[Numpy-discussion] Proposed Roadmap Overview
Mon Feb 20 11:30:04 CST 2012
2012/2/19 Sturla Molden <email@example.com>
> Den 19.02.2012 10:28, skrev Mark Wiebe:
> > Particular styles of using templates can cause this, yes. To properly
> > do this kind of advanced C++ library work, it's important to think
> > about the big-O notation behavior of your template instantiations, not
> > just the big-O notation of run-time. C++ templates have a
> > turing-complete language (which is said to be quite similar to
> > haskell, but spelled vastly different) running at compile time in
> > them. This is what gives template meta-programming in C++ great power,
> > but since templates weren't designed for this style of programming
> > originally, template meta-programming is not very easy.
> The problem with metaprogramming is that we are doing manually the work
> that belongs to the compiler. Blitz++ was supposed to be a library that
> "thought like a compiler". But then compilers just got better. Today, it
> is no longer possible for a numerical library programmer to outsmart an
> optimizing C++ compiler. All metaprogramming can do today is produce
> error messages noone can understand. And the resulting code will often
> be slower because the compiler has less opportunities to do its work.
As I've said, the compiler is pretty much stupid. It cannot do what
Blitzz++ did, or what Eigen is currently doing, mainly because of the basis
different languages (C or C++).
Information System Engineer, Ph.D.
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