84 lines
2.7 KiB
C++
84 lines
2.7 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/single/Single.h"
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#include "yarpl/single/SingleSubscriptions.h"
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#include <folly/functional/Invoke.h>
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namespace yarpl {
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namespace single {
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class Singles {
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public:
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template <typename T>
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static std::shared_ptr<Single<T>> just(const T& value) {
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auto lambda = [value](std::shared_ptr<SingleObserver<T>> observer) {
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observer->onSubscribe(SingleSubscriptions::empty());
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observer->onSuccess(value);
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};
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return Single<T>::create(std::move(lambda));
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}
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template <
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typename T,
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typename OnSubscribe,
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typename = typename std::enable_if<folly::is_invocable<
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OnSubscribe&&,
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std::shared_ptr<SingleObserver<T>>>::value>::type>
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static std::shared_ptr<Single<T>> create(OnSubscribe&& function) {
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return std::make_shared<
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FromPublisherOperator<T, std::decay_t<OnSubscribe>>>(
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std::forward<OnSubscribe>(function));
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}
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template <typename T>
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static std::shared_ptr<Single<T>> error(folly::exception_wrapper ex) {
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auto lambda =
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[e = std::move(ex)](std::shared_ptr<SingleObserver<T>> observer) {
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observer->onSubscribe(SingleSubscriptions::empty());
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observer->onError(e);
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};
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return Single<T>::create(std::move(lambda));
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}
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template <typename T, typename ExceptionType>
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static std::shared_ptr<Single<T>> error(const ExceptionType& ex) {
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auto lambda = [ex](std::shared_ptr<SingleObserver<T>> observer) {
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observer->onSubscribe(SingleSubscriptions::empty());
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observer->onError(ex);
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};
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return Single<T>::create(std::move(lambda));
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}
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template <typename T, typename TGenerator>
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static std::shared_ptr<Single<T>> fromGenerator(TGenerator&& generator) {
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auto lambda = [generator = std::forward<TGenerator>(generator)](
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std::shared_ptr<SingleObserver<T>> observer) mutable {
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observer->onSubscribe(SingleSubscriptions::empty());
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observer->onSuccess(generator());
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};
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return Single<T>::create(std::move(lambda));
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}
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private:
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Singles() = delete;
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};
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} // namespace single
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} // namespace yarpl
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