超类引用子类对象

Question

我试图用我自己的版本覆盖一个类，然后创建一个类的超类引用，但我收到编译错误。这是我的代码结构

文件：RailExtractionInteractorStyle.h（这是我继承超类PCLVisualizerInteractor的子类）

#include<pcl/visualization/interactor_style.h>


class RailExtractionInteractorStyle : public pcl::visualization::PCLVisualizerInteractorStyle
{
public:
    RailExtractionInteractorStyle();
};

文件：RailExtractionInteractor.cpp：

#include "RailExtractionInteractorStyle.h"

RailExtractionInteractorStyle::RailExtractionInteractorStyle()
    : pcl::visualization::PCLVisualizerInteractorStyle()
{
    // just calling super constructor for now
}

文件：CloudPointPicker.hpp（使用RailExtractionInteractorStyle类的任意类）

#include "RailExtractionInteractorStyle.h"

template <typename PointT>
class CloudPointPicker {

protected:


    PointCloudTConstPtr cloud_;
    boost::shared_ptr<pcl::visualization::PCLVisualizer> myview_;


    //attempting to write my own interactor
    RailExtractionInteractorStyle* mystyle_;

public:

    CloudPointPicker() {
        *mystyle_ = new RailExtractionInteractorStyle;

    }

CloudPointPicker构造函数中的语句给出了以下错误：

error: no match for ‘operator=’ in ‘*((CloudPointPicker<pcl::PointXYZ>*)this)->CloudPointPicker<pcl::PointXYZ>::mystyle_ = (operator new(480u), (<statement>, ((RailExtractionInteractorStyle*)<anonymous>)))’

我做错了什么？

Answer 1

您必须删除此行开头的*：

*mystyle_ = new RailExtractionInteractorStyle;

operator new直接应用于指针，不需要取消引用它。