Macro add_static_file_mask

macro_rules! add_static_file_mask {
    ($(#[$attr:meta])* $mask_struct:ident $(<$generic:ident>)?, $type1:ty, $mask:expr) => { ... };
    ($(#[$attr:meta])* $mask_struct:ident $(<$generic:ident>)?, $type1:ty, $type2:ty, $mask:expr) => { ... };
    ($(#[$attr:meta])* $mask_struct:ident $(<$generic:ident>)?, $type1:ty, $type2:ty, $type3:ty, $mask:expr) => { ... };
}

Add mask to select N column values from a specific static file segment row.