Complex networks in D

http://braingam.es/2013/07/complex-networks-in-d/

by WalterBright • 13 years ago

36 11 13 years ago

sixbrx• 13 years ago

The "static if (directed) { <code> }" part threw me for a loop. The comment says it's evaluated at compile time to control whether the methods are included. That's pretty neat!

jeremiep• 13 years ago

You can also call pure D functions at compile-time, along with mixins this gives you something close to the power of Lisp macros.

he_the_great2• 13 years ago

D provides some very appetizing features for meta and generic programming. You can get some insight from questions like this: http://stackoverflow.com/questions/7300298/metaprogramming-i...

swah• 13 years ago

It could be cool if Google had just pushed D instead of creating Go...

bsaul• 13 years ago

I told myself a similar thing : why did they create a new language instead of picking that one ?

But then i saw the list of features that D has, and remembered the reason why Rob Pike said he wanted to stop using C++ when he saw the new C++ version : "so they thought C++ needs MORE ?".

qznc2• 13 years ago

Yes, D is not a small and simple language. The goal as stated at DConf was to be "comprehensive". D shall include the right tool for any job in system programming. That necessary includes that the programmer has lots of options.

You can use threads or fibers. You can meta-program with various degrees of freedom (and danger) up to generating arbitrary code strings during compilation. You can use high-level parallelism tools like parallel map and thread pools. You can explicitly use SIMD operation for instruction level parallelism. You can have a garbage collector or you can disable it.

On the other hand, D fixes a few problems of C++ (which mostly come from C source code compatability) like ambiguous syntax for templates (Is ">>" a shift-right token or two closing "parens"?).

he_the_great2• 13 years ago

As bsaul hints at, isn't Google, it is the people behind Go. Google didn't say, let us make a new language. Instead employees ask management if they could work on a language. Given this perspective it is easy to see why supporting D wasn't chosen.

Even so, D is making good progress and has a good community to keep it alive for a long time to come.

shoo• 13 years ago

interesting network representation! after being confused for a little, it just looks like a pair of compressed-row sparse matrices - one matrix for the forward edges, and the other for the reverse edges. which then seems like a pretty sensible thing to do, if you care about directionality.

(e.g. http://web.eecs.utk.edu/~dongarra/etemplates/node373.html) (edit: without the coefficients, of course, unless you want edge weights)

Complex networks in D

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