gcc: C++ Extensions

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1 7 Extensions to the C++ Language
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1 The GNU compiler provides these extensions to the C++ language (and you
1 can also use most of the C language extensions in your C++ programs).
1 If you want to write code that checks whether these features are
1 available, you can test for the GNU compiler the same way as for C
1 programs: check for a predefined macro '__GNUC__'.  You can also use
11 '__GNUG__' to test specifically for GNU C++ (⇒Predefined Macros
 (cpp)Common Predefined Macros.).
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Menu

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· 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
1                         declarations and definitions.
· Template Instantiation Methods for ensuring that exactly one copy of
1                         each needed template instantiation is emitted.
· Bound member functions You can extract a function pointer to the
1                         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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