[boost] tuple patch (constructing from a pair)

14 Feb 2005

      The following simple patch to tuple_basic.hpp allows tuples to be 
constructed from std::pairs (there is already an assignment operator, but 
the copy constructor is missing for some reason, and is required for TR1 
conformity).

RCS file: /cvsroot/boost/boost/boost/tuple/detail/tuple_basic.hpp,v
retrieving revision 1.28
diff -r1.28 tuple_basic.hpp
627a628,636
...
template <class T, class U>
     tuple(const std::pair<T, U>& p)
    : inherited(p.first, p.second, detail::cnull(), detail::cnull(),
                detail::cnull(), detail::cnull(), detail::cnull(),
                detail::cnull(), detail::cnull(), detail::cnull())
  {
    BOOST_STATIC_ASSERT(length<tuple>::value == 2);// check_length = 2
  }
Is it acceptable to add this?

Many thanks,

John Maddock.