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Commit patch for integer sequences. Suggested by Richard, reworked by Howard, and annotated by me 

llvm-svn: 185569
This commit is contained in:
Marshall Clow 2013-07-03 19:20:30 +00:00
parent 9b64ec18c1
commit 60df5996a4
1 changed files with 45 additions and 21 deletions
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66
libcxx/include/utility
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@ -602,7 +602,7 @@ get(pair<_T1, _T2>&& __p) _NOEXCEPT
#if _LIBCPP_STD_VER > 11
template<class _Tp, _Tp... _Ip>
struct integer_sequence
struct _LIBCPP_TYPE_VIS integer_sequence
{
typedef _Tp value_type;
static_assert( is_integral<_Tp>::value,
@ -617,26 +617,53 @@ struct integer_sequence
template<size_t... _Ip>
using index_sequence = integer_sequence<size_t, _Ip...>;
template <class _Tp, _Tp _Sp, _Tp _Ep, class _IntSequence>
struct __make_integer_sequence_unchecked;
namespace __detail {
template <class _Tp, _Tp _Sp, _Tp _Ep, _Tp ..._Indices>
struct __make_integer_sequence_unchecked<_Tp, _Sp, _Ep,
integer_sequence<_Tp, _Indices...>>
{
typedef typename __make_integer_sequence_unchecked
<
_Tp, _Sp+1, _Ep,
integer_sequence<_Tp, _Indices..., _Sp>
>::type type;
template<typename _Tp, size_t ..._Extra> struct __repeat;
template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<integer_sequence<_Tp, _Np...>, _Extra...> {
typedef integer_sequence<_Tp,
_Np...,
sizeof...(_Np) + _Np...,
2 * sizeof...(_Np) + _Np...,
3 * sizeof...(_Np) + _Np...,
4 * sizeof...(_Np) + _Np...,
5 * sizeof...(_Np) + _Np...,
6 * sizeof...(_Np) + _Np...,
7 * sizeof...(_Np) + _Np...,
_Extra...> type;
};
template <class _Tp, _Tp _Ep, _Tp ..._Indices>
struct __make_integer_sequence_unchecked<_Tp, _Ep, _Ep,
integer_sequence<_Tp, _Indices...>>
{
typedef integer_sequence<_Tp, _Indices...> type;
template<size_t _Np> struct __parity;
template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};
template<> struct __make<0> { typedef integer_sequence<size_t> type; };
template<> struct __make<1> { typedef integer_sequence<size_t, 0> type; };
template<> struct __make<2> { typedef integer_sequence<size_t, 0, 1> type; };
template<> struct __make<3> { typedef integer_sequence<size_t, 0, 1, 2> type; };
template<> struct __make<4> { typedef integer_sequence<size_t, 0, 1, 2, 3> type; };
template<> struct __make<5> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
template<> struct __make<6> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
template<> struct __make<7> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };
template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
template<typename _Tp, typename _Up> struct __convert {
template<typename> struct __result;
template<_Tp ..._Np> struct __result<integer_sequence<_Tp, _Np...> > { typedef integer_sequence<_Up, _Np...> type; };
};
template<typename _Tp> struct __convert<_Tp, _Tp> { template<typename _Up> struct __result { typedef _Up type; }; };
}
template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked =
typename __detail::__convert<size_t, _Tp>::template __result<typename __detail::__make<_Np>::type>::type;
template <class _Tp, _Tp _Ep>
struct __make_integer_sequence
@ -644,10 +671,7 @@ struct __make_integer_sequence
static_assert(is_integral<_Tp>::value,
"std::make_integer_sequence can only be instantiated with an integral type" );
static_assert(0 <= _Ep, "std::make_integer_sequence input shall not be negative");
typedef typename __make_integer_sequence_unchecked
<
_Tp, 0, _Ep, integer_sequence<_Tp>
>::type type;
typedef __make_integer_sequence_unchecked<_Tp, _Ep> type;
};
template<class _Tp, _Tp _Np>