Re: [Boost-users] a tuple from a pair?

Subject: Re: [Boost-users] a tuple from a pair?
From: Krzysztof Żelechowski (giecrilj_at_[hidden])
Date: 2011-10-07 05:18:24

Lars Viklund wrote:

> Are you sure you're not misunderstanding what your implementation does?
> VC10 and GCC 4.4.5 makes (rightfully so) a 1-tuple with an element of
> type pair<T1,T2> when invoking make_tuple with a pair.
> 

What I mean is this:

#include <boost/tuple/tuple.hpp>
void trigger (::std:: pair < int, int > const &p) 
{ ::boost:: get < 0 > (::boost:: tuple < int, int > (p)) == p. first; }

error: 
no matching function for call 
to ‘boost::tuples::tuple<int, int>::tuple(const std::pair<int, int>&)’

Compare:

#include <tr1/tuple>
void trigger (::std:: pair < int, int > const &p) 
{ 
::std:: tr1:: get < 0 > (::std:: tr1:: tuple < int, int > (p)) == p. first; 
}

I guess this, and Joel’s comment about boost fusion, means boost tuple 
should be deprecated.

Chris