class ByteArray { public: ByteArray() { m_data = nullptr; m_size = 0; } ByteArray(size_t size) { m_data = new char[size]; m_size = size; } ~ByteArray() { if (m_data) { delete [] m_data; } } char& operator[](size_t index) { return m_data[index]; } void resize(size_t size) { if (size != m_size) { if (m_data) { delete [] m_data; } m_data = new char[size]; m_size = size; } } private: char* m_data; size_t m_size; };In this example, the `ByteArray` class is implemented using a dynamically allocated array of characters (`char*`). It provides functionality for resizing the array, accessing individual elements using the array subscript operator (`[]`), and releasing the memory used by the array when the object is destroyed. The package library for this class is not specified in the code example, but it could be part of a larger library of data structures and algorithms, or it could be implemented as a standalone header file in a C++ project. Some popular C++ libraries for working with data arrays and byte streams include Boost, Qt, and the STL.