静态声明的二维数组 C++ 作为类的数据成员 [英] Statically declared 2-D array C++ as data member of a class

问题描述

我正在尝试创建一个 class grid，其中包含数据成员 unsigned NR、unsigned NC 并且它还应该包含一个二维数组双坐标[NR][NC].我希望通过类构造函数初始化数据成员 NR 和 NC.我试图避免二维数组的动态分配，因为我更喜欢连续的内存分配，以便尽可能避免缓存未命中.

I am trying to create a class grid which contains the data members unsigned NR, unsigned NC and it should also contain a 2D array double Coordiantes[NR][NC]. I wish to initialize the data members NR and NC through the class constructor. I am trying to avoid the dynamic allocation of the 2-D array as I prefer contiguous memory allocation so as to avoid the cache misses as much as possible.

我不确定是否可行，但任何输入都会有所帮助.

推荐答案

class Array2D {
public:
    vector<int> v;
    int nc;
    Array2D(int NR, int NC) : v(NR*NC), nc(NC) {}
    int* operator[](int r) { return &v[r*nc]; }
};

int main()
{
    Array2D array2d(2, 3);
    array2d[0][0] = 1;
    array2d[1][2] = 6;
}

这允许您创建一个功能类似于二维数组的类.速度很快，而且数据是连续的.

This allows you to create a class that will function like a 2D array. It's fast and the data is contiguous.

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