[Boost-users] boost::format: get expected number of arguments

Hi, I am using boost::format in my project, and I would need to know what is the exact number of arguments expected, because the format is written by the end-user, and the program has no way to know it. I have seen that the format class actually has some attributes with this value, but I couldn't see any public methods to get them. Is there any way of getting the expected number of arguments? Thanks in advance.