Add OLP_SDK_USE_STD_ANY handling into CMakeFile and one test case

* Add handling of the OLP_SDK_USE_STD_ANY in CMakeFile to propagate it
  durintg the build.
* Add one additional test case to improve code coverage.

Relates-To: NLAM-157
Signed-off-by: Khomenko Denys <[email protected]>

Author: khomenkd

olp-cpp-sdk-core/CMakeLists.txt

@@ -451,6 +451,11 @@ if (OLP_SDK_USE_STD_OPTIONAL)
         PUBLIC OLP_CPP_SDK_USE_STD_OPTIONAL)
 endif()
 
+if (OLP_SDK_USE_STD_ANY)
+    target_compile_definitions(${PROJECT_NAME}
+        PUBLIC OLP_SDK_USE_STD_ANY)
+endif()
+
 target_include_directories(${PROJECT_NAME} PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>

olp-cpp-sdk-core/tests/cache/DefaultCacheImplTest.cpp

@@ -1447,4 +1447,49 @@ std::vector<OpenTestParameters> DefaultCacheImplOpenParams() {
 INSTANTIATE_TEST_SUITE_P(, DefaultCacheImplOpenTest,
                          testing::ValuesIn(DefaultCacheImplOpenParams()));
 
+TEST_F(DefaultCacheImplTest, ProtectedCacheIOErrorFallbackToReadOnly) {
+  SCOPED_TRACE("IOError fallback to read-only for protected cache");
+
+  // Create a writable directory with a subdirectory named "LOCK" to force
+  // LevelDB to fail when trying to create its lock file, triggering IOError.
+  // This exercises the fallback branch (lines 787-789) that retries opening
+  // in read-only mode after an IOError in write mode.
+  const std::string ioerror_path =
+      olp::utils::Dir::TempDirectory() + "/unittest_ioerror_fallback";
+
+  // Clean up any previous leftovers
+  if (olp::utils::Dir::Exists(ioerror_path)) {
+    helpers::MakeDirectoryAndContentReadonly(ioerror_path, false);
+    ASSERT_TRUE(olp::utils::Dir::Remove(ioerror_path));
+  }
+
+  ASSERT_TRUE(olp::utils::Dir::Create(ioerror_path));
+
+  // Create a subdirectory named LOCK to block LevelDB's lock file creation
+  ASSERT_TRUE(olp::utils::Dir::Create(ioerror_path + "/LOCK"));
+
+  // Ensure the directory is writable so IsReadOnly() returns false,
+  // forcing the first open attempt in R/W mode
+  ASSERT_FALSE(olp::utils::Dir::IsReadOnly(ioerror_path));
+
+  cache::CacheSettings settings;
+  settings.disk_path_protected = ioerror_path;
+  DefaultCacheImplHelper cache(settings);
+
+  // Open should attempt R/W first, get IOError due to LOCK directory,
+  // then retry in read-only mode (lines 787-789).
+  auto open_result = cache.Open();
+
+  // The fallback may or may not succeed depending on LevelDB behavior,
+  // but the important part is that the fallback code path executes.
+  // We accept Success or various failure results.
+  EXPECT_TRUE(open_result == cache::DefaultCache::StorageOpenResult::Success ||
+              open_result == cache::DefaultCache::StorageOpenResult::ProtectedCacheCorrupted ||
+              open_result == cache::DefaultCache::StorageOpenResult::OpenDiskPathFailure);
+
+  // Cleanup
+  helpers::MakeDirectoryAndContentReadonly(ioerror_path, false);
+  ASSERT_TRUE(olp::utils::Dir::Remove(ioerror_path));
+}
+
 }  // namespace