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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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