在 C++ 中重新分配多维数组

Question

我正在创建一个函数，它将接受一个 char 参数并将其转换为 bool[8][8] 数组。这是我的函数现在的样子：

void DotMatrix::displayCharacter(char c, bool doScrolling, int milliseconds){
bool pixelMap[8][8];
if (c == 'A'){
    pixelMap = {
        {0,0,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,1,1,1,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0}
    };
} else if (c == 'B'){
    pixelMap = {
        {0,1,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,1,1,1,0,0,0}
    };
} else if (c == 'C'){
    pixelMap = {
        {0,0,0,1,1,0,0,0},
        {0,0,1,0,0,1,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,0,1,0,0,1,0,0},
        {0,0,0,1,1,0,0,0}
    };
} else if (c == 'D'){
    pixelMap = {
        {0,1,1,1,0,0,0,0},
        {0,1,0,0,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,1,0,0,0},
        {0,1,1,1,0,0,0,0}
    };
} else if (c == 'E'){
    pixelMap = {
        {0,1,1,1,1,1,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,1,1,1,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,1,1,1,1,0,0}
    };
} else if (c == 'F'){
    pixelMap = {
        {0,1,1,1,1,1,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,1,1,1,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0}
    };
} else if (c == 'G'){
    pixelMap = {
        {0,0,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,1,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,0,1,1,1,0,0,0}
    };
} else if (c == 'H'){
    pixelMap = {
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,1,1,1,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0}
    };
} else if (c == 'I'){
    pixelMap = {
        {0,1,1,1,1,1,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,1,1,1,1,1,0,0}
    };
} else if (c == 'J'){
    pixelMap = {
        {0,0,0,0,1,1,0,0},
        {0,0,0,0,0,1,0,0},
        {0,0,0,0,0,1,0,0},
        {0,0,0,0,0,1,0,0},
        {0,0,0,0,0,1,0,0},
        {0,0,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,0,1,1,1,0,0,0}
    };
} else if (c == 'K'){
    pixelMap = {
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,1,0,0,0},
        {0,1,0,1,0,0,0,0},
        {0,1,1,0,0,0,0,0},
        {0,1,0,1,0,0,0,0},
        {0,1,0,0,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0}
    };
} else if (c == 'L'){
    pixelMap = {
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,1,1,1,1,0,0}
    };
} else if (c == 'M'){
    pixelMap = {
        {0,1,1,0,1,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0}
    };
} else if (c == 'N'){
    pixelMap = {
        {0,1,0,0,0,1,0,0},
        {0,1,1,0,0,1,0,0},
        {0,1,1,0,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,0,1,1,0,0},
        {0,1,0,0,1,1,0,0},
        {0,1,0,0,0,1,0,0}
    };
} else if (c == 'O'){
    pixelMap = {
        {0,0,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,0,1,1,1,0,0,0}
    };
} else if (c == 'P'){
    pixelMap = {
        {0,1,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,1,1,1,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,0,0,0,0,0,0}
    };
} else if (c == 'Q'){
    pixelMap = {
        {0,0,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,0,1,1,0,0},
        {0,0,1,1,1,0,1,0}
    };
} else if (c == 'R'){
    pixelMap = {
        {0,1,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,1,1,1,0,0,0},
        {0,1,0,1,0,0,0,0},
        {0,1,0,0,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0}
    };
} else if (c == 'S'){
    pixelMap = {
        {0,0,1,1,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,0,0,0},
        {0,0,1,1,1,0,0,0},
        {0,0,0,0,0,1,0,0},
        {0,0,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,0,1,1,1,0,0,0}
    };
} else if (c == 'T'){
    pixelMap = {
        {0,1,1,1,1,1,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0}
    };
} else if (c == 'U'){
    pixelMap = {
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,0,1,1,1,1,0,0}
    };
} else if (c == 'V'){
    pixelMap = {
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,0,1,0,1,0,0,0},
        {0,0,1,0,1,0,0,0},
        {0,0,1,0,1,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0}
    };
} else if (c == 'W'){
    pixelMap = {
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,0,1,0,1,0,0},
        {0,1,1,0,1,1,0,0}
    };
} else if (c == 'X'){
    pixelMap = {
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,0,1,0,1,0,0,0},
        {0,0,1,0,1,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,1,0,1,0,0,0},
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0}
    };
} else if (c == 'Y'){
    pixelMap = {
        {0,1,0,0,0,1,0,0},
        {0,1,0,0,0,1,0,0},
        {0,0,1,0,1,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0}
    };
} else if (c == 'Z'){
    pixelMap = {
        {0,1,1,1,1,1,0,0},
        {0,0,0,0,0,1,0,0},
        {0,0,0,0,1,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,0,1,0,0,0,0},
        {0,0,1,0,0,0,0,0},
        {0,1,0,0,0,0,0,0},
        {0,1,1,1,1,1,0,0}
    };
} else if (c == ' '){
    pixelMap = {
        {0,0,0,0,0,0,0,0},
        {0,0,0,0,0,0,0,0},
        {0,0,0,0,0,0,0,0},
        {0,0,0,0,0,0,0,0},
        {0,0,0,0,0,0,0,0},
        {0,0,0,0,0,0,0,0},
        {0,0,0,0,0,0,0,0},
        {0,0,0,0,0,0,0,0}
    };
}
if (doScrolling == 1){
    scrollPixels(milliseconds, pixelMap);
} else {
    displayPixels(milliseconds, pixelMap);
}

} 但是，当我在我的程序中运行这段代码时，它 returns:

error: assigning to an array from an initializer list

Answer 1

您不能在运行时使用初始化列表显式地为数组赋值。

试试这个：

 auto tempMap = std::initializer_list<bool>({
    {0,0,1,1,1,0,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,1,1,1,1,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,0,0,0,1,0,0});
 std::copy(tempMap.begin(), tempMap.end(), pixelMap);

如果您最终只想将其写入视频帧缓冲区，请考虑使用 char 而不是 bool。这会大大简化事情，尽管您的代码看起来不那么漂亮 ;)

Answer 2

考虑一个更好的方法：

 bool pixelmap[26][8][8] = {
  {
    {0,0,1,1,1,0,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,1,1,1,1,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,0,0,0,1,0,0},
    {0,1,0,0,0,1,0,0}
  },

  // No, no need to repeat everything.
};

if (c >= 'A' && c <= 'Z')
{
   auto p=pixelmap[c-'A'];

   // ...
}

无需复制或分配任何内容。

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