RTTI and Reflection for C++
One important and useful feature is missing in C++: Reflection. Reflection is the ability of a language to acquire information about objects at runtime. Of course C++ has a typeid operator, but the use of the returned type_info is very limited and compiler dependant. What one is actually seeking for is complete information not only about class inheritance but also about all members and methods of each class.
Exactly this king of information offers the Reflex library developed at CERN. You can get all kinds of information about every object and class in your system, you can even instanciate new objects at runtime using string-literals describing a class and invoke any method of an object. One special advantage of this package is that it works in an absoultely non-intrusive manner, meaning that you do no have to change a single line of your code in order to get reflection. Instead of changing your code, Reflex relies on the gccxml parser that generates rich XML information about your classes. This information is then automatically transformed into some additional files containing cpp code containing all neccessary dictionaries and bindings to your code to enable full reflection.
Imagine the possibilities of such a system: You can easily integrate a scripting language into your program in a very generic manner if you use the rflection information provided by the Reflex library. WIth some additional work it should also be possible to serialise your objects to disk for providing persistent storage semantics. It even should be possible to implement some remote procedure calls building upon the reflection information provided by Reflex.
Exactly this king of information offers the Reflex library developed at CERN. You can get all kinds of information about every object and class in your system, you can even instanciate new objects at runtime using string-literals describing a class and invoke any method of an object. One special advantage of this package is that it works in an absoultely non-intrusive manner, meaning that you do no have to change a single line of your code in order to get reflection. Instead of changing your code, Reflex relies on the gccxml parser that generates rich XML information about your classes. This information is then automatically transformed into some additional files containing cpp code containing all neccessary dictionaries and bindings to your code to enable full reflection.
Imagine the possibilities of such a system: You can easily integrate a scripting language into your program in a very generic manner if you use the rflection information provided by the Reflex library. WIth some additional work it should also be possible to serialise your objects to disk for providing persistent storage semantics. It even should be possible to implement some remote procedure calls building upon the reflection information provided by Reflex.
In my last entry I was talking about a neat tool generating reflection information for arbitrary C++ programs. Today I found another useful tool that is somewhat related to reflection, namely scripting. There are many scripting languages out there especia
Tracked: Mar 20, 13:52