# Datastructure for lazy evalulation

**URL:** <https://discourse.julialang.org/t/datastructure-for-lazy-evalulation/48972>\
**Category:** General Usage\
**Tags:** data\_structures, lazy-evaluation\
**Created:** [October 25, 2020, 10:11am UTC](https://discourse.julialang.org/t/datastructure-for-lazy-evalulation/48972 "2020-10-25T10:11:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lobingera](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/lobingera/32/211_2.png) [@lobingera](https://discourse.julialang.org/u/lobingera)\
**Post date:** [October 25, 2020, 10:11am UTC](https://discourse.julialang.org/t/datastructure-for-lazy-evalulation/48972/1 "2020-10-25T10:11:28Z")

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I’m working on some visualization things and i think i need a datastructure to capture relations between ‘objects’ or ‘data’ so that i can track down the minimum set of updates.

So like A depends on B and C and if C or B gets invalidated i can get the information an update on A is needed (and btw: i have something on that, but that involves searching in lists of lists and gets unefficient with a lot of objects). Bonus question: Something that can be serialized/stored to disk would be helpful.