BaseObject.h

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/*
 * Copyright (c) 2015-2024, EPFL/Blue Brain Project
 *
 * Responsible Author: Daniel.Nachbaur@epfl.ch
 *
 * This file is part of Blue Brain BioExplorer <https://github.com/BlueBrain/BioExplorer>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 3.0 as published
 * by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <atomic>
#include <cmath>
#include <functional>
#include <type_traits>
 
namespace core
{
class BaseObject
{
public:
    BaseObject() = default;
    virtual ~BaseObject() = default;
 
    BaseObject(const BaseObject&)
        : _modified(true)
    {
    }
 
    BaseObject& operator=(const BaseObject& rhs)
    {
        if (this == &rhs)
            return *this;
 
        _modified = true;
        return *this;
    }
 
    bool isModified() const { return _modified; }
    void resetModified() { _modified = false; }
    void markModified(const bool triggerCallback = true)
    {
        _modified = true;
        if (_modifiedCallback && triggerCallback)
            _modifiedCallback(*this);
    }
 
    using ModifiedCallback = std::function<void(const BaseObject&)>;
 
    void onModified(const ModifiedCallback& callback) { _modifiedCallback = callback; }
 
    void clearModifiedCallback() { _modifiedCallback = ModifiedCallback(); }
 
protected:
    template <typename T>
    void _updateValue(T& member, const T& newValue, const bool triggerCallback = true)
    {
        if (!_isEqual(member, newValue))
        {
            member = newValue;
            markModified(triggerCallback);
        }
    }
 
    template <class T>
    bool _isEqual(const T& a, const T& b, typename std::enable_if<std::is_floating_point<T>::value>::type* = 0)
    {
        return std::fabs(a - b) < 0.000001;
    }
 
    template <class T>
    bool _isEqual(const T& a, const T& b, typename std::enable_if<!std::is_floating_point<T>::value>::type* = 0)
    {
        return a == b;
    }
 
private:
    std::atomic_bool _modified{true};
    ModifiedCallback _modifiedCallback;
};
} // namespace core