c++ - 向量将派生的智能指针推回基本抽象类的智能指针向量中

Question

假设我有以下基本抽象类

class Worker {
    public:
      struct Details {
           std::string name;
      };
    public:
      virtual void work() = 0;

};
class Manager {
    public: 
      virtual ~Manager() = default;
      virtual void hire(Worker::Details details) = 0;
      virtual void fire(const Worker & worker) = 0;
};

然后我实现了这两个抽象类：

class DerivedWorker : Worker {
    public:
      DerivedWorker(Worker::Details details) : details(details) {}
      
      void work() override {}
    private:
      Worker::Details details;
};
class Derived : Manager {
    public:
      Derived() {}
      void hire(Worker::Details details) override {
          workers.push_back(std::make_unique<DerivedWorker>(details));
      }
      void fire(const Worker & worker) override {}
    private:
      std::vector<std::unique_ptr<Worker>> workers;
};

为什么会workers.push_back(std::make_unique<DerivedWorker>(details)抛出编译器error: no matching member function for call to 'push_back'异常？

同样，你会如何做同样的事情workers.emplace_back(...)？

标签： c++inheritancevectorunique-ptrpush-back

Answer 1

push_back不起作用，因为您忘记公开继承。

emplace_back 可能是同样的问题，尽管您永远不应该将 emplace_back 用于智能指针向量。