在类中返回结构时出现问题

Question

I am having a problem when trying to return my struct in C ++ I am still new to that language.

I have the following code

Header File

class Rec : public Rect {
public:
    Rec();

    struct xRect
    {
        int x;
        int y;
    };

    struct SRect
    {
        int position;
        xRect *mtype;
        int value;
        bool enable;
    };

    struct xRect ReturnXRect();

};

Cpp file

struct xRect Rec::ReturnXRect() {

    struct SRect *xrec = xRe::sRect();

    if (xrec)
        return xrec->mtype;

    return nullptr;
}

I am getting error C2556 and C2371. someone what correct way to work struct in the class?

Answer 1

You should add the name of the class to xRect . like this:

//---Header file

class Rec : public Rect {
public:
    Rec();

    struct xRect
    {
        int x;
        int y;
    };

    struct SRect
    {
        int position;
        xRect *mtype;
        int value;
        bool enable;
    };

    xRect ReturnXRect();   //note: you don't to add the struct keyword

};

---

//---Cpp file

Rec::xRect Rec::ReturnXRect() {
//^------------------------------------added Rec:: on return type. `struct`
                                        // keyword is unnecessary.

    SRect *pRec = new SRect();  //i'm assuming this is just an example way 
                                //   to creating your SRect object in your 
                                //   example code. you don't need to allocate 
                                //   actually.

    xRect retVal;

    if (pRec){
        retVal = pRec->mtype;
        delete pRec;             //destroy to avoid memory leak.
    }

    return retVal;
}

since xRect is defined outside of the scope of the class(unless it's inside ReturnXRect() you need to add the Rec:: to inform the compiler what version of xRect you meant to use. since there might be other xRect version of struct defined outside probably from header files.

I also fixed content of ReturnXRect() function so it won't have syntax errors.