Task.hpp

// SPDX-FileCopyrightText: 2025 Vincent Leroy
// SPDX-License-Identifier: MIT
//
// This file is part of dfx.
//
// Licensed under the MIT License. See the LICENSE file in the project root
// for full license information.
 
#pragma once
 
// Standard includes
#include <concepts>
#include <memory>
 
// Project includes
#include <dfx-utilities/CopyMoveControl.hpp>
 
namespace dfx::Runtime
{
class Task;

template<typename T>
concept DerivedFromTask = std::derived_from<T, Task>;

class Task
{
public:
    Task(int priority = 0)
        : _priority { priority }
    {}

    DISABLE_COPY_AND_MOVE(Task);

    virtual ~Task() = default;

    int priority() const noexcept { return _priority; }

    virtual void run() = 0;

    template<DerivedFromTask T>
    T & as() { return static_cast<T &>(*this); }

    template<DerivedFromTask T>
    T const & as() const { return static_cast<T const &>(*this); }
 
private:
    // High value == high priority == work done sooner
    int _priority;
};

using TaskPtr = std::unique_ptr<Task>;
} // !namespace dfx::Runtime