Re^2: An iterator for (not "iterating") a recursive data structure.

S'fine for small AoAoA..s, but the top level array in my application will contain upto 200 million elements -- circa. 7GB -- duplicating that on a stack would blow my memory.

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Re^3: An iterator for (not "iterating") a recursive data structure. by LanX (Saint) on Jul 13, 2019 at 20:13 UTC
> duplicating that on a stack would blow my memory. It's not duplicating the memory, just caching the current path from root to leave, very similar to my solution here Worst case scenario with a balanced two level "tree" would mean approx `@stack == 2*sqrt(@nodes)` . For 200 million elements that's about 28000 elements. If that's still to many store a lazy iterator in the @stack returning the children of one node (like a function ref or an object or a tied array) and process it in the iterator. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l]

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Re^3: An iterator for (not "iterating") a recursive data structure.
by LanX (Saint) on Jul 13, 2019 at 20:13 UTC

> duplicating that on a stack would blow my memory.

It's not duplicating the memory, just caching the current path from root to leave, very similar to my solution here

Worst case scenario with a balanced two level "tree" would mean approx @stack == 2*sqrt(@nodes) .

For 200 million elements that's about 28000 elements.

If that's still to many store a lazy iterator in the @stack returning the children of one node (like a function ref or an object or a tied array) and process it in the iterator.

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery
FootballPerl is like chess, only without the dice}

[reply]
[d/l]