1 files changed, 86 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp b/libcxx/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp
new file mode 100644
index 00000000000..8ca5a96a4fa
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+++ b/libcxx/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp
@@ -0,0 +1,86 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <utility>
+
+// class make_integer_sequence
+
+#include <tuple>
+#include <utility>
+#include <type_traits>
+#include <cassert>
+
+#if _LIBCPP_STD_VER > 11
+
+template <typename AtContainer, typename T, T... I>
+auto extract ( const AtContainer &t, const std::integer_sequence<T, I...> idx )
+-> decltype ( std::make_tuple ( std::get<I>(t)... ))
+{     return  std::make_tuple ( std::get<I>(t)... ); }
+
+#endif  // _LIBCPP_STD_VER > 11
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+
+//  Make a couple of sequences
+    using int3    = std::make_integer_sequence<int, 3>;     // generates int:    0,1,2
+    using size7   = std::make_integer_sequence<size_t, 7>;  // generates size_t: 0,1,2,3,4,5,6
+    using size4   = std::make_index_sequence<4>;            // generates size_t: 0,1,2,3
+    using size2   = std::index_sequence_for<int, size_t>;   // generates size_t: 0,1
+    using intmix  = std::integer_sequence<int, 9, 8, 7, 2>; // generates int:    9,8,7,2
+    using sizemix = std::index_sequence<1, 1, 2, 3, 5>;     // generates size_t: 1,1,2,3,5
+    
+//  Make sure they're what we expect
+    static_assert ( std::is_same<int3::value_type, int>::value, "int3 type wrong" );
+    static_assert ( int3::size () == 3, "int3 size wrong" );
+    
+    static_assert ( std::is_same<size7::value_type, size_t>::value, "size7 type wrong" );
+    static_assert ( size7::size () == 7, "size7 size wrong" );
+    
+    static_assert ( std::is_same<size4::value_type, size_t>::value, "size4 type wrong" );
+    static_assert ( size4::size () == 4, "size4 size wrong" );
+    
+    static_assert ( std::is_same<size2::value_type, size_t>::value, "size2 type wrong" );
+    static_assert ( size2::size () == 2, "size2 size wrong" );
+    
+    static_assert ( std::is_same<intmix::value_type, int>::value, "intmix type wrong" );
+    static_assert ( intmix::size () == 4, "intmix size wrong" );
+
+    static_assert ( std::is_same<sizemix::value_type, size_t>::value, "sizemix type wrong" );
+    static_assert ( sizemix::size () == 5, "sizemix size wrong" );
+
+    auto tup = std::make_tuple ( 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 );
+    
+//  Use them
+    auto t3 = extract ( tup, int3() );
+    static_assert ( std::tuple_size<decltype(t3)>::value == int3::size (), "t3 size wrong");
+    assert ( t3 == std::make_tuple ( 10, 11, 12 ));
+
+    auto t7 = extract ( tup, size7 ());
+    static_assert ( std::tuple_size<decltype(t7)>::value == size7::size (), "t7 size wrong");
+    assert ( t7 == std::make_tuple ( 10, 11, 12, 13, 14, 15, 16 ));
+
+    auto t4 = extract ( tup, size4 ());
+    static_assert ( std::tuple_size<decltype(t4)>::value == size4::size (), "t4 size wrong");
+    assert ( t4 == std::make_tuple ( 10, 11, 12, 13 ));
+
+    auto t2 = extract ( tup, size2 ());
+    static_assert ( std::tuple_size<decltype(t2)>::value == size2::size (), "t2 size wrong");
+    assert ( t2 == std::make_tuple ( 10, 11 ));
+
+    auto tintmix = extract ( tup, intmix ());
+    static_assert ( std::tuple_size<decltype(tintmix)>::value == intmix::size (), "tintmix size wrong");
+    assert ( tintmix == std::make_tuple ( 19, 18, 17, 12 ));
+
+    auto tsizemix = extract ( tup, sizemix ());
+    static_assert ( std::tuple_size<decltype(tsizemix)>::value == sizemix::size (), "tsizemix size wrong");
+    assert ( tsizemix == std::make_tuple ( 11, 11, 12, 13, 15 ));
+#endif  // _LIBCPP_STD_VER > 11
+}