Node: Predefined Macros, Next: Undefining and Redefining Macros, Previous: Variadic Macros, Up: Macros
Several object-like macros are predefined; you use them without supplying their definitions. They fall into three classes: standard, common, and system-specific.
In C++, there is a fourth category, the named operators. They act like predefined macros, but you cannot undefine them.