Im currently working on Opencv 3.0 C++ in Xcode 7.2. I have and code error written
Variable length array of non-POD element type cv::Mat
The sample code was define as below
Mat symbol[opts.numofblocksX*opts.numofblocksY];
I have change the code to
Mat symbol = symbol[opts.numofblocksX * opts.numofblocksY];
and it show another error
cv::Mat doest not provide a subscript operator
Is there anyone facing the same problem before? what was the solutions I can implement here?
Thanks
This code:
cv::Mat symbol[opts.numofblocksX*opts.numofblocksY];
Defines an array of Mats of size opts.numofblocksX*opts.numofblocksY.
The error you got is because the size of this array is not fixed at compile time and this is not a POD type.
Your new code is flawed.
cv::Mat symbol = symbol[opts.numofblocksX * opts.numofblocksY];
This defines a single Mat called symbol, and then nonsensically tries to call operator[] on it with opts.numofblocksX * opts.numofblocksY as an argument. This is not declaring an array.
Two obvious options present themselves:
Allocate your array on the heap, where variable-size allocation is allowed. Don't forget to delete[] it later! (or use a smart pointer)
cv::Mat *symbol = new cv::Mat[opts.numofblocksX * opts.numofblocksY];
Use an std::vector (recommended):
std::vector<cv::Mat> symbols(opts.numofblocksX * opts.numofblocksY]);