哪个c ++容器可以包含C int多维数组(C++ 03/MSVC11)？

Question

我有这个多维2阵列

int anArray1[MAX_ROW][MAX_CELL] =
{
    { 0, 1, 1, 0, 1, 1, 1, 0},
    { 0, 1, 1, 0, 1, 1, 1, 0},
    { 0, 1, 1, 0, 1, 1, 1, 0},
    { 0, 1, 1, 0, 1, 1, 1, 0},
    { 0, 0, 0, 0, 0, 0, 0, 0}
}


int anArray2[MAX_ROW][MAX_CELL] =
{
    { 0, 1, 1, 0, 1, 1, 1, 0},
    { 0, 1, 1, 0, 1, 1, 1, 0},
    { 0, 1, 1, 0, 1, 1, 1, 0},
    { 0, 1, 1, 0, 1, 1, 1, 0},
    { 0, 0, 0, 0, 0, 0, 0, 0}
}

我想将它们存储在基于索引的容器中,我试图创建另一个应该像这样保存它们的int数组:

int LevelsArray[LEVELS_COUNT] = { anArray1, anArray2};

我得到这个错误:

error C2440: 'initializing' : cannot convert from 'int [68][8]' to 'int'

我想这不是正确的方法..推荐的方式是什么？

Answer 1

我不认为一个普通的旧数组是一个C++容器.因为原因,我宁愿使用std::vector(或std::array)的组合.

这是一个例子:

#include <iostream>
#include <vector>

typedef int cell;
typedef std::vector<cell> row;
typedef std::vector<row> level;
typedef std::vector<level> levels;

int main() {
    levels l = 
    {
        {
            { 0, 1, 1, 0, 1, 1, 1, 0},
            { 0, 1, 1, 0, 1, 1, 1, 0},
            { 0, 1, 1, 0, 1, 1, 1, 0},
            { 0, 1, 1, 0, 1, 1, 1, 0},
            { 0, 0, 0, 0, 0, 0, 0, 0}
        },
        {
            { 0, 1, 1, 0, 1, 1, 1, 0},
            { 0, 1, 1, 0, 1, 1, 1, 0},
            { 0, 1, 1, 0, 1, 1, 1, 0},
            { 0, 1, 1, 0, 1, 1, 1, 0},
            { 0, 0, 0, 0, 0, 0, 0, 0}
        },
    };
    for (int i = 0; i < l.size(); i++) {
        std::cout << "level " << i << ":\n" ;
        for (row & r : l[i]) {
            for (cell & c : r)
                std::cout << c << " ";
            std::cout << "\n";
        }
        std::cout << "\n";
    }
}

输出是:

$ g++ test.cc -std=c++11 && ./a.out
level 0:
0 1 1 0 1 1 1 0 
0 1 1 0 1 1 1 0 
0 1 1 0 1 1 1 0 
0 1 1 0 1 1 1 0 
0 0 0 0 0 0 0 0 

level 1:
0 1 1 0 1 1 1 0 
0 1 1 0 1 1 1 0 
0 1 1 0 1 1 1 0 
0 1 1 0 1 1 1 0 
0 0 0 0 0 0 0 0 

使用std::array相反可能看起来像这样:

#include <iostream>
#include <vector>
#include <array>

const int cells_per_row = 8;
const int rows_per_level = 5;
const int nlevels = 2;
typedef int cell;
typedef std::array<cell, cells_per_row> row;
typedef std::array<row, rows_per_level> level;
typedef std::array<level, nlevels> levels;

int main() {
    levels l = 
    {
        level{
            row{ 0, 1, 1, 0, 1, 1, 1, 0},
            row{ 0, 1, 1, 0, 1, 1, 1, 0},
            row{ 0, 1, 1, 0, 1, 1, 1, 0},
            row{ 0, 1, 1, 0, 1, 1, 1, 0},
            row{ 0, 0, 0, 0, 0, 0, 0, 0}
        },
        level{
            row{ 0, 1, 1, 0, 1, 1, 1, 0},
            row{ 0, 1, 1, 0, 1, 1, 1, 0},
            row{ 0, 1, 1, 0, 1, 1, 1, 0},
            row{ 0, 1, 1, 0, 1, 1, 1, 0},
            row{ 0, 0, 0, 0, 0, 0, 0, 0}
        },
    };
    for (int i = 0; i < l.size(); i++) {
        std::cout << "level " << i << ":\n" ;
        for (row & r : l[i]) {
            for (cell & c : r)
                std::cout << c << " ";
            std::cout << "\n";
        }
        std::cout << "\n";
    }
}

请注意,这些示例使用了每个编译器可能不支持的C++ 11功能(初始化列表,基于范围的,std :: array).虽然您可以使用初始化列表初始化容器和基于范围的for循环进行打印,但在C++ 11之前没有std :: array.

以供参考:

• http://en.cppreference.com/w/cpp/container/vector
• http://en.cppreference.com/w/cpp/container/array
• std :: vector和std :: array初始化列表之间的区别
• 使用硬编码元素初始化std :: vector的最简单方法是什么？
• http://en.cppreference.com/w/cpp/language/range-for