Re: [Boost-users] Boost.MPL.Vector -> Boost.Tuple

5 Sep 2008

      AMDG

???? ????? wrote:
...
typedef boost::mpl::vector< A, B, C > Sequence;
typedef typename Question< Sequence >::type Result;
BOOST_MPL_ASSERT( boost::mpl::is_same< Result, boost::tuple< A, B, C > >);
How write Question? I don't want to write specialisation for every dimension
of tuple manually.
Implementation should be compatible with the last stable Boost release
(1.36)
Thank you
#include 
#include 
#include 
#include 
#include 

struct A {};
struct B {};
struct C {};

typedef boost::mpl::vector< A, B, C > Sequence;

template
struct tuple_push_front;

template
struct tuple_push_front > {
typedef boost::tuple type;
};

template<class Sequence>
struct Question {
typedef typename boost::mpl::reverse_copy<
Sequence, boost::mpl::inserter,
tuple_push_front >
...
::type type;
};
typedef Question< Sequence >::type Result;
BOOST_MPL_ASSERT((boost::is_same< Result, boost::tuple< A, B, C > >));

In Christ,
Steven Watanabe