7 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++ (see Predefined Macros in The GNU C Preprocessor).

7.1 When is a Volatile C++ Object Accessed?		What constitutes an access to a volatile object.
7.2 Restricting Pointer Aliasing		C99 restricted pointers and references.
7.3 Vague Linkage		Where G++ puts inlines, vtables and such.
7.4 #pragma interface and implementation		You can use a single C++ header file for both declarations and definitions.
7.5 Where’s the Template?		Methods for ensuring that exactly one copy of each needed template instantiation is emitted.
7.6 Extracting the function pointer from a bound pointer to member function		You can extract a function pointer to the method denoted by a ‘`->`’ or ‘`.`’ expression.
7.7 C++-Specific Variable, Function, and Type Attributes		Variable, function, and type attributes for C++ only.
7.8 Function Multiversioning		Declaring multiple function versions.
7.9 Namespace Association		Strong using-directives for namespace association.
7.10 Type Traits		Compiler support for type traits
7.11 Java Exceptions		Tweaking exception handling to work with Java.
7.12 Deprecated Features		Things will disappear from G++.
7.13 Backwards Compatibility		Compatibilities with earlier definitions of C++.

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