62 lines · cpp
1struct A {2 explicit A(int u) { _u._u3 = u; }3 A(const A &) = default;4 virtual ~A() = default;5 6private:7 union U {8 char _u1;9 short _u2;10 int _u3;11 };12 13 A::U _u;14};15 16#pragma pack(push, 1)17template <int I> struct B : public virtual A {18 B(char a, unsigned short b, int c) : A(a + b + c), _a(a), _b(b), _c(c) {}19 20private:21 char _a;22 unsigned short : 3;23 unsigned short _b : 6;24 unsigned short : 4;25 int _c;26};27#pragma pack(pop)28 29#pragma pack(push, 16)30class C : private virtual B<0>, public virtual B<1>, private B<2>, public B<3> {31public:32 C(char x, char y, char z)33 : A(x - y + z), B<0>(x, y, z), B<1>(x * 2, y * 2, z * 2),34 B<2>(x * 3, y * 3, z * 3), B<3>(x * 4, y * 4, z * 4), _x(x * 5),35 _y(y * 5), _z(z * 5) {}36 37 static int abc;38 39private:40 int _x;41 short _y;42 char _z;43};44int C::abc = 123;45#pragma pack(pop)46 47class List {48public:49 List() = default;50 List(List *p, List *n, C v) : Prev(p), Next(n), Value(v) {}51 52private:53 List *Prev = nullptr;54 List *Next = nullptr;55 C Value{1, 2, 3};56};57 58int main() {59 List ls[16];60 return 0;61}62