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Investigation: likely the only way to get it to work

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seems to be impossible to get rid of the intermediary argument repackaging delegate call.
As always the reason is that argument packs are no real first class types
This commit is contained in:
Fischlurch 2017-09-27 20:07:51 +02:00
parent 5e3088c45b
commit 3da370000c
1 changed files with 12 additions and 9 deletions
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21
research/try.cpp
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@ -102,6 +102,8 @@ struct Pick
{
return Pick<i-1>::get (args...);
}
static auto get() { return nullptr; }
};
template<>
@ -113,18 +115,22 @@ struct Pick<0>
{
return a;
}
static auto get() { return nullptr; }
};
using Arr = std::array<int, 3>;
template<size_t...idx, typename...ARGS>
void
dispatch_ (IndexSeq<idx...>, ARGS...args)
template<size_t...idx1, size_t...idx2, typename...ARGS>
Arr
dispatch_ (IndexSeq<idx1...>,IndexSeq<idx2...>, ARGS...args)
{
fun2 (Pick<idx>::get(args...) ...);
Arr arr{Pick<idx1>::get(args...) ...};
fun2 (Pick<idx2>::get(args...) ...);
return arr;
}
template<typename...ARGS>
@ -136,10 +142,7 @@ dispatch (ARGS...args)
using First = typename BuildIndexSeq<3>::Ascending;
using Next = typename BuildIndexSeq<3>::OffsetBy<3>;
dispatch_ (First(), args...);
dispatch_ (Next(), args...);
Arr arr{9,8,7};
return arr;
return dispatch_ (First(),Next(), args...);
}