Typedef in C++
The declaration that follows the keyword typedef is otherwise usual simple declaration (except that other type specifiers, e.g. static, cannot be used). It may declare one or many identifiers on the same line (e.g. int and a pointer to int), it may declare array and function types, pointers and references, class types, etc. Every identifier introduced in this declaration becomes a typedef-name rather than an object that it would become if the keyword typedef was removed.






