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[Merged by Bors] - Add 's (state) lifetime to Fetch #2515

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[Merged by Bors] - Add 's (state) lifetime to Fetch #2515

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BoxyUwU
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@BoxyUwU BoxyUwU commented Jul 22, 2021

Allows iterators to return things that borrow data from QueryState, needed this in my relations PR figure might be worth landing separately maybe

@github-actions github-actions bot added S-Needs-Triage This issue needs to be labelled S-Pre-Relicense This PR was made before Bevy added the Apache license. Cannot be merged or used for other work labels Jul 22, 2021
@bjorn3 bjorn3 added A-ECS Entities, components, systems, and events C-Feature A new feature, making something new possible and removed S-Needs-Triage This issue needs to be labelled S-Pre-Relicense This PR was made before Bevy added the Apache license. Cannot be merged or used for other work labels Jul 22, 2021
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DJMcNab commented Jul 22, 2021

Right, I think I now understand these changes (and the similar changes for the render rework)

To be clear, this change is only useful for functions which use direct world access, right? I.e. this has no effect for within systems (since they cannot make any assumptions about how long the system's state lasts).

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BoxyUwU commented Jul 22, 2021 •
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Yea this change is only necessary for when you're working with direct world access as the Query type just uses the same lifetime for both

To be even more clear: nothing in bevy main currently needs this change, only the renderer rework and relations seems to want it afaict

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From render rework : https://github.com/cart/bevy/blob/6604d473b45c01415a19e765e628e793128a7267/crates/bevy_ecs/src/query/fetch.rs#L48

I would be for merging that now, it would remove some changes from the render rework

@cart cart added the S-Pre-Relicense This PR was made before Bevy added the Apache license. Cannot be merged or used for other work label Jul 23, 2021
@mockersf mockersf removed the S-Pre-Relicense This PR was made before Bevy added the Apache license. Cannot be merged or used for other work label Jul 24, 2021
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cart commented Jul 29, 2021

bors r+

bors bot pushed a commit that referenced this pull request Jul 29, 2021
@BoxyUwU
Add 's (state) lifetime to Fetch (#2515)
155068a 
Allows iterators to return things that borrow data from `QueryState`, needed this in my relations PR figure might be worth landing separately maybe
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bors bot commented Jul 29, 2021

Pull request successfully merged into main.

Build succeeded:

@bors bors bot changed the title Add 's (state) lifetime to Fetch [Merged by Bors] - Add 's (state) lifetime to Fetch Jul 29, 2021
@bors bors bot closed this Jul 29, 2021
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@mockersf mockersf mockersf approved these changes

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