RTEMS GNU Tools On-Line Library

C++ Extensions

Using and Porting the GNU Compiler Collection (GCC)

Chapter 5: Extensions to the C++ Language

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 Standard Predefined).

Naming Results Giving a name to C++ function return values.

Min and Max C++ Minimum and maximum operators.

Destructors and Goto Goto is safe to use in C++ even when destructors are needed.

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++ Signatures You can specify abstract types to get subtype polymorphism independent from inheritance.

Using and Porting the GNU Compiler Collection (GCC)