for.h

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#pragma once
 
// Need to work out a better way here - do not use instance name, use counter!
#define FOR_INNER(TYPE, INSTANCE, ITER, ITEM, ITER_TYPE, ITER_GET)                                 \
    NS(TYPE, ITER_TYPE) ITER = NS(TYPE, ITER_GET)(INSTANCE);                                       \
    for (NS(NS(TYPE, ITER_TYPE), item) ITEM = NS(NS(TYPE, ITER_TYPE), next)(&ITER);                \
         !NS(NS(TYPE, ITER_TYPE), empty_item)(&ITEM); ITEM = NS(NS(TYPE, ITER_TYPE), next)(&ITER))
 
#define FOR(TYPE, INSTANCE, ITER, ITEM) FOR_INNER(TYPE, INSTANCE, ITER, ITEM, iter, get_iter)
#define FOR_CONST(TYPE, INSTANCE, ITER, ITEM)                                                      \
    FOR_INNER(TYPE, INSTANCE, ITER, ITEM, iter_const, get_iter_const)