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use a std::vector for this:

std::vector<cv::String> fileenames;
cv::glob("/my/images/*.png", filenames); //all png files in that folder

std::vector<cv::Mat> images(filenames.size());
for (size_t i=0; i<filenames.size(); i++) {
    images[i] = cv::imread(filenames[i]);
}

use a std::vector for this:

std::vector<cv::String> fileenames;
filenames;
cv::glob("/my/images/*.png", filenames); //all png files in that folder

std::vector<cv::Mat> images(filenames.size());
for (size_t i=0; i<filenames.size(); i++) {
    images[i] = cv::imread(filenames[i]);
}