Lorenzo,

While your thinking about additional layers, consider the other
layers discussed here:

        http://www.openss7.org/docs/NOTES.pdf

namely,

        dielectric layers
        resistance layers
        plating layers
        hole filling layers
        keep-out layers
        via plugging layers
        contacts layers
        peelable mask layers
        finish layers
        heat sink layers
        coating layers
        probe layers
        fixture layers

that's another 26 (or more) layers.  Still think 64 will be
enough?

Check section 2.6 (Layers) on page 13 for definitions of these
layers.

BTW, long long is part of the C standard and excluded from the C++
standard.  Good luck with Windows (it doesn't support it in C++).

The best approach is to make the layer a full class and only use
accessor functions, or overload the bitwise logical and arithmetic
operators.  I did that, but nobody was interested at the time.

--brian

-- 
Brian F. G. Bidulock    � The reasonable man adapts himself to the �
[email protected]    � world; the unreasonable one persists in  �
http://www.openss7.org/ � trying  to adapt the  world  to himself. �
                        � Therefore  all  progress  depends on the �
                        � unreasonable man. -- George Bernard Shaw �

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