解释为何C++多态会崩溃
要点：
1. C++数组不支持多态
2. C++数组元素析构顺序为逆序析构，不管是在堆上还是在栈上；
示例代码：
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#include <iostream>
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using namespace std;
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class Base
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{
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public:
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virtual ~Base()
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{
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cout << "Base::~Base()" << endl;
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}
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};
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class Derived : public Base
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{
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private:
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int flag;
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public:
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~Derived()
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{
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cout << "Derived::~Derived()" << endl;
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}
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};
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class Test
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{
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public:
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~Test()
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{
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cout << "Test::~Test() " << hex << this << endl;
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}
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};
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int main(int argc, char **argv)
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{
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//Base *p = new Derived[10];
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//delete []p;
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cout << "new/delete" << endl;
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Test *pArr = new Test[10];
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delete []pArr;
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cout << "local array" << endl;
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Test test[10];
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return 0;
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解释：
对于最后一个元素，实际上是个Derived对象，而通过Base指针，认为大小为sizeof(Base)，这样去获取虚表调用析构函数就造成了core dump，也就是一个元素都没办法析构成功。
参考：
http://blog.csdn.net/fullsail/article/details/6290568