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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
__GNUC__. You can also use
test specifically for GNU C++ (see section `Standard Predefined Macros' in The C Preprocessor).
6.1 Minimum and Maximum Operators in C++ C++ Minimum and maximum operators. 6.2 When is a Volatile Object Accessed? What constitutes an access to a volatile object. 6.3 Restricting Pointer Aliasing C99 restricted pointers and references. 6.4 Vague Linkage Where G++ puts inlines, vtables and such. 6.5 Declarations and Definitions in One Header You can use a single C++ header file for both declarations and definitions. 6.6 Where's the Template? Methods for ensuring that exactly one copy of each needed template instantiation is emitted. 6.7 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. 6.8 C++-Specific Variable, Function, and Type Attributes Variable, function, and type attributes for C++ only. 6.9 Java Exceptions Tweaking exception handling to work with Java. 6.10 Deprecated Features Things might disappear from g++. 6.11 Backwards Compatibility Compatibilities with earlier definitions of C++.