#includeIn this example, we define a simple implementation of the "IReader" interface for reading from a null-terminated string. The "read" method copies up to "nbytes" of characters from the string, starting from the current position, into the given buffer. If the end of the string is reached, the method returns -1 to indicate the end of the input. In the "main" function, we create an instance of "StringReader" with the string "Hello, world!\0", and repeatedly read 5 characters at a time from the input until we reach the end. We print the characters as strings to the console. Note that there is no package library specified or required for this example.#include class IReader { public: virtual int read(void* dest, int nbytes) = 0; }; // Example implementation of IReader for string input class StringReader : public IReader { public: StringReader(const char* str) : m_str(str), m_pos(0) {} int read(void* dest, int nbytes) { if (m_pos >= strlen(m_str)) { return -1; // end of string } int n = std::min(static_cast (strlen(m_str) - m_pos), nbytes); memcpy(dest, m_str + m_pos, n); m_pos += n; return n; } private: const char* m_str; int m_pos; }; int main() { StringReader reader("Hello, world!\0"); char buf[20]; while (true) { int n = reader.read(buf, 5); if (n <= 0) break; buf[n] = '\0'; std::cout << buf << std::endl; } return 0; }