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(gcc-300.info)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.).

Min and Max

C++ Minimum and maximum operators.

Volatiles

What constitutes an access to a volatile object.

Restricted Pointers

C99 restricted pointers and references.

Vague Linkage

Where G++ puts inlines, vtables and such.

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.

Bound member functions

You can extract a function pointer to the

method denoted by a `->*' or `.*' expression.

C++ Attributes

Variable, function, and type attributes for C++ only.

Java Exceptions

Tweaking exception handling to work with Java.

Deprecated Features

Things might disappear from g++.

Backwards Compatibility

Compatibilities with earlier definitions of C++.