Contents|Index|Previous|Next Extensions to the C++ language  The GNU compiler provides 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 Standard predefined macros in The C Preprocessor within GNUPro Compiler Tools). See the following documentation for more specific discussion regarding extensions to the C++ language family. Named return values in C++ Minimum and maximum operators in C++ goto and destructors in GNU C++ Declarations and definitions in one header Where's the template? Type abstraction using signatures