274ace790b
A sample implementation of how to have `iter()` work on mutable queries without breaking aliasing rules. # Objective - Fixes #753 ## Solution - Added a ReadOnlyFetch to WorldQuery that is the `&T` version of `&mut T` that is used to specify the return type for read only operations like `iter()`. - ~~As the comment suggests specifying the bound doesn't work due to restrictions on defining recursive implementations (like `Or`). However bounds on the functions are fine~~ Never mind I misread how `Or` was constructed, bounds now exist. - Note that the only mutable one has a new `Fetch` for readonly as the `State` has to be the same for any of this to work Co-authored-by: Carter Anderson <mcanders1@gmail.com> |
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| .. | ||
| commands | ||
| exclusive_system.rs | ||
| function_system.rs | ||
| mod.rs | ||
| query.rs | ||
| system_chaining.rs | ||
| system_param.rs | ||
| system.rs | ||