我有一个名为 ImageMatrix 的类,它以递归方式实现 C++ 映射;最终结果是我有一个 3 维数组。
typedef uint32_t VUInt32;
typedef int32_t VInt32;
class ImageMatrix
{
public:
ImageMatrixRow operator[](VInt32 rowIndex)
private:
ImageMatrixRowMap rows;
};
typedef std::map <VUInt32, VInt32> ImageMatrixChannelMap;
class ImageMatrixColumn
{
public:
VInt32 &operator[](VUInt32 channelIndex);
private:
ImageMatrixChannelMap channels;
};
typedef std::map<VUInt32, ImageMatrixColumn> ImageMatrixColumnMap;
class ImageMatrixRow
{
public:
ImageMatrixColumn operator[](VUInt32 columnIndex);
private:
ImageMatrixColumnMap columns;
};
typedef std::map<VUInt32, ImageMatrixRow> ImageMatrixRowMap;
每个运算符只返回一个映射包装类,如下所示:
ImageMatrixRow ImageMatrix::operator[](VInt32 rowIndex)
{
return rows[rowIndex];
}
ImageMatrixColumn ImageMatrixRow::operator[](VUInt32 columnIndex)
{
return columns[columnIndex];
}
VInt32 &ImageMatrixColumn::operator[](VUInt32 channelIndex)
{
return channels[channelIndex];
}
基本上,当我将值设置为 100 并将值测试为 cout 时,它显示为 0,而不是我设置的数字。
for (VUInt32 a = 0; a < GetRowCount(); a++)
{
for (VUInt32 b = 0; b < GetColumnCount(); b++)
{
for (VUInt32 c = 0; c < GetChannelCount(); c++)
{
VInt32 value = 100;
matrix[a][b][c] = value;
VInt32 test = matrix[a][b][c];
// pixel = 100, test = 0 - why?
cout << pixel << "/" << test << endl;
}
}
}
注意:我已经对这个例子的原始代码进行了修改,以便它占用更少的空间,因此可能会出现一些语法错误(请不要指出它们)。