boost :: read_graphviz - 如何读出属性？

Question

我试图从Graphviz DOT文件中读取图形.我对Vertex的两个属性感兴趣 - 它的id和外围.A还想加载图形标签.

我的代码看起来像这样:

struct DotVertex {
    std::string name;
    int peripheries;
};

struct DotEdge {
    std::string label;
};

typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS,
        DotVertex, DotEdge> graph_t;

    graph_t graphviz;
    boost::dynamic_properties dp;

    dp.property("node_id", boost::get(&DotVertex::name, graphviz));
    dp.property("peripheries", boost::get(&DotVertex::peripheries, graphviz));
    dp.property("edge_id", boost::get(&DotEdge::label, graphviz));

    bool status = boost::read_graphviz(dot, graphviz, dp);

我的示例DOT文件如下所示:

digraph G {
  rankdir=LR
  I [label="", style=invis, width=0]
  I -> 0
  0 [label="0", peripheries=2]
  0 -> 0 [label="a"]
  0 -> 1 [label="!a"]
  1 [label="1"]
  1 -> 0 [label="a"]
  1 -> 1 [label="!a"]
}

当我运行它时,我得到异常"Property not found:label".我究竟做错了什么？

Answer 1

您没有为"label"定义(动态)属性映射.

使用ignore_other_properties或定义它:)

在样品下面,使用ignore_other_properties需要防止rankdir(图表属性)和width,style(顶点属性):

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#include <boost/graph/graphviz.hpp>
#include <libs/graph/src/read_graphviz_new.cpp>
#include <iostream>

struct DotVertex {
    std::string name;
    std::string label;
    int peripheries;
};

struct DotEdge {
    std::string label;
};

typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS,
        DotVertex, DotEdge> graph_t;

int main() {
    graph_t graphviz;
    boost::dynamic_properties dp(boost::ignore_other_properties);

    dp.property("node_id",     boost::get(&DotVertex::name,        graphviz));
    dp.property("label",       boost::get(&DotVertex::label,       graphviz));
    dp.property("peripheries", boost::get(&DotVertex::peripheries, graphviz));
    dp.property("label",       boost::get(&DotEdge::label,         graphviz));

    bool status = boost::read_graphviz(std::cin, graphviz, dp);
    return status? 0 : 255;
}

哪个成功运行

有关使用的更多说明,请参见此处dynamic_properties:Boost :: Graph中的read_graphviz(),传递给构造函数