智能指针的简单分析(三)——unique_ptr

最新推荐文章于 2025-07-11 23:19:49 发布

明月漫千山

最新推荐文章于 2025-07-11 23:19:49 发布

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分类专栏： C++11 智能指针

本文链接：https://blog.youkuaiyun.com/chicaidecaiji/article/details/81096881

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智能指针

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本文介绍了一个自定义的智能指针类MyUniquePtr的实现细节，该类使用模板设计并支持删除器，提供了资源独占管理的功能，包括移动构造与赋值等特性。

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忽略了释放函数的，但是不妨碍理解主要实现

template<typename Ty, typename Dy = nullptr_t>
class MyUniquePtr
{
    typedef typename Ty* MyPointer;
    typedef typename Dy MyDeleter;
    typedef MyUniquePtr<Ty, Dy> MyObj;
private:
    MyPointer m_ptPointer;
    MyDeleter m_deleter;
public:
    MyUniquePtr() : m_ptPointer(nullptr) {};
    MyUniquePtr(MyPointer p) :m_ptPointer(p) {};
    MyUniquePtr(const MyObj& other) = delete;
    MyUniquePtr& operator= (const MyObj& other) = delete;
    MyUniquePtr(MyUniquePtr&& other)
    {
        this->m_ptPointer = other.m_ptPointer;
        this->m_deleter = other.m_deleter;
         
        other.m_ptPointer = nullptr;
        other.m_deleter = nullptr;
    };
    MyUniquePtr& operator=(MyObj&& other)
    {
        this->m_ptPointer = other.m_ptPointer;
        this->m_deleter = other.m_deleter;
        other.m_ptPointer = nullptr;
        other.m_deleter = nullptr;
        return *this;
    }
    ~MyUniquePtr() { free();}
    MyPointer get() { return m_ptPointer; }
    MyDeleter get_deleter() { return m_deleter; };
    MyPointer release() 
    { 
        auto pTemp = m_ptPointer;
        m_ptPointer = nullptr;
        return pTemp;
    }
    void reset(MyPointer p = nullptr)
    {
        free();
        m_ptPointer = p;
    }
    void swap(MyObj& other)
    {
        auto ptPointer_Temp = other.get();
        auto deleter_Temp = other.get_deleter();
        other.m_ptPointer = get();
        other.m_deleter = get_deleter();
        m_ptPointer = ptPointer_Temp;
        m_deleter = deleter_Temp;
    }
    MyPointer operator->() { return m_ptPointer; }
    operator bool() { return m_ptPointer != nullptr; }
private:
    void free()
    {
        if (m_ptPointer != nullptr)
        {
            delete m_ptPointer;
            m_ptPointer = nullptr;
        }
    }
};