I read many article about how to implement multimethod in c++:
- http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1529.html
- http://www.codeproject.com/KB/recipes/mmcppfcs.aspx
- http://lambda-the-ultimate.org/node/2590
- http://parasol.tamu.edu/people/peterp/omm/
why there are no multimethod in c++?
why do not they get supported by c++ standard?
Straight from the horse's mouth:
Bjarne Stroustrup, The Design and Evolution of C++ (p297)
And later:
(p298f)
In general, whenever you feel the urge to know why some particular C++ feature was implemented, or was not implemented, or was implemented the way it is now, and if that feature pre-dates the standardization, you want to read D&E.
Just because it could be done doesn't mean it's a problem that it wasn't done. One criticism of C++ is along the lines of "Stroustrup took everything anyone had heard of, and tried to include it."
Plus, as Raymond Chen says, "Every feature starts off with -100 points." That is, before you ask why C++ doesn't have these things, you should explain in detail why it needs them. Otherwise your feature stays in negative territory, due to the costs associated with it.
As Bjarne has pointed out a number of times, when people criticize C++, it usually runs something like: "C++ is too big, too complex, has too many features, and it's too hard to learn -- you should really work at making it smaller and simpler. Oh, and while you're working on that I also have this really great idea for a killer feature that you should add!"