// GCC 4.4
#include <iostream>

using namespace std;

class Arena {
public:
    void* alloc(size_t s) {
        char* p = new char[s];
        cout << "Allocated memory address starts at: " << (void*)p << '\n';
        return p;
    }

    void free(void* p) {
        cout << "The memory to be deallocated starts at: " << p << '\n';
        delete [] static_cast<char*> (p); // the program fails here
    }
};

struct Obj {
    void* operator new[](size_t s,Arena& a) {
        return a.alloc(s);
    }

    virtual ~Obj() {} // if I remove this everything works as expected

    void destroy(size_t n,Arena* a) {
        for (size_t i = 0; i < n; i++)
            this[n - i - 1].~Obj();
        if (a)
            a->free(this);
    }
};


int main(int argc,char** argv) {
    Arena a;

    Obj* p = new(a) Obj[5]();
    p->destroy(5,&a);

    return 0;
}

这是虚拟析构函数存在时我的实现中程序的输出：

Allocated memory address starts at: 0x8895008
The memory to be deallocated starts at: 0x889500c

RUN Failed (exit value 1)

请不要问它应该做什么程序.正如我所说,它来自一个更复杂的案例,其中Arena是各种类型内存的接口.在这个例子中,内存只是从堆中分配和释放.