K-ballo created this revision.
K-ballo added reviewers: mclow.lists, EricWF, majnemer, rsmith.
K-ballo added a subscriber: cfe-commits.
Use the `__make_integer_seq` builtin, introduced by r252036, when available.
This allows for an incredibly fast `std::make_integer_sequence` implementation.
http://reviews.llvm.org/D14814
Files:
include/utility
Index: include/utility
===================================================================
--- include/utility
+++ include/utility
@@ -680,6 +680,16 @@
template<size_t... _Ip>
using index_sequence = integer_sequence<size_t, _Ip...>;
+#if __has_builtin(__make_integer_seq)
+
+template <class _Tp, _Tp _Ep>
+struct __make_integer_sequence
+{
+ typedef __make_integer_seq<integer_sequence, _Tp, _Ep> type;
+};
+
+#else
+
namespace __detail {
template<typename _Tp, size_t ..._Extra> struct __repeat;
@@ -737,6 +747,8 @@
typedef __make_integer_sequence_unchecked<_Tp, _Ep> type;
};
+#endif
+
template<class _Tp, _Tp _Np>
using make_integer_sequence = typename __make_integer_sequence<_Tp,
_Np>::type;
Index: include/utility
===================================================================
--- include/utility
+++ include/utility
@@ -680,6 +680,16 @@
template<size_t... _Ip>
using index_sequence = integer_sequence<size_t, _Ip...>;
+#if __has_builtin(__make_integer_seq)
+
+template <class _Tp, _Tp _Ep>
+struct __make_integer_sequence
+{
+ typedef __make_integer_seq<integer_sequence, _Tp, _Ep> type;
+};
+
+#else
+
namespace __detail {
template<typename _Tp, size_t ..._Extra> struct __repeat;
@@ -737,6 +747,8 @@
typedef __make_integer_sequence_unchecked<_Tp, _Ep> type;
};
+#endif
+
template<class _Tp, _Tp _Np>
using make_integer_sequence = typename __make_integer_sequence<_Tp, _Np>::type;
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