虚函数和模板冲突 [英] Virtual functions and template clash

问题描述

我有一个pointAcculator的抽象基类。这个抽象基础将使用诸如返回所有点的平均值的函数的方法来填充。这两个类的示例如下所示：

  class lala {
 public：
 virtual someFunctions = 0; 
 
 virtual bool isEmpty（）= 0; 
}; 
 
 
 class lalaLower：public lala {
 public：
 lalaLower（）{} 
〜lalaLower（）{} 
 
 
 someFunctions 
 
 template< class Archive> void serialize（Archive& ar，const unsigned int version）{
 ar&高度
} 
 
 protected：
 std :: deque< double>高度
}; 
  

正如你可以看到的代码中，我也想使用boost序列化来保存这些类型。现在使用工厂模式我相信你调用pointAccumulator类型像这样：

  lala * a1 = new lalaLower 
  

我的问题是模板序列化方法将无法访问，如果我这样调用。我也不能在抽象类中有模板类，因为这是c ++不允许的。是否有办法解决这个问题？

编辑：

序列化，但这需要高度是公共的，这是不理想的，也不是好的编程风格。我认为一个使用友类或函数的方法可能渗透到访问变量的类中，同时仍然保持基类的抽象？

我认为使用友元类或函数是一个很好的解决方案，你可以添加新的类像Serializor

这里是一个友好函数的例子

  class Serializor; 
 class meanAccumulator：public pointAccumulator 
 {
 public：
 meanAccumulator（）{} 
〜meanAccumulator（）{} 
 double getHeight 
 void addHeight（double Height）; 
 void setHeight（double height）; 
 bool isEmpty（）{return heights_.empty（）; } 
 
 protected：std :: deque< double>高度
 friend int Serializor :: Func1（Serializor&）; 
 
}; 
  

请参阅 http://msdn.microsoft.com/en-us/library/ahhw8bzz.aspx

I have an abstract base class for a pointAccumulator. This abstract base will be filled out with methods such as a function that returns mean of all the points. An example of these two classes is shown below:

class lala {
public:
    virtual someFunctions = 0;

    virtual bool isEmpty() = 0;
};


class lalaLower : public lala {
public:
    lalaLower(){}
    ~lalaLower(){}


    someFunctions

    template<class Archive> void serialize(Archive & ar, const unsigned int version) {
        ar & heights_;
    }

protected:
    std::deque<double> heights_;
};

As you can see in the code I would also like to use boost serialization in to save these types. Now using a factory pattern i believe that you call the pointAccumulator types like this:

lala *a1 = new lalaLower();

My problem is that the templated serialize method will not be accessible if I call it this way. Also I cannot have the templated class in the abstract class as this is not allowed by c++. Is there a way to get around this?

Edit:

I have considered the non-intrusive method for serialization but that requires heights_ to be public which is not ideal, nor is it good programming style. I thought potentially a method using friend classes or functions could penetrate the class with access to the variables while still keeping the base class abstract? can anyone explain how this would work?

解决方案

I think using friend classes or functions is a good solution, you could add new class like Serializor

here is a example of friend function

class Serializor;
class meanAccumulator : public pointAccumulator 
{ 
public:     
meanAccumulator(){}     
~meanAccumulator(){}     
double getHeight();     
void addHeight(double Height);     
void setHeight(double Height);     
bool isEmpty(){ return heights_.empty(); }      

protected:     std::deque<double> heights_; 
friend int Serializor::Func1( Serializor& );

};

refer to http://msdn.microsoft.com/en-us/library/ahhw8bzz.aspx

这篇关于虚函数和模板冲突的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！