Benoit Jacob b8900d0b80 More clever evaluation of arguments: now it occurs in earlier, in operator*,
before the Product<> type is constructed. This resets template depth on each
intermediate evaluation, and gives simpler code. Introducing
ei_eval_if_expensive<Derived, n> which evaluates Derived if it's worth it
given that each of its coeffs will be accessed n times. Operator*
uses this with adequate values of n to evaluate args exactly when needed.
2008-04-03 14:17:56 +00:00
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