lst-0003-godb.cpp
//#(execute) c++; compiler:g132; options:-O3 -std=c++23; libs:-
// https://godbolt.org/z/fdh4n5x84
struct Book {
auto getTitle() { return Title{"The C++ Handbook"s}; }
auto getAuthor() { return Author{"Torsten T. Will"s}; }
auto turnPage() { return /* Reference to the next page */ 42; }
auto getPage() { return "current page content"; }
auto getLocation() { return /* Shelf number/Book number */ 73; }
};