pendable_as_task.h

// Copyright 2024 The Pigweed Authors
//
// 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
//
//     https://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.
#pragma once
 
#include <type_traits>
 
#include "pw_async2/dispatcher.h"
 
namespace pw::async2 {
 
template <typename Pendable>
class PendableAsTask : public Task {
 public:
  PendableAsTask(Pendable&& pendable)
      : pendable_(std::forward<Pendable>(pendable)) {}
  Pendable& operator*() { return pendable_; }
  Pendable* operator->() { return &pendable_; }
 
 private:
  Poll<> DoPend(Context& cx) final {
    if constexpr (std::is_pointer_v<Pendable>) {
      return pendable_->Pend(cx);
    } else {
      return pendable_.Pend(cx);
    }
  }
  Pendable pendable_;
};
 
template <typename T>
PendableAsTask(T&&) -> PendableAsTask<T>;
 
}  // namespace pw::async2