Question

这是一个完整的代码片段，用于复制带有捆绑属性的图形，但会导致一堆编译器错误。解决这些问题需要什么？

struct NodeInfo1    {};
struct EdgeInfo1 {};

typedef boost::labeled_graph< boost::adjacency_list<
    boost::vecS, boost::vecS, boost::undirectedS, NodeInfo1, EdgeInfo1>,
    std::string> Graph1;

typedef std::pair<boost::graph_traits<Graph>::edge_descriptor, bool> Edge;


void TestCases::TestCopyGraph()
{
    Graph1 grid, g1;
    EdgeInfo1 ei;

    Edge e = add_edge_by_label("A", "B", ei, grid);
    copy_graph(grid, g1);
}

Answer 1

这有点歪曲了这个问题。你不是实际上复制邻接列表，你正在复制labeled_graph适配器，这恰好不符合copy_graph所要求的概念：

/** @name Labeled Mutable Graph
 * The labeled mutable graph hides the add_ and remove_ vertex functions from
 * the mutable graph concept. Note that the remove_vertex is hidden because
 * removing the vertex without its key could leave a dangling reference in
 * the map.
 */

这里是复制adjacency_list：¹

typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, NodeInfo1, EdgeInfo1> AList;
typedef boost::labeled_graph<AList, std::string> Graph;

void TestCopyGraph()
{
    std::string names[3] = { "A", "B", "C" };
    Graph grid(3, names);
    EdgeInfo1 ei;

    /*auto e =*/ add_edge_by_label("C", "B", ei, grid);

    AList g1;
    copy_graph(grid, g1);
}

复制标记的适配器

更容易。不需要copy_graph，只需复制构造对象：

#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/copy.hpp>
#include <boost/graph/labeled_graph.hpp>
#include <boost/graph/graph_utility.hpp>

struct NodeInfo1 { int i; };
struct EdgeInfo1 { int j; };

typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, NodeInfo1, EdgeInfo1> AList;
typedef boost::labeled_graph<AList, std::string> Graph;

auto TestCopyGraph()
{
    std::string names[3] = { "A", "B", "C" };
      NodeInfo1 props[3] = { {11}, {22}, {33} };
    Graph grid(3, names, props);
    /*auto e =*/ add_edge_by_label("C", "B", EdgeInfo1{17}, grid);

    Graph g1 = grid; // just copy-construct
    return g1;
}

int main() {
    auto copied = TestCopyGraph();

    print_graph(copied);

    // check that properties were copied: vertex B has NodeInfo1 22
    {
        auto pmap = boost::get(&NodeInfo1::i, copied);
        std::cout << "Vertex B NodeInfo1.i after copy: " << pmap[copied.vertex("B")] << "\n";
    }

    // edge properties too:
    for (auto e : boost::make_iterator_range(edges(copied)))
        std::cout << "Edge has property EdgeInfo1 " << copied[e].j << "\n";

    std::cout << "Removed A:\n";
    copied.remove_vertex("A");
    print_graph(copied);
}

打印

0 <--> 
1 <--> 2 
2 <--> 1 
Vertex B NodeInfo1.i after copy: 22
Edge has property EdgeInfo1 17
Removed A:
0 <--> 1 
1 <--> 0

¹请注意，由于labeled_graph中存在错误，您需要此修补程序：https://github.com/boostorg/graph/pull/58

copy_graph - adjacency_list，带有捆绑属性

1 个答案:

复制标记的适配器