Class Derived

tests/unit_test/sk_unique_ptr_test.cpp:207–211

    virtual auto GetValue() -> int { return 0; }
  };
  struct Derived : Base {
    int val;
    explicit Derived(int v) : val(v) {}
    auto GetValue() -> int override { return val; }
  };

  kstd::unique_ptr<Base> p(new Derived(42));
  EXPECT_EQ(p->GetValue(), 42);