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# Objective - Fixes #7659 ## Solution The idea of anonymous system sets or "implicit hidden organizational sets" was briefly mentioned by @cart here: https://github.com/bevyengine/bevy/pull/7634#issuecomment-1428619449. - `Schedule::add_systems` creates an implicit, anonymous system set of all systems in `SystemConfigs`. - All dependencies and conditions from the `SystemConfigs` are now applied to the implicit system set, instead of being applied to each individual system. This should not change the behavior, AFAIU, because `before`, `after`, `run_if` and `ambiguous_with` are transitive properties from a set to its members. - The newly added `AnonymousSystemSet` stores the names of its members to provide better error messages. - The names are stored in a reference counted slice, allowing fast clones of the `AnonymousSystemSet`. - However, only the pointer of the slice is used for hash and equality operations - This ensures that two `AnonymousSystemSet` are not equal, even if they have the same members / member names. - So two identical `add_systems` calls will produce two different `AnonymousSystemSet`s. - Clones of the same `AnonymousSystemSet` will be equal. ## Drawbacks If my assumptions are correct, the observed behavior should stay the same. But the number of system sets in the `Schedule` will increase with each `add_systems` call. If this has negative performance implications, `add_systems` could be changed to only create the implicit system set if necessary / when a run condition was added. --------- Co-authored-by: Carter Anderson <mcanders1@gmail.com> |
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