As of this writing (but perhaps not for very much longer!) the four mainstream compilers on Godbolt Compiler Explorer give four different answers for this simple C++ program:
This blog post is going to be a little different to the previous few posts, there will be essentially no mathematics nor code. It is not intended as a how to or instructional post, merely a repository for my current opinions.
In this blog post we will cover some of the basics of the Barnes Hut algorithm. This is completely new to me, it is not an algorithm I’ve used/studied before (and I am by no means an astrophysicist). Nonetheless it has piqued my interest so I have decided to write about it. In this blog I will be talking about 2 dimensions unless otherwise stated, this just makes the resulting code run a little quicker and output easier to visualise. Modifying the 2d code to be 3d (or even higher dimension) requires only minor revisions.
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T. Yoshinaka, S. Ishii, T. Fukuhara, H. Masuda, and H. Nakagawa. Proceedings of the 2008/2009 international conference on Social software: recent trends and developments in social software, page 88--99. Berlin, Heidelberg, Springer-Verlag, (2010)
A. Ebersbach, M. Glaser, and R. Heigl. UTB UVK Verlagsgesellschaft, Konstanz, 2. überarb. edition, (2010)noch nicht erschienen, laut Verlag für Sept 2010 geplant.