C++ Extensions

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Extensions to the C++ Language
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   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: (cpp.info)Standard Predefined.).

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.
Template Instantiation: Methods for ensuring that exactly one copy of each needed template instantiation is emitted.
C++ Signatures: You can specify abstract types to get subtype polymorphism independent from inheritance.

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