win7下编程，registerclass死活不成功，错误如图所示，谢谢各位了

template
class TreeNode{
public:
T data;
int index;
int active;
TreeNode & operator=(TreeNode & treenode)
{
this->data=treenode.data;
this->index=treenode.index;
this->active=treenode.active;
return *this;
}
};

温馨提示：答案为网友推荐，仅供参考

当前网址：https://verywind.cn/ee/v73xxf7r7v23vrx2rjx.html