Add multimap find test

tests/CMakeLists.txt

@@ -114,6 +114,7 @@ ConfigureTest(STATIC_MULTIMAP_TEST
     static_multimap/count_test.cu
     static_multimap/custom_pair_retrieve_test.cu
     static_multimap/custom_type_test.cu
+    static_multimap/find_test.cu
     static_multimap/heterogeneous_lookup_test.cu
     static_multimap/insert_contains_test.cu
     static_multimap/insert_if_test.cu

tests/static_multimap/find_test.cu

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2024, NVIDIA CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <test_utils.hpp>
+
+#include <cuco/static_multimap.cuh>
+
+#include <cuda/functional>
+#include <thrust/device_vector.h>
+#include <thrust/functional.h>
+#include <thrust/iterator/constant_iterator.h>
+#include <thrust/iterator/transform_iterator.h>
+
+#include <catch2/catch_template_test_macros.hpp>
+
+using size_type = int32_t;
+
+template <typename Map>
+void test_multimap_find(Map& map, size_type num_keys)
+{
+  using Key   = typename Map::key_type;
+  using Value = typename Map::mapped_type;
+
+  auto zip_equal = cuda::proclaim_return_type<bool>(
+    [] __device__(auto val) { return thrust::get<0>(val) == thrust::get<1>(val); });
+
+  auto const keys_begin = thrust::counting_iterator<Key>{0};
+
+  SECTION("Non-inserted keys have no matches")
+  {
+    thrust::device_vector<Value> found_vals(num_keys);
+
+    map.find(keys_begin, keys_begin + num_keys, found_vals.begin());
+    auto zip = thrust::make_zip_iterator(thrust::make_tuple(
+      found_vals.begin(), thrust::constant_iterator<Value>{map.empty_value_sentinel()}));
+
+    REQUIRE(cuco::test::all_of(zip, zip + num_keys, zip_equal));
+  }
+
+  auto const pairs_begin = thrust::make_transform_iterator(
+    thrust::make_counting_iterator<size_type>(0),
+    cuda::proclaim_return_type<cuco::pair<Key, Value>>(
+      [] __device__(auto i) { return cuco::pair<Key, Value>{i, i * 2}; }));
+
+  map.insert(pairs_begin, pairs_begin + num_keys);
+
+  SECTION("All inserted keys should be correctly recovered during find")
+  {
+    thrust::device_vector<Value> found_vals(num_keys);
+
+    map.find(keys_begin, keys_begin + num_keys, found_vals.begin());
+
+    auto const gold_vals_begin = thrust::make_transform_iterator(
+      thrust::make_counting_iterator<size_type>(0),
+      cuda::proclaim_return_type<Value>([] __device__(auto i) { return Value{i * 2}; }));
+    auto zip = thrust::make_zip_iterator(thrust::make_tuple(found_vals.begin(), gold_vals_begin));
+
+    REQUIRE(cuco::test::all_of(zip, zip + num_keys, zip_equal));
+  }
+}
+
+TEMPLATE_TEST_CASE_SIG(
+  "static_multimap find tests",
+  "",
+  ((typename T, cuco::test::probe_sequence Probe, int CGSize), T, Probe, CGSize),
+  (int32_t, cuco::test::probe_sequence::double_hashing, 1),
+  (int32_t, cuco::test::probe_sequence::double_hashing, 2),
+  (int64_t, cuco::test::probe_sequence::double_hashing, 1),
+  (int64_t, cuco::test::probe_sequence::double_hashing, 2),
+  (int32_t, cuco::test::probe_sequence::linear_probing, 1),
+  (int32_t, cuco::test::probe_sequence::linear_probing, 2),
+  (int64_t, cuco::test::probe_sequence::linear_probing, 1),
+  (int64_t, cuco::test::probe_sequence::linear_probing, 2))
+{
+  constexpr size_type num_keys{1'000};
+
+  using probe = std::conditional_t<
+    Probe == cuco::test::probe_sequence::linear_probing,
+    cuco::linear_probing<CGSize, cuco::default_hash_function<T>>,
+    cuco::double_hashing<CGSize, cuco::default_hash_function<T>, cuco::default_hash_function<T>>>;
+
+  auto map = cuco::experimental::static_multimap<T,
+                                                 T,
+                                                 cuco::extent<size_type>,
+                                                 cuda::thread_scope_device,
+                                                 thrust::equal_to<T>,
+                                                 probe,
+                                                 cuco::cuda_allocator<cuda::std::byte>,
+                                                 cuco::storage<2>>{
+    num_keys, cuco::empty_key<T>{-1}, cuco::empty_value<T>{-2}};
+
+  test_multimap_find(map, num_keys);
+}