在boost :: bimap中将值添加到多集 [英] Add values to a multiset in a boost::bimap

问题描述

我想使用boost :: bimap的多图版本，并且我正在遵循此方法，

I wanted to use a multimap version of a boost::bimap and I am following this,

Boost :: Bimap等同于双向多图

这显示了如何在结构中添加和检索值.我试图根据右侧的值进行查找，该值映射到左侧的多个值，如果找到，我想添加到左侧的列表中.例如，假设这是bimap，

This shows how to add and retrieve values in the structure. I am trying to look up based on a value on the right that maps to multiple values on the left, and if found, I would like to add to the list on the left. For example, assume, this is the bimap,

value_type(1, 1)
value_type(10, 50) 
value_type(1, 2)
value_type(9, 15)

以及执行bimap.left.equal_range(1);

and when you do a bimap.left.equal_range(1);

您得到

1=>1 1=>2

1=>1 1=>2

我想对其进行更新，使其也映射到3，即将3添加到列表中，以便下次完成bimap.left.equal_range(1);时，将是结果，

I would like to update it such that it also maps to 3, ie, add 3 to the list, so that next time when bimap.left.equal_range(1); is done, this would be the result,

1=>1 1=>2 1=>3

1=>1 1=>2 1=>3

如何获取右侧的列表，以便可以像上面提到的那样修改列表(而不是仅使用const迭代器，而是仅查看值).

How can I get the list on the right so that I can modify the list like mentioned above(instead of just a const iterator, to just view the values).

TIA

推荐答案

只需...添加它:

在Coliru上直播

#include <iostream>
#include <boost/bimap.hpp>
#include <boost/bimap/multiset_of.hpp>
#include <boost/bimap/set_of.hpp>
#include <boost/range/iterator_range.hpp>

namespace bimaps = boost::bimaps;

int main() {
    typedef boost::bimap<bimaps::multiset_of<int>, bimaps::set_of<int>> bimap_t;

    bimap_t m;

    m.insert({1, 1});
    m.insert({10, 50});
    m.insert({1, 2});
    m.insert({9, 15});

    for (auto p : boost::make_iterator_range(m.left.equal_range(1)))
        std::cout << p.second << " ";

    std::cout << "\nafter adding:\n";

    m.insert({1, 3});

    for (auto p : boost::make_iterator_range(m.left.equal_range(1)))
        std::cout << p.second << " ";

    std::cout << "\nafter removing:\n";

    m.right.erase(m.right.find(3));

    for (auto p : boost::make_iterator_range(m.left.equal_range(1)))
        std::cout << p.second << " ";
}

打印:

1 2 
after adding:
1 2 3 
after removing:
1 2 

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