(gcc.info)C++ Extensions


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Extensions to the C++ Language
******************************

   The GNU compiler provides these extensions to the C++ language (and
you can also use most of the C language extensions in your C++
programs).  If you want to write code that checks whether these
features are available, you can test for the GNU compiler the same way
as for C programs: check for a predefined macro `__GNUC__'.  You can
also use `__GNUG__' to test specifically for GNU C++ (Note: Standard
Predefined Macros.).

* Naming Results
Giving a name to C++ function return values.
* Min and Max
C++ Minimum and maximum operators.
* Destructors and Goto
Goto is safe to use in C++ even when destructors are needed.
* C++ Interface
You can use a single C++ header file for both declarations and definitions.

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