用枚举和BOOST_INSTALL_PROPERTY . 所以，因为我没有为我工作（或者至少我不知道如何让它这样做） .

接下来，在阅读this answer后，我尝试了以下方法：

boost::write_graphviz(std::cout, g, boost::make_label_writer(boost::make_transform_value_property_map(&VertexClass::get_id, boost::get(boost::vertex_bundle, g))));

但我得到以下错误（下面的完整输出）：

$ g++ -Wall -std=c++11 main.cpp
In file included from /usr/local/include/boost/graph/directed_graph.hpp:13:0,
                 from main.cpp:2:
/usr/local/include/boost/property_map/transform_value_property_map.hpp: In instantiation of ‘boost::transform_value_property_map<Func, PM, Ret>::reference boost::transform_value_property_map<Func, PM, Ret>::operator[](const key_type&) const [with Func = int (VertexClass::*)(); PM = boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>; Ret = int; boost::transform_value_property_map<Func, PM, Ret>::reference = int; boost::transform_value_property_map<Func, PM, Ret>::key_type = void*]’:
/usr/local/include/boost/property_map/property_map.hpp:303:54:   required from ‘Reference boost::get(const boost::put_get_helper<Reference, PropertyMap>&, const K&) [with PropertyMap = boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int>; Reference = int; K = void*]’
/usr/local/include/boost/graph/graphviz.hpp:85:56:   required from ‘void boost::label_writer<Name>::operator()(std::ostream&, const VertexOrEdge&) const [with VertexOrEdge = void*; Name = boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int>; std::ostream = std::basic_ostream<char>]’
/usr/local/include/boost/graph/graphviz.hpp:270:18:   required from ‘void boost::write_graphviz(std::ostream&, const Graph&, VertexPropertiesWriter, EdgePropertiesWriter, GraphPropertiesWriter, VertexID, typename boost::enable_if_c<boost::is_base_and_derived<boost::vertex_list_graph_tag, typename boost::graph_traits<Graph>::traversal_category>::value, boost::graph::detail::no_parameter>::type) [with Graph = boost::directed_graph<VertexClass, boost::no_property>; VertexPropertiesWriter = boost::label_writer<boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int> >; EdgePropertiesWriter = boost::default_writer; GraphPropertiesWriter = boost::default_writer; VertexID = boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, unsigned int, const unsigned int&, boost::vertex_index_t>; std::ostream = std::basic_ostream<char>; typename boost::enable_if_c<boost::is_base_and_derived<boost::vertex_list_graph_tag, typename boost::graph_traits<Graph>::traversal_category>::value, boost::graph::detail::no_parameter>::type = boost::graph::detail::no_parameter]’
/usr/local/include/boost/graph/graphviz.hpp:290:63:   required from ‘void boost::write_graphviz(std::ostream&, const Graph&, VertexPropertiesWriter, EdgePropertiesWriter, GraphPropertiesWriter, typename boost::enable_if_c<boost::is_base_and_derived<boost::vertex_list_graph_tag, typename boost::graph_traits<Graph>::traversal_category>::value, boost::graph::detail::no_parameter>::type) [with Graph = boost::directed_graph<VertexClass, boost::no_property>; VertexPropertiesWriter = boost::label_writer<boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int> >; EdgePropertiesWriter = boost::default_writer; GraphPropertiesWriter = boost::default_writer; std::ostream = std::basic_ostream<char>; typename boost::enable_if_c<boost::is_base_and_derived<boost::vertex_list_graph_tag, typename boost::graph_traits<Graph>::traversal_category>::value, boost::graph::detail::no_parameter>::type = boost::graph::detail::no_parameter]’
/usr/local/include/boost/graph/graphviz.hpp:309:38:   required from ‘void boost::write_graphviz(std::ostream&, const Graph&, VertexWriter, typename boost::enable_if_c<boost::is_base_and_derived<boost::vertex_list_graph_tag, typename boost::graph_traits<Graph>::traversal_category>::value, boost::graph::detail::no_parameter>::type) [with Graph = boost::directed_graph<VertexClass, boost::no_property>; VertexWriter = boost::label_writer<boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int> >; std::ostream = std::basic_ostream<char>; typename boost::enable_if_c<boost::is_base_and_derived<boost::vertex_list_graph_tag, typename boost::graph_traits<Graph>::traversal_category>::value, boost::graph::detail::no_parameter>::type = boost::graph::detail::no_parameter]’
main.cpp:30:166:   required from here
/usr/local/include/boost/property_map/transform_value_property_map.hpp:45:24: error: must use ‘.*’ or ‘->*’ to call pointer-to-member function in ‘((const boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int>*)this)->boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int>::f (...)’, e.g. ‘(... ->* ((const boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int>*)this)->boost::transform_value_property_map<int (VertexClass::*)(), boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, boost::property<boost::vertex_index_t, unsigned int, VertexClass>, boost::property<boost::edge_index_t, unsigned int, boost::no_property>, boost::no_property, boost::listS>, VertexClass, VertexClass&, boost::vertex_bundle_t>, int>::f) (...)’
     return f(get(pm, k));

我看到的每个问题/答案都是关于上面提到的两种情况之一（带有公共变量的捆绑属性（例如结构）或老式的属性声明） .

我是boost图库中的新手，所以我想我可能错过了一些东西 . 但我无法找到解决方案（并且在boost的文档中真的丢失了），所以任何帮助都会非常感激 .

c++ boost graphviz boost-graph

1 回答

  • 0

    transform_value_property_map 的包含向我表明您已接近解决方案 . 这里是：

    boost::dynamic_properties dp;

    首先，让我们声明你想要graphviz节点id的de intrinsic vertex索引：

    dp.property("node_id", get(boost::vertex_index, g));

    现在我们想要使用bundle做一些事情，所以让我们 grab 整个bundle的属性映射：

    auto vbundle = get(boost::vertex_bundle, g);

    但是我们不能直接使用它 . 我们需要改变它：

    dp.property("label", 
        boost::make_transform_value_property_map([](VertexClass const& vd) {
            return vd.get_id();
            }, vbundle));

    注意！我已经使get_id（）const常量来进行编译

    现在写：

    boost::write_graphviz_dp(std::cout, g, dp);

    结果：

    Live On Coliru

    digraph G {
0 [label=3];
1 [label=5];
2 [label=6];
0->1 ;
1->2 ;
}

    备选方案＃1

    在这种情况下，你 could 更简单：

    Live On Coliru

    dp.property("label", 
    boost::make_transform_value_property_map(std::mem_fn(&VertexClass::get_id), vbundle));

    而是更灵活的lambda

    备选方案＃2：没有准类

    你似乎陷入了要求准类（PDF）的陷阱，它们没有增加任何 Value . 简化：

    Live On Coliru

    #include <boost/graph/directed_graph.hpp>
#include <boost/graph/graphviz.hpp>
#include <iostream>

struct VertexProps { int id; };
typedef boost::directed_graph<VertexProps> Graph;

int main() {
    Graph g;
    auto v1 = add_vertex({5}, g);

    add_edge(add_vertex({3}, g), v1, g);
    add_edge(v1, add_vertex({6}, g), g);

    boost::dynamic_properties dp;
    dp.property("node_id", get(boost::vertex_index, g));
    dp.property("label", get(&VertexProps::id, g));

    write_graphviz_dp(std::cout, g, dp);
}

    正如您现在所看到的，整个事物缩小到20行代码，并为您的顶点属性提供一流的支持 .

    回复于

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