Question

我想通过指定3D数组中的特定元素来检索两个变量（例如：var4和var5）。

我目前正在尝试通过为特定元素创建一个对象，然后创建一个类，该类根据该特定元素指定的对象检索name4和name5的值。有什么想法吗？

Answer 1

您的3D容器应该在课堂内private。然后，您的set()函数会将Row Column Depth作为参数以及您想要放在这些坐标中的实际Value或indexes并将其设置在私有容器中。与set()一起，您需要另一个get()函数。同样get()应该使用三个参数indexes，它将从私有容器中为您检索值。

使用此示例构思，您将看到会发生什么。

set(row, column, depth, value); // can be void
RetrievedValue = get(row, column, depth) // should return something

这是使用std::vector的工作代码的基本代码：

#include <iostream>
#include <vector>

using namespace std;

class Whatever
{
private:
    vector<vector<vector<int>>> MyVec; // 3D vector

public:
    Whatever(int RowSize, int ColumnSize, int DepthSize); // default constructor
    int get(int Row, int Column, int Depth);
    void set(int Row, int Column, int Depth, int Value);

};

Whatever::Whatever(int RowSize, int ColumnSize, int DepthSize)
{
    vector<int> TempDepth;
    vector<vector<int>> TempColumn;

    for (int i = 0; i < RowSize; i++)
    {
        for (int j = 0; j < ColumnSize; j++)
        {
            for (int k = 0; k < DepthSize; k++)
            {
                TempDepth.push_back(0); // add an integer zero to depth on every iteration
            } 
            TempColumn.push_back(TempDepth); // add the whole depth to the column
            TempDepth.clear(); // clear
        }
        this->MyVec.push_back(TempColumn); // add the whole column to the row
        TempColumn.clear(); // clear
    }
}


int Whatever::get(int Row, int Column, int Depth) 
{
    return this->MyVec[Row][Column][Depth]; // "get" the value from these indexes
}

void Whatever::set(int Row, int Column, int Depth, int Value)
{
    this->MyVec[Row][Column][Depth] = Value; // "set" the Value in these indexes

}


int main()
{
    int rowSize, columnSize, depthSize;

    cout << "Please enter your desired row size, column size and depth size:\n";
    cin >> rowSize >> columnSize >> depthSize;

    Whatever MyObjectOfClassWhatever(rowSize, columnSize, depthSize); // create a local object and send the sizes for it's default constructor

    // let's say you need "set" a value in [2][4][1]
    MyObjectOfClassWhatever.set(2, 4, 1, 99);

    // now you want to "get" a value in [2][4][1]
    int RetreivedData = MyObjectOfClassWhatever.get(2, 4, 1); // you get it from within the class and assign it to a local variable

    // now you can do whatever you want

    return 0;
}

为3D数组中的特定元素创建对象

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