Follow-up Comment #3, patch #3043 (project freeciv):
I asked:
> Could we add the usual iterator pattern to specenums?
On a moment's more thought: we can't define "trait_iterate(t) { ... }"
because that would involve a #define parameterised by a #define. The best we
can easily do would be "SPECENUM_ITERATE(trait, t) { ... }" which might be
sufficiently more ugly as to not be worth it (compared to the explicit for
loop).
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