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我陷入了 C++ 的概念问题:

我创建了一个 Pool 模板类,它的功能与 std::list 几乎相同,但只存储对象,并称自己为构造函数,带有放置 new 和存储对象的析构函数。

然后我创建了一个具有 getObjectWithClass 模板方法的 ObjectAllocator 类。我想让这个类像一个接口,这样我就可以有一个 PoolObjectAllocator 子类,它充当 ObjectAllocator 和 Pool 模板类之间的桥梁。

但是没有办法将 getObjectWithClass 创建为虚拟的,因为这是一个模板方法。

template <class T>
class Pool {
  ...
public:
  T& getFreeObject();
  ...
}

class ObjectAllocator {
public:
  template <class T> T* getObjectWithClass(); // I need this method to be virtual
};

class PoolObjectAllocator : public ObjectAllocator {
  std::map<int, void *> pools;

public:
  template <class T> T* getObjectWithClass() {
    int type = T::GetType();

    Pool<T> *pool;
    if (this->pools.find(type) == this->pools.end()) {
      pool = new Pool<T>();
      pools[type] = pool;
    } else {
      pool = static_cast<Pool<T> *>(pools[type]);
    }

    return &pool->getFreeObject();
  };
};

// Later in the program :
ObjectAllocator *objectAllocator = myObject.getObjectAllocator();
objectAllocator->getObjectWithClass<OneClass>();

// Because the above line call a non virtual method, the method called is ObjectAllocator::getObjectAllocator and not PoolObjectAllocator::getObjectAllocator even if the objectAllocator is a PoolObjectAllocator.

我找不到让这个工作的方法,有人可以帮助我吗?谢谢

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