Effective C++ 條款25

25

namespace WidgetFunc 
{

    template <typename T>
    class Widgett
    {
    public:
        template <typename T>
        Widgett(T* pcObj, size_t size)
        {
            m_pcObj = new T[size];
            memset(m_pcObj, 0, size);
            memcpy_s(m_pcObj, size, pcObj, size);
        };

        ~Widgett()
        {
            delete[] m_pcObj;
        }

        template <typename T>
        void swap(Widgett<T>& other)
        {
            using std::swap;
            swap(m_pcObj, other.m_pcObj);
        };
    private:
        //Widgett() = delete;
        //Widgett& operator=(Widgett&) = delete;
        T* m_pcObj;
    };
    template<typename T>
    void swap(Widgett<T>& a, Widgett<T>& b)
    {
        a.swap(b);
    }


}
int main()
{
    using namespace WidgetFunc;
    char szHello[] = "hello!hello!";
    Widgett<char> a(szHello, sizeof szHello);

    char szWorld[] = "world!world!";
    Widgett<char> b(szWorld, sizeof szWorld);

    using std::swap;
    swap(a, b);
    swap(szHello, szWorld);
    return 0;
}