cppFollyIOBufDemo

   const size_t bufSize{ 20 };
    char* text{ new char[bufSize] };
    memcpy (text, "Hello,World! :)\n", bufSize);
    //auto storage{ folly::IOBuf::create (bufSize) };
    //auto storage{ folly::IOBuf::wrapBuffer(text, bufSize) };
    std::unique_ptr<folly::IOBuf>* storage{ new std::unique_ptr<folly::IOBuf>};
    *storage = folly::IOBuf::takeOwnership (text, bufSize, [](void* ptr, void* ud) { std::cout << "Free owned buffer!\n"; delete[] static_cast<char*>(ptr);  });

    //storage->append (bufSize);
    //memcpy (storage->writableData(), "Hello,World! :)\n", bufSize);
    std::cout << (*storage)->length () << ' ' << (*storage)->capacity () << '\n';
    std::cout << "isShared: " << std::boolalpha << (*storage)->isShared () << '\n';
    std::cout << "storage->buffer(): " << reinterpret_cast<const void*>((*storage)->writableData ()) << '\n';
    {
        auto data{ (*storage)->clone () };
        std::cout << data->length () << ' ' << data->capacity () << '\n';
        //data->append (bufSize);
        //std::cout << data->length () << ' ' << data->capacity () << '\n';
        std::cout << "isShared: " << std::boolalpha << data->isShared () << '\n';
        std::cout << "data->buffer(): " << reinterpret_cast<const void*>(data->buffer ()) << '\n';
        std::cout << "data->writableData(): " << reinterpret_cast<const void*>(data->writableData ()) << '\n';
        // MODIFY
        //data->unshare ();
        data->trimStart (2);
        std::cout << "data->buffer(): " << reinterpret_cast<const void*>(data->buffer ()) << '\n';
        std::cout << "data->writableData(): " << reinterpret_cast<const void*>(data->writableData ()) << '\n';
        *(data->writableData()) = 'Z';

        //std::cout << "isShared: " << std::boolalpha << data->isShared () << '\n';
        //auto begin{ data->writableData () };
        //auto end{ begin + data->length () };

        delete storage;

        //memcpy (begin, "Hello,World! :)\n", bufSize);
        std::cout << data->data () << '\n';
    }
    //std::cout << "isShared: " << std::boolalpha << (*storage)->isShared () << '\n';
    //std::cout << (*storage)->data () << '\n';

    //for (uint16_t i{ 0 }; begin < end; *(begin++) = static_cast<uint8_t>(i), ++i);



    return 0;