在C ++中重新分配多维数组
[英]Reassigning a multidimensional array in C++
问题描述
我正在创建一个将采用char参数并将其转换为bool [8] [8]数组的函数。 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，当我在程序中运行此代码时，它返回：
error: assigning to an array from an initializer list
2 个解决方案
解决方案1
2 已采纳 2016-02-13 02:22:05
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。
解决方案2
0 2016-02-13 02:16:29
您无法在运行时使用初始化程序列表将值显式分配给数组。
尝试这个：
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);
如果您最终只是将其写入视频帧缓冲区，请考虑使用char而不是bool。 尽管您的代码看起来并不漂亮，但这将使事情简化很多；）
C ++中的多维数组？
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