Cromwell Enage <sponage@yahoo.com> writes:
Hi, all!
I spent a bit of time reading Pete Isenesee's article, "Fast Math Using Template Metaprogramming", which can be found in Game Programming Gems, Section 1.2, and it inspired me to implement compile-time versions of some of the standard math functions. Two of the metafunctions even work for complex numbers, using the components as input instead of any particular complex number class. My work so far can be found here:
<http://groups.yahoo.com/group/boost/files/mpl_math.zip>
Yes, it also provides the math constant PI. Perhaps a constants library can be built on top of this one?
I'm holding off on putting this mini-library in the Sandbox until the file hierarchy is reasonably stable; I'm not even sure if the classes are well-structured at this point. For this reason, I'm also holding off on writing documentation; I'm hoping the example program would be simple enough to understand.
Please send feedback!
Did you compile it? If so, on what compilers? I can't see how it could possibly work. #include <boost/config.hpp> template <typename RealNum> struct sample_t { BOOST_STATIC_CONSTANT(RealNum, base = 5.0); BOOST_STATIC_CONSTANT(RealNum, power = 1.0); BOOST_STATIC_CONSTANT(RealNum, angle = 1.234); }; is an illegal program (try comeau online to see some reasons why). Also, it's not very mpl-ish. Nothing seems to follow the metafunction protocol of operating on and returning types. I hate to be discouraging; it's probably a really interesting idea. I am only looking as far as some details of the implementation, here. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com