1 files changed, 65 insertions, 0 deletions
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/pstl.transform.unary.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/pstl.transform.unary.pass.cpp
new file mode 100644
index 000000000000..03985c7d3673
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/pstl.transform.unary.pass.cpp
@@ -0,0 +1,65 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// UNSUPPORTED: libcpp-has-no-incomplete-pstl
+
+// <algorithm>
+
+// template<class ExecutionPolicy, class ForwardIterator1, class ForwardIterator2,
+//          class UnaryOperation>
+//   ForwardIterator2
+//     transform(ExecutionPolicy&& exec,
+//               ForwardIterator1 first1, ForwardIterator1 last1,
+//               ForwardIterator2 result, UnaryOperation op);
+
+#include <algorithm>
+#include <cassert>
+#include <vector>
+
+#include "test_macros.h"
+#include "test_execution_policies.h"
+#include "test_iterators.h"
+
+// We can't test the constraint on the execution policy, because that would conflict with the binary
+// transform algorithm that doesn't take an execution policy, which is not constrained at all.
+
+template <class Iter1, class Iter2>
+struct Test {
+  template <class Policy>
+  void operator()(Policy&& policy) {
+    // simple test
+    for (const int size : {0, 1, 2, 100, 350}) {
+      std::vector<int> a(size);
+      for (int i = 0; i != size; ++i)
+        a[i] = i + 1;
+
+      std::vector<int> out(std::size(a));
+      decltype(auto) ret = std::transform(
+          policy, Iter1(std::data(a)), Iter1(std::data(a) + std::size(a)), Iter2(std::data(out)), [](int i) {
+            return i + 3;
+          });
+      static_assert(std::is_same_v<decltype(ret), Iter2>);
+      assert(base(ret) == std::data(out) + std::size(out));
+      for (int i = 0; i != size; ++i)
+        assert(out[i] == i + 4);
+    }
+  }
+};
+
+int main(int, char**) {
+  types::for_each(types::forward_iterator_list<int*>{}, types::apply_type_identity{[](auto v) {
+                    using Iter = typename decltype(v)::type;
+                    types::for_each(
+                        types::forward_iterator_list<int*>{},
+                        TestIteratorWithPolicies<types::partial_instantiation<Test, Iter>::template apply>{});
+                  }});
+
+  return 0;
+}