std :: map :: insert(...)中的分段错误

Question

我用过搜索但是我找不到满足我的答案...所以......这是一大堆代码:

 //VoteContainer.h    
    typedef uint32_t order_id_t;
    typedef int driver_id_t;

    class Vote {

        public:
            enum DriverVoteResponse {YES, NO, TIMEOUT};

            struct DriverResponse {
                driver_id_t driver_id;
                time_t time;
                DriverVoteResponse response;
            };

            Vote() : m_order_id(0), m_time_until(0) {};
            Vote(order_id_t inOrderId, std::vector<driver_id_t> inPermittedDrivers, int inSeconds);
            Vote(const Vote & other) : m_order_id(other.m_order_id), m_time_until(other.m_order_id) {
                m_drivers_responses = other.m_drivers_responses;
                m_permitted_drivers = other.m_permitted_drivers;
            };

            virtual ~Vote() {};

            virtual void addDriverVote(driver_id_t inDriverId, DriverVoteResponse inDriverResponse);
            virtual void getAppropriateDriverId(driver_id_t * inDriverId); //with min response time

        private:

            order_id_t m_order_id;
            time_t m_time_until;
            std::vector<DriverResponse> m_drivers_responses;
            std::vector<driver_id_t> m_permitted_drivers;
        };

class VoteContainer {
public:

    VoteContainer() {};
    virtual ~VoteContainer() {};

    void registerVote(order_id_t inOrderId, std::vector<driver_id_t> inPermittedDrivers, int inSeconds);

private:
    std::map<order_id_t, Vote> m_votes;
};

以及我如何使用它:

//VoteContainer.cpp
void VoteContainer::registerVote(order_id_t inOrderId, std::vector<driver_id_t> inPermittedDrivers, int inSeconds) {
        m_votes.insert(std::make_pair(inOrderId,  Vote(inOrderId, inPermittedDrivers, inSeconds)));
    return;
};

无论我做什么,我都有段错误:

m_votes.insert(std::make_pair(inOrderId,  Vote(inOrderId, inPermittedDrivers, inSeconds)));

我首先尝试使用std :: map :: find(...),但我有相同的结果.回溯:

#0 0x41096a std::less<unsigned int>::operator() (this=0x407a59, __x=@0x7fffffff0b50, __y=@0x758948f87d894905) (/usr/include/c++/4.4/bits/stl_function.h:230)
#1 0x4105fb std::_Rb_tree<unsigned int, std::pair<unsigned int const, Vote>, std::_Select1st<std::pair<unsigned int const, Vote> >, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, Vote> > >::_M_insert_unique(this=0x407a59, __v=...) (/usr/include/c++/4.4/bits/stl_tree.h:1170)
#2 0x40fb25 std::map<unsigned int, Vote, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, Vote> > >::insert(this=0x407a59, __x=...) (/usr/include/c++/4.4/bits/stl_map.h:500)
#3 0x40f06f VoteContainer::registerVote(this=0x407a51, inOrderId=1, inPermittedDrivers=..., inSeconds=32) (/home/user/workspace/src/merit_your_name/VoteContainer.cpp:81)

我认为段错的原因是争论__y=@0x758948f87d894905.我不知道为什么会这样!那一刻m_votes地图是空的.拜托,建议我......

正如Matthieu M.所说,最可能的原因是未初始化的价值__y=@0x758948f87d894905,但是__y有类型order_id_t但不是Vote

我试图重写代码:

std::map<int, int> m_votes;

这并没有解决我的问题,因此,问题不在于我的类型......

这是代码调用registerVote()方法.

void OrderProcessor::processOrder(Order inOrder) {
    //test!!!
    driver_id_t driver_ids[] = {1,2};
    std::vector<driver_id_t> drivers(driver_ids, driver_ids + sizeof(driver_ids) / sizeof(driver_id_t) );

    m_vote_container->registerVote(inOrder.getId(), drivers, 32);

    for(size_t i = 0; i < drivers.size(); i++) {
        std::cout << "sending vote to " << drivers[i] << " driver. " << std::endl;
        std::cout << "send returns " << Arch::send_to_socket_nonblock((*m_drivers_connections)[drivers[i]], "<vote>1</vote>") << std::endl;
    }

    sleep(32);

    Vote vote = m_vote_container->getVote(inOrder.getId());
    vote.getAppropriateDriverId(driver_id);
    m_vote_container->deleteVote(inOrder.getId());
};

昨天,我发现我的代码中没有问题!我已经将std :: map替换为其他stl结构,但结果是一样的!我已经从该代码中删除了stl并且segfault在Vote构造函数中,我已经删除了这个类,并且segfault在我的代码的其他stl结构中!那是什么？请帮帮我.

我发现了我的问题的原因,这不是这个代码.问题出在我以前的代码中.谢谢大家参与这次讨论.

Answer 1

从我所看到的,我冒昧地认为真正重要的代码缺失了.

如上所述:this=0x407a59, __x=@0x7fffffff0b50, __y=@0x758948f87d894905很奇怪,地址太过分了,所以我们可以假设其中一个(至少)是未初始化的.为了我自己的理智,我认为你的实施std::map不是错误的.

我的直觉是寻找未初始化的地图,因此,以及未初始化的VoteContainer对象.VoteContainer*在调用registerVote它之前,你会忘记分配一些吗？