C++问题:声明冲突

Question

我在使用OpenGL的C++项目上遇到问题：在我的文件"cube.cpp"中，我有以下内容：

    point3 r1 = point3(40.0,0.0,-450.0);
    point3 r2 = point3(55.0,0.0,-450.0);
    point3 r3 = point3(55.0,0.5,-450.0);
    point3 r4 = point3(40.0,0.5,-450.0);
    point3 r[4];
    r[0] = r1;
    r[1] = r2;
    r[2] = r3;
    r[3] = r4;      
    rails(r);

Point3是一个表示顶点的对象。Rails是一个绘制三维轨道的对象。问题是当我想编译我的项目时，我有这样的：

g++ Struct.cpp skybox.cpp rails.cpp cube.cpp -o train
cube.cpp: 
In function ‘void display()’:
cube.cpp:296:11: error: conflicting declaration ‘rails r’
    rails(r);
           ^
cube.cpp:291:11: error: ‘r’ has a previous declaration as ‘point3 r [4]’
    point3 r[4];
           ^

我问了我的朋友，但我们不知道为什么它不想编译rails（r），之前我创建了一个类Skybox，这个类的参数类型相同，可以正常工作。

如果有人有想法。。。

编辑：rails.h

#ifndef RAILS_H_
#define RAILS_H_
#include "Struct.h"
using namespace std;
class rails{
public:
    rails(point3[]);
};
#endif /* RAILS_H_ */

和rails.cpp

#include "rails.h"
#ifdef __APPLE__
//compilation sous MacOs par :
//gcc -framework GLUT -framework OpenGL -framework Cocoa source.c -o nom_executable
    #include <OpenGL/gl.h>
    #include <OpenGL/glu.h>
    #include <GLUT/glut.h>
#endif
#ifdef __WIN32__
//parce qu'il manque des choses aux gens qui utilisent MsWindows, où OpenGL ne peut fonctionner que s'il discute avec le gestionnaire de fenêtres ("windows.h")
    #define GLUT_DISABLE_ATEXIT_HACK    //utile si vous compilez en g++ sous windows avec le glut.lib prévu pour MsVisual
    #include <windows.h>
    #include "glut.h"   //il faut avoir le fichier "glut.h" dans le même répertoire que votre .cpp (et aussi le glut.lib et le glut.dll)
#endif
#ifdef __linux__
    //pour les non-windowiens, GLUT (fenêtrage opengl) est inclu dans les distributions
    //pour les ubuntiens : apt-get install freeglut3 freeglut3-dev
    #include <GL/glut.h>
    #include <GL/glu.h>
#endif
rails::rails(point3 rd[]){
    float dis = 0.0;
    while(dis < 900){
            glBegin(GL_QUADS);
                glColor3ub(90,0,0);
                glVertex3d(rd[0].x,rd[0].y,rd[0].z+dis);
                glVertex3d(rd[1].x,rd[1].y,rd[1].z+dis);
                glVertex3d(rd[2].x,rd[2].y,rd[2].z+dis);
                glVertex3d(rd[3].x,rd[3].y,rd[3].z+dis);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,0,0);
                glVertex3d(rd[0].x,rd[0].y,rd[0].z+2.0+dis);
                glVertex3d(rd[1].x,rd[1].y,rd[1].z+2.0+dis);
                glVertex3d(rd[2].x,rd[2].y,rd[2].z+2.0+dis);
                glVertex3d(rd[3].x,rd[3].y,rd[3].z+2.0+dis);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,0,0);
                glVertex3d(rd[3].x,rd[3].y,rd[3].z+dis);
                glVertex3d(rd[2].x,rd[2].y,rd[2].z+dis);
                glVertex3d(rd[2].x,rd[2].y,rd[2].z+2.0+dis);
                glVertex3d(rd[3].x,rd[3].y,rd[3].z+2.0+dis);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,0,0);
                glVertex3d(rd[0].x,rd[0].y,rd[0].z+dis);
                glVertex3d(rd[3].x,rd[3].y,rd[3].z+dis);
                glVertex3d(rd[3].x,rd[3].y,rd[3].z+2.0+dis);
                glVertex3d(rd[0].x,rd[0].y,rd[0].z+2.0+dis);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,0,0);
                glVertex3d(rd[1].x,rd[1].y,rd[1].z+dis);
                glVertex3d(rd[2].x,rd[2].y,rd[2].z+dis);
                glVertex3d(rd[2].x,rd[2].y,rd[2].z+2.0+dis);
                glVertex3d(rd[1].x,rd[1].y,rd[1].z+2.0+dis);
            glEnd();
            dis=dis+5.0;
        }
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(54.0,0.0,-450.0);
                glVertex3d(53.5,0.0,-450.0);
                glVertex3d(53.5,1.0,-450.0);
                glVertex3d(54.0,1.0,-450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(54.0,0.0,450.0);
                glVertex3d(53.5,0.0,450.0);
                glVertex3d(53.5,1.0,450.0);
                glVertex3d(54.0,1.0,450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(54.0,1.0,-450.0);
                glVertex3d(53.5,1.0,-450.0);
                glVertex3d(53.5,1.0,450.0);
                glVertex3d(54.0,1.0,450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(54.0,0.0,-450.0);
                glVertex3d(54.0,1.0,-450.0);
                glVertex3d(54.0,1.0,450.0);
                glVertex3d(54.0,0.0,450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(53.5,0.0,-450.0);
                glVertex3d(53.5,1.0,-450.0);
                glVertex3d(53.5,1.0,450.0);
                glVertex3d(53.5,0.0,450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(41.0,0.0,-450.0);
                glVertex3d(41.5,0.0,-450.0);
                glVertex3d(41.5,1.0,-450.0);
                glVertex3d(41.0,1.0,-450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(41.0,0.0,450.0);
                glVertex3d(41.5,0.0,450.0);
                glVertex3d(41.5,1.0,450.0);
                glVertex3d(41.0,1.0,450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(41.0,1.0,-450.0);
                glVertex3d(41.5,1.0,-450.0);
                glVertex3d(41.5,1.0,450.0);
                glVertex3d(41.0,1.0,450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(41.0,0.0,-450.0);
                glVertex3d(41.0,1.0,-450.0);
                glVertex3d(41.0,1.0,450.0);
                glVertex3d(41.0,0.0,450.0);
            glEnd();
            glBegin(GL_QUADS);
                glColor3ub(90,90,90);
                glVertex3d(41.5,0.0,-450.0);
                glVertex3d(41.5,1.0,-450.0);
                glVertex3d(41.5,1.0,450.0);
                glVertex3d(41.5,0.0,450.0);
            glEnd();
}

Answer 1

当前，您正在尝试创建名为r的rails对象。

添加rails对象的名称以调用构造函数。类似rails my(r);