C:\Dev\ANTs\Examples\sccan.cxx(2593,8): warning C4858: discarding return value: The 'remove' and 'remove_if' algorithms return the iterator past the last element that should be kept. You need to call container.erase(result, container.end()) afterwards. In C++20, 'std::erase' and 'std::erase_if' are simpler replacements for these two steps.