Add a test for ranges::contains_subrange

Author: akukanov

test/parallel_api/ranges/std_ranges_contains_subrange.pass.cpp

@@ -0,0 +1,54 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Copyright (C) 2026 UXL Foundation Contributors
+//
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "std_ranges_test.h"
+
+#if _ENABLE_STD_RANGES_TESTING
+    template<int call_id, typename T, typename DataGen2 = std::identity>
+    using launcher = test_std_ranges::test_range_algo<call_id, T, test_std_ranges::data_in_in,
+                                                      /*DataGen1*/ std::identity, DataGen2>;
+#if __cpp_lib_ranges_contains >= 202207L
+    auto checker = TEST_PREPARE_CALLABLE(std::ranges::contains_subrange);
+#else
+    struct {
+        
+        template<std::ranges::forward_range R1, std::ranges::forward_range R2, typename Pred = std::ranges::equal_to,
+                 typename Proj1 = std::identity, typename Proj2 = std::identity>
+        bool operator()(R1&& r1, R2&& r2, Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {})
+        {
+            if (std::ranges::begin(r2) == std::ranges::end(r2))
+                return true;
+            auto&& result = std::ranges::search(r1, r2, pred, proj1, proj2);
+            return !result.empty();
+        }
+    } checker;
+#endif
+#endif
+
+std::int32_t
+main()
+{
+#if _ENABLE_STD_RANGES_TESTING
+    using namespace test_std_ranges;
+    namespace dpl_ranges = oneapi::dpl::ranges;
+
+    auto lam = [](auto i) { return i + 371; };
+    using data_gen_shifted = decltype(lam);
+
+    // Sizes of both sequences will vary in the test, so each call might test both successful and unsuccessful searches
+    launcher<0, int>{big_sz}(dpl_ranges::contains_subrange, checker, binary_pred_const);
+    launcher<1, int>{}(dpl_ranges::contains_subrange, checker);
+    launcher<2, int>{}(dpl_ranges::contains_subrange, checker, binary_pred, dpl::identity{});
+    launcher<3, int, data_gen_shifted>{big_sz}(dpl_ranges::contains_subrange, checker, binary_pred, proj, proj);
+    launcher<4, P3, data_gen_shifted>{}(dpl_ranges::contains_subrange, checker, binary_pred_const, &P3::x, &P3::proj);
+    launcher<5, P3>{}(dpl_ranges::contains_subrange, checker, std::equal_to<>{}, &P3::proj, &P3::y);
+#endif //_ENABLE_STD_RANGES_TESTING
+
+    return TestUtils::done(_ENABLE_STD_RANGES_TESTING);
+}