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class A {
public:
    explicit A(int x): _magic(0x41), a(x) {}
    ~A() {
        _magic = 0xdead;
    }
    void print() const {
        assert(_magic == 0x41);
        cout << a << endl;
    }
private:
    unsigned _magic;
    int a;
};
int main() {
    auto a = new A(10);
    a->print();
    delete a;
    a->print();
}