AspectC++

From Wikipedia, the free encyclopedia
Jump to: navigation, search
AspectC++ Compiler
Developer(s) Olaf Spinczyk (project leader), Georg Blaschke, Christoph Borchert, Daniel Lohmann, Rainer Sand, Horst Schirmeier, Ute Spinczyk, Matthias Urban [1]
Initial release November 6, 2001; 12 years ago (2001-11-06) [2]
Stable release 1.2 / 4 October 2013; 12 months ago (2013-10-04)
Written in C++
Operating system Cross-platform
Type Source-to-source Compiler
License GPL 2+
Website www.aspectc.org

AspectC++ is an aspect-oriented extension of C and C++ languages. It has a source-to-source compiler, which translates AspectC++ source code into compilable C++. The compiler is available under the GNU GPL, though some extensions specific to Microsoft Windows are only available through pure-systems GmbH.

Aspect-oriented programming allows modularizing cross-cutting concerns in a single module, an aspect. Aspects can modify existing classes, but most commonly they provide 'advice' that runs before, after, or around existing functionality.

Example[edit]

All calls to a specific function can be traced using an aspect, rather than inserting 'cerr' or print statements in many places:

aspect Tracer
{ 
   advice call("% %Iter::Reset(...)") : before()
   {
      cerr << "about to call Iter::Reset for " << JoinPoint::signature() << endl;
   }
};

The Tracer aspect will print out a message before any call to %Iter::Reset. The %Iter syntax means that it will match all classes that end in Iter.

Each 'matched' location in the source code is called a join point—the advice is joined to (or advises) that code. AspectC++ provides a join point API to provide and access to information about the join point. For example, the function:

JoinPoint::signature()

returns the name of the function (that matched %Iter::Reset) that is about to be called.

The join point API also provides compile-time type information that can be used within an aspect to access the type or the value of the arguments and the return type and return value of a method or function.

External links[edit]

References[edit]