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On 4/14/20 3:19 PM, Bald Eagle wrote:
> William F Pokorny <ano### [at] anonymous org> wrote:
>
...
>
>> The v.zyx syntax has a name - like twizzling or something - and it's
>> offered in some C++ vector template classes at significant complexity to
>> those
>
> Swizzling - yes that rang a bell, and a search confirmed.
>
> Given the above .gray / .grey capability, I must admit it's a bit surprising
> that .yzx would be more complex than either of those or .hf.
>
>
Suppose up front I'll admit I'm in large part repeating what I've heard
other say or what I've read as to the impacts - I've not played a lot
myself with really complex vector template libraries. But, I believe the
impact statements probably true to a large degree.
Aside: There was a cppcon presentation by some effects guru in the last
few years where he was describing his company's code and C++ experience.
As an aside he mentions/complains at one point the C++ vector template
class they use requires a 64GB machine for their compiles(1).
In isolation, v.yzx is not complicated. It, however, adds to the
combinatorial complexity of any vector template class which support
arbitrary floating point types and on those many methods such as
v.yzx.length(), v.yzx.normalize(), v.zyx * v2.yxz, etc. The behavior of
all the methods and overloads you want to generically work have to be
enumerated by the template class in some way such that it turns into
compilable code.
Bill P.
(1) - And people make fun of M4... ;-) Want to side track yourself some
day, look into all the C++ template assist/creation tools...
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