AVPointer.hxx

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/*
 * Copyright (C) 2024-2026 David C. Manuelda (StormBytePP)
 *
 * This file is part of StormByte-Multimedia.
 *
 * StormByte-Multimedia original source is dual-licensed:
 *
 * 1. GNU Lesser General Public License v3.0 (or later)
 *    You may redistribute and/or modify this file under the terms of the
 *    GNU Lesser General Public License as published by the Free Software
 *    Foundation, either version 3 of the License, or (at your option)
 *    any later version.
 *
 * 2. Commercial license
 *    Alternatively, this file may be used under the terms of a commercial
 *    license agreement with the copyright holder
 *    (David C. Manuelda <StormByte@gmail.com>).
 *
 * Both licenses apply only to original StormByte-Multimedia source in this
 * file. Third-party components — including FFmpeg and embedded trained data —
 * remain under their own licenses and are not covered by the commercial grant.
 *
 * Neither license grants any patent rights. Any patent licenses required
 * to use this software or third-party components must be obtained separately
 * from the patent holders.
 *
 * StormByte-Multimedia 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
 * version 3 along with StormByte-Multimedia. If not, see
 * <https://www.gnu.org/licenses/lgpl-3.0.html>.
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-StormByte-Commercial
 */
 
#pragma once
 
#include <StormByte/multimedia/visibility.h>
#include <StormByte/type_traits.hxx>
 
namespace StormByte::Multimedia::FFmpeg {
    template<typename AVType>
    class STORMBYTE_MULTIMEDIA_PUBLIC AVPointer {
        public:
            constexpr AVPointer() noexcept = delete;
 
            constexpr AVPointer(const AVPointer&) noexcept = delete;
 
            constexpr AVPointer(AVPointer&& other) noexcept
            : m_ptr(other.m_ptr) {
                other.m_ptr = nullptr;
            }
 
            virtual ~AVPointer() noexcept = default;
 
            constexpr AVPointer& operator=(const AVPointer&) noexcept = delete;
 
            constexpr AVPointer& operator=(AVPointer&& other) noexcept {
                if (this != &other) {
                    Free();
                    m_ptr = other.m_ptr;
                    other.m_ptr = nullptr;
                }
                return *this;
            }
 
        protected:
            std::decay_t<AVType>* m_ptr = nullptr;  
 
            constexpr const std::decay_t<AVType>* Get() const noexcept {
                return m_ptr;
            }
 
            constexpr std::decay_t<AVType>* Get() noexcept {
                return m_ptr;
            }
 
            constexpr std::decay_t<AVType>* Detach() noexcept {
                auto* ptr = m_ptr;
                m_ptr = nullptr;
                return ptr;
            }
 
            explicit constexpr AVPointer(std::decay_t<AVType>* ptr) noexcept
            : m_ptr(ptr) {}
 
            virtual void Free() noexcept = 0;
    };
}