c++ - 如何在C++中访问作用域的变量输出？

Question

例如，

class GetDepth_Class {
    public:
        vector<int> positionX, positionY;
        vector<int>::iterator it;
        int getDepth();
    };

int GetDepth_Class::getDepth(){
                ......
                ......
                if (scalar[0] == 0 && scalar[1] == 0 && scalar[2] == 0) {

                    it = positionX.begin();
                    positionX.insert(it, i + 80);

                    it = positionY.begin();
                    positionY.insert(it, j + 80);
                }

                for (int i = 0; i < positionX.size(); i++) {
                    cout << positionX[i] << "," << positionY[i] << endl;
                }


return EXIT_SUCCESS;//realsense depth camera module
}

    int main() {

    GetDepth_Class Obj;
    Obj.getDepth();

    //Here I would like to access the values of vector positionX and vector positionY output from GetDepth_Class::getDepth(), 
    //how should I do if I want to avoid using global variable?

}

我想访问main()中从getDepth()输出的vector positionX和vector positionY的值，并且我想避免使用全局变量。有什么解决方案吗？

谢谢

Answer 1

您也可以使用struct返回多个值:

#include <iostream>
#include <vector>

using namespace std;

// using a struct for returning multiple variables
struct Decl
{
    vector<int> posX;
    vector<int> posY;
};

class GetDepth_Class
{
    // these are private members now
    vector<int> positionX, positionY;
    vector<int>::iterator it;

public:
    Decl getDepth();
};

Decl GetDepth_Class::getDepth()
{
    Decl d;

    it = positionX.begin();
    positionX.insert(it, 80);

    it = positionY.begin();
    positionY.insert(it, 74);

    d = {positionX, positionY};

    for (int i = 0; i < positionX.size(); i++)
        cout << positionX[i] << "," << positionY[i] << endl;

    return d;
}

int main()
{

    GetDepth_Class Obj;
    Decl x = Obj.getDepth();

    for (int i = 0; i < x.posX.size(); i++)
        cout << x.posX[i] << ' ';
    cout << endl;

    for (int i = 0; i < x.posY.size(); i++)
        cout << x.posY[i] << endl;

    return 0;
}

我知道这有点困惑，但可以理解。

我已经设置了 {positionX, positionY}并返回了它，并使用循环以 main()读取了它。

Sample Output:

80,74 // printed from class function
80    // positionX from main()
74    // positionY from main()