問題描述

我在頭文件中定義一個結構，然后在相應的 .cpp 文件中設置其成員.為此，我使用了一個函數，該函數應該在其范圍內創建一個(相同的)結構，然后返回它.像這樣:

I am defining a structure in a header file, and then setting its members in the corrosponding .cpp file. For doing this I am using a function that is supposed to create a (same) structure in its scope, and then return it. Something like this:

在標題中:

#include <things>
class GLWindow : public QGLWidget, public QGLFunctions
{
    Q_OBJECT
public:
    GLWindow(QWidget *parent = 0);
    ~GLWindow();

    //....
    struct Drawable
    {
        GLuint     vertexBuffer;
        GLuint     indexBuffer;
        int        faceCount;
        QMatrix4x4 transform;
    }cube;
    GLuint cubeTex;

    Drawable CreateDrawable(GLfloat* C_vertices, GLfloat* C_tex, GLfloat* C_normals, GLushort* C_facedata, int faces);
    //.....
};

在 cpp 文件中:

#include "glwindow.h"

Drawable GLWindow :: CreateDrawable(GLfloat *C_vertices, GLfloat *C_tex, GLfloat *C_normals, GLushort *C_facedata, int faces)
{
    int faceCount =faces;

    QMatrix4x4 Transform;
    Transform.setToIdentity();

    GLuint VB;
    /*Create vertexbuffer...*/

    GLuint IB;
    /*Create indexbuffer...*/

    Drawable drawable;
    drawable.faceCount = fCount;
    drawable.transform = Transform;
    drawable.vertexBuffer = VB;
    drawable.indexBuffer = IB;

    return drawable;
}

void GLWindow :: someOtherFunction()
{
    //.....
    cube = CreateDrawable(cube_vertices, cube_tex, cube_normals, cube_facedata, cube_face);
    //.....
}

我收到一個錯誤，指出 'Drawable' 沒有命名類型，但我不明白為什么我會收到這個錯誤，或者我可以做些什么來消除它.>

I am getting an error stating that 'Drawable' does not name a type, but I can't comprehend why I am getting this error, or what I can do to eliminate it.

推薦答案

你需要在cpp文件中限定Drawable:

You need to qualify Drawable in the cpp file:

GLWindow::Drawable GLWindow :: CreateDrawable(GLfloat *C_vertices, GLfloat *C_tex, GLfloat *C_normals, GLushort *C_facedata, int faces)

在 cpp 文件中，在成員方法之外，您在類上下文之外進行操作.在方法內部你可以使用Drawable，但在外部(包括返回類型)，你需要使用GLWindow::Drawable.

In the cpp file, outside the member methods, you're operating outside the class context. Inside the methods you can use Drawable, but outside (including return type), you need to use GLWindow::Drawable.

如果你實際上從方法中返回了一個 Drawable，而不是一個 void - 也是一個錯誤.

That's if you're actually returning a Drawable from the method, not a void - also an error.

這篇關于c ++ struct 未命名類型的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！