> Given an output iterator a ...
> X u(a); X x(u); X y(x); X z(y);

Many apologises, when I wrote this I meant:
X u(a); ++u; X x(u); ++x; X y(x); ++y; X z(y); ++z;

Which appears to be legal to me, and I should be able to write to any of
u,x,y,z and in any order.

Chris

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