不同增强图的权重相同

时间:2015-06-12 18:11:08

标签: c++ boost boost-graph

我刚才意识到我还没有理解如何使用boost图库。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;
    }

}

我希望输出如:“0 1 2 0 10 20”。但输出为“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?

1 个答案:

答案 0 :(得分:2)

你在第二个for循环中输了一个拼写错误:

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

应该是:

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

所以你要打印第一张图的内容两次,而不是第一次,然后是第二次。