小编use*_*821的帖子

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 …

我有一段代码,它应该声明基础结构,然后声明继承它的模板结构.然后结构部分被证明.

#include <utility>
#include <iostream>

template<class A, class B>
struct Parent {
    std::pair<A, B> m_pair;
    void print() {
        std::cout << m_pair.first << ", " << m_pair.second << "\n";
    }
};

template <class A, class B>
struct Some : public Parent<A, B> {
    Some(A a, B b) : Parent<A, B>({ {a, b} }) {}
    void add() {
        m_pair.first += m_pair.second;
    }
};

template <class B>
struct Some<B, float> : public Parent<B, float> {
    Some(B a, float b) : Parent<B, float>({ {a, …