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Investigation: basically working yet convoluted solution draft

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This commit is contained in:
Fischlurch 2017-09-27 00:26:04 +02:00
parent 97727a6283
commit 23cc0597b5
1 changed files with 52 additions and 20 deletions
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72
research/try.cpp
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@ -86,41 +86,73 @@ fun2 (int const& i, int const& j, int const& k)
}
template<size_t...idx>
struct Idx
{ };
/** Hold a sequence of index numbers as template parameters */
template<size_t...idx>
struct IndexSeq
{
template<size_t i>
using AppendElm = IndexSeq<idx..., i>;
};
/** build an `IndexSeq<0, 1, 2, ..., n-1>` */
template<size_t n>
struct BuildIndexSeq
{
using Ascending = typename BuildIndexSeq<n-1>::Ascending::template AppendElm<n-1>;
template<size_t i>
using FilledWith = typename BuildIndexSeq<n-1>::template FilledWith<i>::template AppendElm<i>;
};
template<>
struct BuildIndexSeq<0>
{
using Ascending = IndexSeq<>;
template<size_t>
using FilledWith = IndexSeq<>;;
};
template<typename...ARGS>
struct IdxSeq
{
template<size_t>
struct First
template<size_t i, typename...ARGS>
struct Pick;
template<size_t i, typename ARG, typename...ARGS>
struct Pick<i, ARG,ARGS...>
: Pick<i-1, ARGS...>
{
static auto
get (ARG, ARGS ...args)
{
};
return Pick<i-1, ARGS...>::get (args...);
}
};
template<size_t...idx>
struct Pick
{
template<typename...ARGS>
Pick (ARGS... args)
{ }
template<typename ARG, typename...ARGS>
struct Pick<0, ARG,ARGS...>
{
static ARG
get (ARG a, ARGS...)
{
return a;
}
};
template<size_t...idx, typename...ARGS>
void
dispatch (Idx<idx...>, ARGS...args)
dispatch_ (IndexSeq<idx...>, ARGS...args)
{
fun1 (Pick<idx>{args...} ...);
fun1 (Pick<idx,ARGS...>::get(args...) ...);
}
template<typename...ARGS>
void
dispatch (ARGS...args)
{
using First = typename IdxSeq<ARGS...>::template First<3>;
enum {SIZ = sizeof...(args)};
using First = typename BuildIndexSeq<3>::Ascending;
dispatch_ (First{}, args...);
}
@ -132,7 +164,7 @@ main (int, char**)
fun1 (1,2,3);
fun2 (4,5,6);
// dispatch (2,3,4,5,6,7,8);
dispatch (2,3,4,5,6,7,8);
cout << "\n.gulp.\n";