/* Code for exercise 11.8. |  | "C++ Solutions--Companion to The C++ Programming Language, Third Edition" | by David Vandevoorde; Addison-Wesley 1998; ISBN 0-201-30965-3. | | Permission to use, copy, modify, distribute and sell this software | and its documentation for any purpose is hereby granted without fee. | The author makes no representations about the suitability of this | software for any purpose.  It is provided "as is" without express or | implied warranty. `----------------------------------------------------------------------*/#include "str.hpp"#include <stdio.h>inline String String::operator()(int left, int right) {   check(left); check(right);   if (left<=right) {      char *a = new char[right-left+2];      std::strncpy(a, rep->s+left, right-left+1);      a[right-left+1] = '\0';      String result(a);      delete[] a;      return result;   } else { // return an "empty string"      return String();   }}// Steal this from ex11_10.cpp:inline char const* String::c_string() const {   return rep->s;}int main() {   String s("Hello, World!");   printf("%s\n", s(3, 8).c_string());   return 0;}