Based on what I’ve found here: https://en.cppreference.com/w/cpp/filesystem/permissions I’ve tried to programmatically set the folder permission to write, in order to be able to programmatically create a subfolder.

    void demo_perms(std::filesystem::perms p)
    {
        using std::filesystem::perms;
        auto show = [=](char op, perms perm)
        {
            std::cout << (perms::none == (perm & p) ? '-' : op);
        };
        show('r', perms::owner_read);
        show('w', perms::owner_write);
        show('x', perms::owner_exec);
        show('r', perms::group_read);
        show('w', perms::group_write);
        show('x', perms::group_exec);
        show('r', perms::others_read);
        show('w', perms::others_write);
        show('x', perms::others_exec);
        std::cout << 'n';
    }

    cwd = std::filesystem::current_path();
    std::filesystem::permissions(
        cwd,
        std::filesystem::perms::owner_all | std::filesystem::perms::group_all,
        std::filesystem::perm_options::add
    );
    demo_perms(std::filesystem::status(cwd).permissions());
        
    if(!std::filesystem::exists(graspdatafolderpath))
    {
        std::filesystem::create_directory("/GraspData");
    }

Ouput:

    rwxrwxr-x
    Unhandled standard exception of type "NSt10filesystem7__cxx1116filesystem_errorE" with message "filesystem error: cannot create directory: Permission denied [/GraspData]"; terminating the application

But, as, you can see, what I’ve tried, does not work

How to make it work?