Question

我对C ++还是很陌生。 A在GCC中使用std :: map。由于（我认为）很难读取GDB的std :: map输出。我想将地图导出到矢量。

现在我已经弄清楚了（此论坛提供了一些有用的信息）:)如何将地图导出到矢量。现在我正确理解了c ++参考，std :: map不是线程安全的。所以我建立了一个Mutex arround std :: map

template<typename Mutex_Type_T, typename Key_Type_T, typename Mapped_Type_T>
class CConcurrent_Dictionary
{

public:

    CConcurrent_Dictionary();

    class CSingle_Element
    {
    public:

        Key_Type_T key = { };

        Mapped_Type_T mapped_type = { };

    };

    /**
     * Exports all contect of std::map to a vector
     * @param mutex_timeout Mutex timeout
     * @return Vector with all contents of std::map
     */
    std::vector<CSingle_Element> Export(const uint32_t mutex_timeout) const;

private:
    const Mutex_Type_T mutex;

    map<Key_Type_T, Mapped_Type_T> dictionary;
};

Export（）的实现如下所示


template<typename Mutex_Type_T, typename Key_Type_T, typename Mapped_Type_T>
std::vector<CConcurrent_Dictionary<Mutex_Type_T, Key_Type_T, Mapped_Type_T>::CSingle_Element> CConcurrent_Dictionary<Mutex_Type_T, Key_Type_T, Mapped_Type_T>::Export(const uint32_t mutex_timeout) const
{
    std::vector<CSingle_Element> res = {};
    CLock_Guard_New<Mutex_Type_T> lock(mutex);
    if(false == lock.Lock(mutex_timeout))
    {
        return res;
    }


    //export all Elements
    for(const auto& single_element : dictionary)
    {
        CSingle_Element single = {};
        single.key = single_element.first;
        single.mapped_type = single_element.second;
        res.push_back(single);
    }

    return res;
}

但是问题无法编译

note:   expected a type, got 'NDictionary::CConcurrent_Dictionary<Mutex_Type_T, Key_Type_T, Mapped_Type_T>::CSingle_Element'
 error: template argument 2 is invalid
 error: prototype for 'int NDictionary::CConcurrent_Dictionary<Mutex_Type_T, Key_Type_T, Mapped_Type_T>::Export(uint32_t) const' does not match any in class 'NDictionary::CConcurrent_Dictionary<Mutex_Type_T, Key_Type_T, Mapped_Type_T>'

向量模板参数似乎不正确。

据我所知

CConcurrent_Dictionary :: CSingle_Element 成为std :: vector的唯一模板参数。那你能帮我吗？我想念什么？

Answer 1

尝试以下操作：std::vector<typename CConcurrent_Dictionary<Mutex_Type_T, Key_Type_T, Mapped_Type_T>::CSingle_Element>

具有嵌套模板参数的std :: vector

1 个答案: