将模板类转换为标头和 cpp 文件

我试图将以下头文件转换为单独的头文件和.cpp文件。

template <class T>
class Rolodex {
public:
/**
* Creates a new empty Rolodex
*/
Rolodex()
{
sentinel_ = new Item;
sentinel_->value_ = T();
sentinel_->next_  = sentinel_;
sentinel_->prev_  = sentinel_;
current_ = sentinel_;
}
~Rolodex()
{
while (current_ != sentinel_) {
delete_current();
}
delete sentinel_;
}
/**
* Returns true if the Rolodex is positioned at the beginning.
*/
bool is_before_first()
{
return current_ == sentinel_;
}
/**
* Returns true if the Rolodex is positioned at the end.
*/
bool is_after_last()
{
return current_ == sentinel_;
}
/**
* Rotates the Rolodex one step forwards.
*/
void rotate_forward()
{
current_ = current_->next_;
}
/**
* Rotates the Rolodex one step backwards.
*/
void rotate_backward()
{
current_ = current_->prev_;
}
/**
* Returns the value of the current card.
*/
const T &current_value()
{
return current_->value_;
}
/**
* Inserts a new item after the current position and
* positions the Rolodex at the newly inserted item.
*/
void insert_after_current(const T &value)
{
Item *coming = new Item;
coming->value_ = value;
coming->next_  = current_->next_;
coming->prev_  = current_;
current_->next_->prev_ = coming;
current_->next_ = coming;
current_ = coming;
}
/**
* Inserts a new item before the current position and
* positions the Rolodex at the newly inserted item.
*/
void insert_before_current(const T &value)
{
Item *coming = new Item;
coming->value_ = value;
coming->prev_  = current_->prev_;
coming->next_  = current_;
current_->prev_->next_ = coming;
current_->prev_ = coming;
current_ = coming;
}
/**
* Deletes current item and positions the Rolodex
* at the _following_ item
*/
void delete_current()
{
Item *going = current_;
current_->prev_->next_ = current_->next_;
current_->next_->prev_ = current_->prev_;
if (going->next_ == sentinel_)
current_ = going->prev_;
else
current_ = going->next_;
delete going;
}
private:
struct Item {
T value_;
Item *next_;
Item *prev_;
};
Item *sentinel_;
Item *current_;
};
#endif /* ROLODEX_H_ */

但是，当我将它们分开时，如果我不包括

template <class T>

在头文件中，我收到一个错误，试图声明

T value;

但是如果我这样做，我会在.cpp文件中收到多个错误，说 Rolodex 不是文件类或枚举。是否有其他类型可用于声明我的值;如果是这样，我该如何修改代码以适应这一点。任何帮助都非常感谢，我超级迷路

编辑：谢谢大家的帮助，我对C++类缺乏理解，在对您提供的类似线程进行一些研究后，我解决了我的问题。