c++ create folder if not exist

#define _SILENCE_EXPERIMENTAL_FILESYSTEM_DEPRECATION_WARNING 1;
#include <experimental/filesystem> // or #include <filesystem> for C++17 and up
    
namespace fs = std::experimental::filesystem;

int CreateFolderIfNotExist(std::string folder) {
    if (!fs::is_directory(folder) || !fs::exists(folder)) { // Check if src folder exists
        std::ostringstream oss;
        oss << "mkdir " + folder; // prevent space in source path
        std::string command = oss.str();
        std::cout << command << std::endl;
        system(command.c_str());
    }
    return 0;
}