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.
|• Standard Predefined Macros:|
|• Common Predefined Macros:|
|• System-specific Predefined Macros:|
|• C++ Named Operators:|