2 files changed, 151 insertions, 0 deletions
diff --git a/libcxx/test/std/containers/sequences/array/array.overview/nttp.equivalence.compile.pass.cpp b/libcxx/test/std/containers/sequences/array/array.overview/nttp.equivalence.compile.pass.cpp
new file mode 100644
index 000000000000..29e10fd40bd3
--- /dev/null
+++ b/libcxx/test/std/containers/sequences/array/array.overview/nttp.equivalence.compile.pass.cpp
@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <array>
+
+// LWG-3382 NTTP for pair and array:
+// Two values a1 and a2 of type array<T, N> are template-argument-equivalent if and only if each pair of corresponding
+// elements in a1 and a2 are template-argument-equivalent.
+
+#include <array>
+
+#include <type_traits>
+
+namespace test_full_type {
+template <class T, std::size_t S, std::array<T, S> A>
+struct test : std::false_type {};
+
+template <>
+struct test<int, 3, std::array<int, 3>{1, 2, 3}> : std::true_type {};
+
+static_assert(!test<int*, 4, std::array<int*, 4>{}>::value);
+static_assert(!test<int*, 3, std::array<int*, 3>{}>::value);
+static_assert(!test<int, 3, std::array<int, 3>{}>::value);
+static_assert(!test<int, 3, std::array<int, 3>{1}>::value);
+static_assert(!test<int, 3, std::array<int, 3>{1, 2}>::value);
+static_assert(!test<long, 3, std::array<long, 3>{1, 2, 3}>::value);
+static_assert(!test<unsigned int, 3, std::array<unsigned int, 3>{1, 2, 3}>::value);
+static_assert(test<int, 3, std::array<int, 3>{1, 2, 3}>::value);
+} // namespace test_full_type
+
+namespace test_ctad {
+template <std::array A>
+struct test : std::false_type {};
+
+template <>
+struct test<std::array<int, 3>{4, 5, 6}> : std::true_type {};
+
+static_assert(!test<std::array<int*, 4>{}>::value);
+static_assert(!test<std::array<int*, 3>{}>::value);
+static_assert(!test<std::array<int, 3>{}>::value);
+static_assert(!test<std::array<int, 3>{4}>::value);
+static_assert(!test<std::array<int, 3>{4, 5}>::value);
+static_assert(!test<std::array<long, 3>{4, 5, 6}>::value);
+static_assert(!test<std::array<unsigned int, 3>{4, 5, 6}>::value);
+static_assert(test<std::array<int, 3>{4, 5, 6}>::value);
+} // namespace test_ctad
+
+namespace test_auto {
+template <auto A>
+struct test : std::false_type {};
+
+template <>
+struct test<std::array<int, 3>{7, 8, 9}> : std::true_type {};
+
+static_assert(!test<std::array<int*, 4>{}>::value);
+static_assert(!test<std::array<int*, 3>{}>::value);
+static_assert(!test<std::array<int, 3>{}>::value);
+static_assert(!test<std::array<int, 3>{7}>::value);
+static_assert(!test<std::array<int, 3>{7, 8}>::value);
+static_assert(!test<std::array<long, 3>{7, 8, 9}>::value);
+static_assert(!test<std::array<unsigned int, 3>{7, 8, 9}>::value);
+static_assert(test<std::array<int, 3>{7, 8, 9}>::value);
+} // namespace test_auto
diff --git a/libcxx/test/std/containers/sequences/array/array.overview/nttp.verify.cpp b/libcxx/test/std/containers/sequences/array/array.overview/nttp.verify.cpp
new file mode 100644
index 000000000000..3eb8e2596f85
--- /dev/null
+++ b/libcxx/test/std/containers/sequences/array/array.overview/nttp.verify.cpp
@@ -0,0 +1,81 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <array>
+
+// LWG-3382 NTTP for pair and array:
+// array<T, N> is a structural type ([temp.param]) if T is a structural type.
+
+#include <array>
+
+#include <cstddef>
+#include <string>
+
+struct LiteralBase {};
+struct LiteralNSDM {};
+
+struct LiteralType : LiteralBase {
+  LiteralNSDM nsdm;
+};
+
+struct NotALiteral {
+  NotALiteral() {}
+};
+
+int i;
+NotALiteral not_a_literal;
+
+namespace test_full_type {
+template <class T, std::size_t S, std::array<T, S> A>
+struct test {};
+
+using A = test<int, 2, std::array{2, 3}>;
+using B = test<LiteralType, 0, std::array<LiteralType, 0>{}>;
+using C = test<int*, 1, std::array<int*, 1>{&i}>;
+using D = test<NotALiteral*, 1, std::array<NotALiteral*, 1>{&not_a_literal}>;
+
+using E = test<NotALiteral, 1, std::array<NotALiteral, 1>{}>;
+// expected-error-re@*:* {{non-type template parameter has non-literal type 'std::array<NotALiteral, 1U{{L{0,2}.*}}>'}}
+
+using F = test<std::string, 2, std::array<std::string, 2>{}>;
+// expected-error-re@*:* {{type 'std::array<{{(std::)?}}string, 2U{{L{0,2}.*}}>' {{(\(aka 'array<basic_string<char>, 2UL{0,2}>'\) )?}}of non-type template parameter is not a structural type}}
+} // namespace test_full_type
+
+namespace test_ctad {
+template <std::array A>
+struct test {};
+
+using A = test<std::array{2, 3}>;
+using B = test<std::array<LiteralType, 0>{}>;
+using C = test<std::array<int*, 1>{&i}>;
+using D = test<std::array<NotALiteral*, 1>{&not_a_literal}>;
+
+using E = test<std::array<NotALiteral, 1>{}>;
+// expected-error@-1 {{non-type template parameter has non-literal type 'std::array<NotALiteral, 1>'}}
+
+using F = test<std::array<std::string, 2>{}>;
+// expected-error@-1 {{type 'std::array<string, 2>' (aka 'std::array<std::string, 2>') of non-type template parameter is not a structural type}}
+} // namespace test_ctad
+
+namespace test_auto {
+template <auto A>
+struct test {};
+
+using A = test<std::array{2, 3}>;
+using B = test<std::array<LiteralType, 0>{}>;
+using C = test<std::array<int*, 1>{&i}>;
+using D = test<std::array<NotALiteral*, 1>{&not_a_literal}>;
+
+using E = test<std::array<NotALiteral, 1>{}>;
+// expected-error@-1 {{non-type template parameter has non-literal type 'std::array<NotALiteral, 1>'}}
+
+using F = test<std::array<std::string, 2>{}>;
+// expected-error@-1 {{type 'std::array<std::string, 2>' (aka 'array<basic_string<char>, 2>') of non-type template parameter is not a structural type}}
+} // namespace test_auto