folly/folly/docs/examples/folly/CancellationCallback.cpp

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * 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 <folly/CancellationToken.h>
#include <folly/portability/GTest.h>

using folly::CancellationCallback;
using folly::CancellationSource;

TEST(CancellationCallback, demo) {
  CancellationSource src;

  bool callbackExecuted = false;
  CancellationCallback cb{src.getToken(), [&] { callbackExecuted = true; }};

  EXPECT_FALSE(callbackExecuted);
  src.requestCancellation();
  EXPECT_TRUE(callbackExecuted);
}