c++ - 不同 boost 图的相同权重

Question

我才发现，我还没有明白boost图库的使用方法。我有这段代码:

#include <iostream>
#include <boost/graph/adjacency_list.hpp>

using namespace std;
using namespace boost;

typedef unsigned int WeightType;

typedef adjacency_list<listS, vecS, bidirectionalS,
        no_property, property<edge_weight_t, WeightType>> Graph;

typedef graph_traits<Graph>::vertex_descriptor Vertex;
typedef graph_traits<Graph>::edge_descriptor Edge;

typedef property_map<Graph, edge_weight_t>::type WeightMap;
typedef property_map<Graph, edge_weight_t>::const_type ConstWeightMap;

const WeightType infinity = numeric_limits<WeightType>::max();

int main() {
    Graph g(4);
    Graph g2(4);

    for (uint i = 0; i < 3; ++i) {
        add_edge(i, i+1, i, g);
        add_edge(i, i+1, i*10, g2);
    }

    WeightMap m = get(edge_weight, g);
    WeightMap m2 = get(edge_weight, g2);

    for (auto e : make_iterator_range(edges(g))) {
        cout << m[e] << endl;
    }
    cout << endl;
    for (auto e : make_iterator_range(edges(g))) {
        cout << m2[e] << endl;
    }

}

我希望得到如下输出:“0 1 2 , 0 10 20”。但输出是“0 1 2, 0 1 2”。每个图都有它的权重属性图，不是吗？我的错误在哪里？

Answer 1

你在第二个 for 循环中打错了字:

for (auto e : make_iterator_range(edges(g))) {

应该是:

for (auto e : make_iterator_range(edges(g2))) {

因此，您将第一个图形的内容打印两次，而不是先打印再打印第二个。