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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++ (see Predefined Macros in The GNU C Preprocessor).
| • C++ 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. | |
| • Function Multiversioning: | Declaring multiple function versions. | |
| • Type Traits: | Compiler support for type traits. | |
| • C++ Concepts: | Improved support for generic programming. | |
| • Deprecated Features: | Things will disappear from G++. | |
| • Backwards Compatibility: | Compatibilities with earlier definitions of C++. |
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