bit7zlibraryloader.hpp

/*
 * bit7z - A C++ static library to interface with the 7-zip shared libraries.
 * Copyright (c) Riccardo Ostani - All Rights Reserved.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */
 
#ifndef BIT7ZLIBRARYLOADER_HPP
#define BIT7ZLIBRARYLOADER_HPP
 
#include "bit7zlibrary.hpp"
#include "bitdefines.hpp"
#include "bittypes.hpp"
 
#include <system_error>
 
namespace bit7z {

class Bit7zLibraryLoader final {
    public:
        Bit7zLibraryLoader() noexcept;

        explicit Bit7zLibraryLoader( const tstring& libraryPath );
 
        Bit7zLibraryLoader( const Bit7zLibraryLoader& ) = delete;
 
        Bit7zLibraryLoader( Bit7zLibraryLoader&& ) = delete;
 
        auto operator=( const Bit7zLibraryLoader& ) -> Bit7zLibraryLoader& = delete;
 
        auto operator=( Bit7zLibraryLoader&& ) -> Bit7zLibraryLoader& = delete;

        ~Bit7zLibraryLoader();

        void load( const tstring& libraryPath );

        void load( const tstring& libraryPath, std::error_code& ec ) noexcept;

        BIT7Z_NODISCARD
        auto library() const -> const Bit7zLibrary&;

        void unload() noexcept;

        BIT7Z_NODISCARD
        auto isLoaded() const noexcept -> bool;

        BIT7Z_NODISCARD
        auto operator->() const -> const Bit7zLibrary*;

        /* implicit */ operator const Bit7zLibrary&() const; //NOLINT(*-explicit-conversions)
 
    private:
        /* We can't use std::optional here since bit7z's public API is still C++14.
         * Alternatively, we could move the internal's Optional class to the public API, and use it here.
         * Ultimately, I preferred to not pollute the public API with yet another class and
         * simply reimplemented a very bare-bones optional storage. */
        union {
            byte_t mEmpty;
            Bit7zLibrary mLibrary;
        };
 
        bool mLoaded;
};
 
} // namespace bit7z
 
#endif //BIT7ZLIBRARYLOADER_HPP