[boost] tuple patch (constructing from a pair)

From: John Maddock (john_at_[hidden])
Date: 2005-02-14 07:06:13

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.