48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "yarpl/flowable/Subscriber.h"
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#include <stdexcept>
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namespace yarpl {
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namespace flowable {
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/**
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* A Subscriber that always cancels the subscription passed to it.
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*/
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template <typename T>
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class CancelingSubscriber final : public BaseSubscriber<T> {
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public:
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void onSubscribeImpl() override {
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this->cancel();
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}
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void onNextImpl(T) override {
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throw std::logic_error{"CancelingSubscriber::onNext() can never be called"};
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}
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void onCompleteImpl() override {
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throw std::logic_error{
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"CancelingSubscriber::onComplete() can never be called"};
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}
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void onErrorImpl(folly::exception_wrapper) override {
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throw std::logic_error{
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"CancelingSubscriber::onError() can never be called"};
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}
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};
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} // namespace flowable
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} // namespace yarpl
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