Question

我偶然发现了继承问题。所以我在3个单独的头文件中有3个类，如下所示：

GenericObject - ＆gt;宾语 GenericObject - ＆gt; LightObject

首先是继承的对象：

#ifndef GENERICMODEL_HPP
#define GENERICMODEL_HPP

#define NO_SDL_GLEXT
#define GLM_FORCE_RADIANS 
#include <GL/glew.h>//before opengl
#include <SDL2/SDL.h>
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <glm/glm.hpp>
#include <vector>
#include <glm/gtc/matrix_transform.hpp>

#include "GenericShader.hpp"
#include "BaseObject.hpp" 
#include "Scene.hpp"

#define FRAGMENT_SHADER 0
#define VERTEX_SHADER 1

class GenericShader;
class Scene;

class GenericModel: public BaseObject{
public:
    GenericModel();
    ~GenericModel();
    virtual void Render();
    bool LoadShaderProgram(char*,char*);
    void BindShaders(GenericShader *);
    void UpdatePosition(glm::vec3);
    void UpdateRotation(float,glm::vec3);
    void UpdateScale(glm::vec3);
    void UpdateMatrix();

    bool shadersLoaded;
    int scenePosNum = 0;
    GLuint programID;//for now
    GLuint vertexBuffer;
    glm::mat4 MVP;
    glm::mat4 modelMatrix;
    //Scene *scene;

protected:

    GenericShader *shaderObj= NULL;
    GLuint vaoID;
    Uint32 verticesCount;
    float angle; 
    glm::vec3 locationVector;
    glm::vec3 rotationVector;
    glm::vec3 scaleVector;
    Scene *scene;
};
#endif

第二

#ifndef MODEL_HPP
#define MODEL_HPP


#include "GenericModel.hpp"
#include <libxml/parser.h>
#include <libxml/tree.h>

class GenericModel;

class Model : public GenericModel{

public:
    Model();
    ~Model();
    void Render();
    bool LoadModelOBJ(char *);
    bool LoadModelXML(char *);
    bool LoadTexture(char *);

private: 
    GLuint textureID;
    GLuint texture;
    bool modelLoaded;
    bool textureLoaded;
    GLuint textureBuffer;
    bool OpenOBJModel(char*, std::vector<glm::vec3> & , std::vector<glm::vec2> & , std::vector<glm::vec3> & );
    bool OpenXMLModel(char *filename, std::vector<glm::vec3> & vertOut, std::vector<glm::vec2> & uvOut, std::vector<glm::vec3> & normalOut);
};
#endif

第三

#ifndef LIGHT_OBJECT_HPP
#define LIGHT_OBJECT_HPP

#include "GenericModel.hpp"

class GenericModel; //PROBLEM

class LightObject: public GenericModel {

public:
    LightObject();
    ~LightObject();
    void Render();
    glm::vec3 GetLight();
    void SetLight(glm::vec3);

private:
    glm::vec3 lightIntenzity;

};
#endif

当我尝试编译它们时，我收到错误

LightObject.hpp：9：27：错误：无效使用不完整类型'class GenericModel' class LightObject：public GenericModel { ^ LightObject.hpp：7：7：错误：'类GenericModel'的前向声明 class GenericModel;

如果我删除了前向声明，则会出现新错误：

LightObject.hpp：9：40：错误：'{'标记之前的预期类名 class LightObject：public GenericModel {

这让我非常困惑，因为它没有Model类的问题，这是以相同的方式完成的。包含前向声明。有人能指出我正确的方向吗？提前致谢！（BTW Base对象只是ID）

Answer 1

其中一个包括LightObject.hpp：

#include "GenericShader.hpp"
#include "BaseObject.hpp" 
#include "Scene.hpp"

C ++前向声明'class GenericModel / missing class name / inheritance

1 个答案: