链接器/继承/虚拟函数问题

发布于 2024-10-24 08:10:12 字数 686 浏览 6 评论 0原文

从模板类继承时遇到问题。
看起来像这样：

template<typename type>  
class base {  
protect:  
  ...  
public  
  ...  
  virtual bool func1(type var1);  
};

// 这个类不是模板化的，而是从模板类派生的，不知道它是否有问题

class derived : public base<type_spec_1> {  
protected:  
  ...   
public:  
  ...  
  bool func1(type_spec_1);// function I wish to override;  
};

// 在 .cpp 中，我尝试确定函数的范围，它编译但不链接

bool derived::func1(type_spec_1 type){ return false; };

链接器给了我此格式的错误：LNK2001，无法解析的符号 base::func1(type_spec_1);
就像它没有看到 "driven"==base""
如果可能的话，我怎样才能为此提供正确的语法？？？

原文

Having trouble inheriting from a template class.
Looks something like this:

template<typename type>  
class base {  
protect:  
  ...  
public  
  ...  
  virtual bool func1(type var1);  
};

// this class is not templated but derives from template class, don't know if its issue

class derived : public base<type_spec_1> {  
protected:  
  ...   
public:  
  ...  
  bool func1(type_spec_1);// function I wish to override;  
};

// In the .cpp, I try to scope the function, it compiles but it does not link

bool derived::func1(type_spec_1 type){ return false; };

The linker gives me an error in this format: LNK2001, unresolved symbol base::func1(type_spec_1);
Like it does not see that "derived"==base"<type_type_1>"
How can I provide the proper syntax for this, if it is even possible????

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岁月静好 2024-10-31 08:10:12

你不需要做这样的事情吗？

template<typename type>  
class base {  
protect:  
  ...  
public  
  ...  
  // provide implementation to be overriden
  virtual bool func1(type var1) { return (bool) 0; } 
};

因为 class generated : public base 表示 衍生 是从类型 base 派生的，但是 的类型定义base 尚未完全实现？

Don't you need to do something like this?

template<typename type>  
class base {  
protect:  
  ...  
public  
  ...  
  // provide implementation to be overriden
  virtual bool func1(type var1) { return (bool) 0; } 
};

Because class derived : public base<type_spec_1> says derived is derved from a type base<type_spec_1>, but the type definition of base<type_spec_1> is not completely implemented yet?

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