Chapter 4

1. Macros are powerful tools if used in the right way. However, the following aspects limit the usage of macros. (1) You cannot debug macros; (2) Macro expansion can lead to strange side effects; (3) Macros have no namespace, so if you have a macro that clashes with a name used elsewhere, you get macro replacements where you didn't want them, and this usually leads to strange error messages; and (4) Macros may affect things you are not aware of. For further details, please go to https://stackoverflow.com/questions/14041453.
2. A class/function template refers to a kind of template used to generate template classes/functions. It's just a template but not a class/function, and hence the compiler does not generate any object code for it. A template class/function is an instance of a class/function template. Since it is a class/function, the corresponding object code...