小编ter*_*kuh的帖子

我以为我做了一些蠢事 - 至少我认为是这样.我的问题是:为什么这有效？

template<typename T>
class yarray
{
public:
    yarray() {
        pContainer = new T[1]; //initialize as array with size 1
        unCount = 0U; //counter
    }
    ~yarray() {
        delete[] pContainer; //cleanup
        pContainer = nullptr;
    }

    void push_back(T data)
    {
        ((T*)pContainer)[unCount] = data; //set (shouldn't it throw an exception when unCount > 0?
        unCount++; //increment
    }

    T operator[](const unsigned int & index)
    {
        if (index <= unCount)
            return ((T*)pContainer)[index];

        return T();
    }

private:
    void * pContainer;
    unsigned int unCount;
};

int …