Re: [math] pow redux and observations

Hello,

> Actually, a rationale could be provided for pow<0>(0) == 1.  But it should be
> explained in the documentation.  Alternatively, you could use a policy class, I
> suppose.  Either way, pow<0> should probably be handled as a special case, not
> in positive_power.

As returning 1 makes sense in most cases, I'd be inclined to simply
state this behavior in the doc.

We can use policies, but in this case I vote for having 2 different
policies for negatives powers of 0 and 0^0, with throw_on_error as a
default for the first one and ignore_error (namely: return 1) for the
second one.

Bruno
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