test(shared_ptr): FieldLocation

tests/fdb/database/CMakeLists.txt

@@ -7,3 +7,8 @@ ecbuild_add_test( TARGET test_fdb5_database_indexaxis
     INCLUDES ${PMEM_INCLUDE_DIRS}
     LIBS fdb5
     ENVIRONMENT "${_test_environment}")
+
+ecbuild_add_test( TARGET test_fdb5_fieldlocation
+    SOURCES test_fieldlocation.cc
+    LIBS fdb5
+    ENVIRONMENT "${_test_environment}")

tests/fdb/database/test_fieldlocation.cc

@@ -0,0 +1,65 @@
+/*
+ * (C) Copyright 1996- ECMWF.
+ *
+ * This software is licensed under the terms of the Apache Licence Version 2.0
+ * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+ * In applying this licence, ECMWF does not waive the privileges and immunities
+ * granted to it by virtue of its status as an intergovernmental organisation nor
+ * does it submit to any jurisdiction.
+ */
+
+#include "fdb5/database/FieldLocation.h"
+
+#include "eckit/filesystem/URI.h"
+#include "eckit/testing/Test.h"
+
+#include <memory>
+
+using namespace eckit;
+using namespace eckit::testing;
+
+namespace fdb::test {
+
+//----------------------------------------------------------------------------------------------------------------------
+
+CASE("FieldLocation - shared_ptr") {
+    URI uri {"dummy_uri"};
+
+    // GOOD (not best)
+    {
+        auto location = std::shared_ptr<fdb5::FieldLocation>(fdb5::FieldLocationFactory::instance().build("file", uri));
+
+        auto loc1 = location->sharedPtr();
+        EXPECT_EQUAL(loc1.use_count(), 2);
+
+        auto loc2 = location->sharedPtr();
+        EXPECT_EQUAL(loc2.use_count(), 3);
+
+        // check that the shared pointers are the same
+        EXPECT_EQUAL(loc2, loc1);
+
+        {
+            auto loc3 = location->sharedPtr();
+            EXPECT_EQUAL(loc3.use_count(), 4);
+            EXPECT_EQUAL(loc3, loc1);
+        }
+
+        auto loc4 = location->sharedPtr();
+        EXPECT_EQUAL(loc4.use_count(), 4);
+        EXPECT_EQUAL(loc4, loc1);
+    }
+
+    // BAD: this is a how NOT to use shared_ptr on FieldLocation
+    {
+        auto location = std::unique_ptr<fdb5::FieldLocation>(fdb5::FieldLocationFactory::instance().build("file", uri));
+        EXPECT_THROWS_AS(location->sharedPtr(), std::bad_weak_ptr);
+    }
+}
+
+//----------------------------------------------------------------------------------------------------------------------
+
+}  // namespace fdb::test
+
+int main(int argc, char** argv) {
+    return run_tests(argc, argv);
+}