?? covariant1.c
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// PR c++/5607// { dg-do run }class A {public: virtual A* getThis() { return this; }};class B {int a;public: virtual B* getThis() { return this; }};class AB : public A, public B {public: virtual AB* getThis() { return this; }};int main (){ AB* ab = new AB(); A* a = ab; B* b = ab; if (a->getThis() != a || b->getThis() != b) return 1; return 0;}?? 快捷鍵說(shuō)明
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