Is this script useless?

library USA

private struct usa

    integer oldUserData
    integer Struct
    
    static method create takes unit a, integer i returns usa
        local usa u = usa.allocate()
        set u.oldUserData = GetUnitUserData(a)
        call SetUnitUserData(a, i)
        set u.Struct = i
        return u
    endmethod
    
endstruct

function USAStore takes unit a, integer s returns nothing
    local usa u = usa.create(a,s)
endfunction

function USAGet takes unit u returns integer
    return usa(GetUnitUserData(u)).Struct
endfunction

function USAReset takes unit u returns nothing
    call SetUnitUserData(u, usa(GetUnitUserData(u)).oldUserData)
    call usa(GetUnitUserData(u)).destroy()
endfunction
 
endlibrary