Implement n3658 - Compile-time integer sequences

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@185343 91177308-0d34-0410-b5e6-96231b3b80d8

test/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
+}

test/utilities/intseq/intseq.intseq/integer_seq.fail.cpp

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// template<class T, T... I>
+// struct integer_sequence
+// {
+//     typedef T type;
+// 
+//     static constexpr size_t size() noexcept;
+// };
+
+// This test is a conforming extension.  The extension turns undefined behavior
+//  into a compile-time error.
+
+#include <utility>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+
+//  Should fail to compile, since float is not an integral type
+    using floatmix = std::integer_sequence<float>;
+    floatmix::value_type I;
+
+#else
+
+X
+
+#endif  // _LIBCPP_STD_VER > 11
+}

test/utilities/intseq/intseq.intseq/integer_seq.pass.cpp

@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// template<class T, T... I>
+// struct integer_sequence
+// {
+//     typedef T type;
+// 
+//     static constexpr size_t size() noexcept;
+// };
+
+#include <utility>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+
+//  Make a few of sequences
+    using int3    = std::integer_sequence<int, 3, 2, 1>;
+    using size1   = std::integer_sequence<size_t, 7>;
+    using ushort2 = std::integer_sequence<unsigned short, 4, 6>;
+    using bool0   = std::integer_sequence<bool>;
+    
+//  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<size1::value_type, size_t>::value, "size1 type wrong" );
+    static_assert ( size1::size() == 1, "size1 size wrong" );
+    
+    static_assert ( std::is_same<ushort2::value_type, unsigned short>::value, "ushort2 type wrong" );
+    static_assert ( ushort2::size() == 2, "ushort2 size wrong" );
+    
+    static_assert ( std::is_same<bool0::value_type, bool>::value, "bool0 type wrong" );
+    static_assert ( bool0::size() == 0, "bool0 size wrong" );
+    
+#endif  // _LIBCPP_STD_VER > 11
+}

test/utilities/intseq/intseq.make/make_integer_seq.fail.cpp

@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// template<class T, T N>
+//   using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
+
+#include <utility>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+
+    std::make_integer_sequence<int, -3>::value_type i;
+
+#else
+
+X
+
+#endif  // _LIBCPP_STD_VER > 11
+}

test/utilities/intseq/intseq.make/make_integer_seq.pass.cpp

@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// template<class T, T N>
+//   using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
+
+#include <utility>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+
+    static_assert(std::is_same<std::make_integer_sequence<int, 0>, std::integer_sequence<int>>::value, "");
+    static_assert(std::is_same<std::make_integer_sequence<int, 1>, std::integer_sequence<int, 0>>::value, "");
+    static_assert(std::is_same<std::make_integer_sequence<int, 2>, std::integer_sequence<int, 0, 1>>::value, "");
+    static_assert(std::is_same<std::make_integer_sequence<int, 3>, std::integer_sequence<int, 0, 1, 2>>::value, "");
+
+    static_assert(std::is_same<std::make_integer_sequence<unsigned long long, 0>, std::integer_sequence<unsigned long long>>::value, "");
+    static_assert(std::is_same<std::make_integer_sequence<unsigned long long, 1>, std::integer_sequence<unsigned long long, 0>>::value, "");
+    static_assert(std::is_same<std::make_integer_sequence<unsigned long long, 2>, std::integer_sequence<unsigned long long, 0, 1>>::value, "");
+    static_assert(std::is_same<std::make_integer_sequence<unsigned long long, 3>, std::integer_sequence<unsigned long long, 0, 1, 2>>::value, "");
+
+#endif  // _LIBCPP_STD_VER > 11
+}

test/utilities/intseq/nothing_to_do.pass.cpp

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+int main()
+{
+}