[boost] Re: tuple patch (constructing from a pair)

From: Fredrik Blomqvist (fredrik_blomqvist_at_[hidden])
Date: 2005-02-14 09:10:18

This made me remember my own old post about tuples & pairs:
http://lists.boost.org/MailArchives/boost/msg64193.php
i.e to make the tuple::get<> accessor support pairs also.
(actual patches: http://lists.boost.org/MailArchives/boost/msg05245.php)

I spoke to Jaakko about this at the time and he was postivite, but it seems
it ended up in the backlog.. Myself I almost forgot about it during the
summer.
Perhaps this could be reconsidered?

Regards
// Fredrik Blomqvist

John Maddock wrote:
> 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.
>
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