我有三个版本，只是使用Boost，使用std::ranges和使用Range-v3。
为了简化，我总是写boost::make_iterator_range(out_edges(e, g))，它工作得很好，可以把这对当作一个范围：

Just Boost

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

using Graph = boost::adjacency_list<boost::listS, boost::vecS, boost::directedS>;

int main() {
    Graph g;

    add_edge(0, 1, g);
    add_edge(1, 2, g);
    add_edge(1, 3, g);
    add_edge(1, 4, g);
    add_edge(2, 5, g);
    add_edge(3, 6, g);

    for (auto v : boost::make_iterator_range(vertices(g))) {
        std::cout << v << " ->";
        for (auto e : make_iterator_range(out_edges(v, g))) {
            std::cout << " " << e;
        }
        std::cout << "\n";
    }
}

有时候你可能需要

#include <boost/range/iterator_range.hpp>`

std::ranges

在C++20中，可以使用std：：ranges：

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

using Graph = boost::adjacency_list<boost::listS, boost::vecS, boost::directedS>;

int main() {
    Graph g;

    add_edge(0, 1, g);
    add_edge(1, 2, g);
    add_edge(1, 3, g);
    add_edge(1, 4, g);
    add_edge(2, 5, g);
    add_edge(3, 6, g);

    auto [vb,ve] = vertices(g);
    for (auto v : std::ranges::subrange(vb, ve)) {
        std::cout << v << " ->";
        auto [eb, ee] = out_edges(v, g);
        for (auto e : std::ranges::subrange(eb, ee)) {
            std::cout << " " << e;
        }
        std::cout << "\n";
    }
}

Range-V3

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#include <boost/graph/adjacency_list.hpp>
#include <iostream>
#include <range/v3/all.hpp>
namespace r = ::ranges::v3;

using Graph = boost::adjacency_list<boost::listS, boost::vecS, boost::directedS>;

int main() {
    Graph g;

    add_edge(0, 1, g);
    add_edge(1, 2, g);
    add_edge(1, 3, g);
    add_edge(1, 4, g);
    add_edge(2, 5, g);
    add_edge(3, 6, g);

    auto [vb,ve] = vertices(g);
    for (auto v : r::subrange(vb, ve)) {
        std::cout << v << " ->";
        auto [eb, ee] = out_edges(v, g);
        for (auto e : r::subrange(eb, ee)) {
            std::cout << " " << e;
        }
        std::cout << "\n";
    }
}

所有三个代码样本具有相同的输出：

0 -> (0,1)
1 -> (1,2) (1,3) (1,4)
2 -> (2,5)
3 -> (3,6)
4 ->
5 ->
6 ->