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272 commits

Author SHA1 Message Date
Nathan Ward
b07b2f524e implement DetectChanges for NonSendMut (#2326)
# Objective

- The `DetectChanges` trait is used for types that detect change on mutable access (such as `ResMut`, `Mut`, etc...)
- `DetectChanges` was not implemented for `NonSendMut`

## Solution

- implement `NonSendMut` in terms of `DetectChanges`
2021-06-09 19:02:00 +00:00
MinerSebas
63047b2417 Fix bad bounds for NonSend SystemParams (#2325)
# Objective

Currently, you can't call `is_added` or `is_changed` on a `NonSend` SystemParam, unless the Resource is a Component (implements `Send` and `Sync`). 
This defeats the purpose of providing change detection for NonSend Resources.
While fixing this, I also noticed that `NonSend` does not have a bound at all on its struct.

## Solution

Change the bounds of `T` to always be `'static`.
2021-06-09 19:01:59 +00:00
Niklas Eicker
cebb553bff Add a readme to bevy_ecs (#2028)
[RENDERED](https://github.com/NiklasEi/bevy/blob/ecs_readme/crates/bevy_ecs/README.md)

Since I am trying to learn more about Bevy ECS at the moment, I thought this issue is a perfect fit.

This PR adds a readme to the `bevy_ecs` crate containing a minimal running example of stand alone `bevy_ecs`. Unique features like customizable component storage, Resources or change detection are introduced. For each of these features the readme links to an example in a newly created examples directory inside the `bevy_esc` crate.

Resolves #2008 

Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-06-08 01:57:24 +00:00
Nathan Ward
19db1e402b [ecs] implement is_empty for queries (#2271)
## Problem
- The `Query` struct does not provide an easy way to check if it is empty. 
- Specifically, users have to use `.iter().peekable()` or `.iter().next().is_none()` which is not very ergonomic. 
- Fixes: #2270 

## Solution
- Implement an `is_empty` function for queries to more easily check if the query is empty.
2021-06-02 20:50:06 +00:00
Carter Anderson
a20dc36c8c Add new SystemState and rename old SystemState to SystemMeta (#2283)
This enables `SystemParams` to be used outside of function systems. Anything can create and store `SystemState`, which enables efficient "param state cached" access to `SystemParams`.

It adds a `ReadOnlySystemParamFetch` trait, which enables safe `SystemState::get` calls without unique world access.

I renamed the old `SystemState` to `SystemMeta` to enable us to mirror the `QueryState` naming convention (but I'm happy to discuss alternative names if people have other ideas). I initially pitched this as `ParamState`, but given that it needs to include full system metadata, that doesn't feel like a particularly accurate name.

```rust
#[derive(Eq, PartialEq, Debug)]
struct A(usize);

#[derive(Eq, PartialEq, Debug)]
struct B(usize);

let mut world = World::default();
world.insert_resource(A(42));
world.spawn().insert(B(7));

// we get nice lifetime elision when declaring the type on the left hand side
let mut system_state: SystemState<(Res<A>, Query<&B>)> = SystemState::new(&mut world);
let (a, query) = system_state.get(&world);
assert_eq!(*a, A(42), "returned resource matches initial value");
assert_eq!(
    *query.single().unwrap(),
    B(7),
    "returned component matches initial value"
);

// mutable system params require unique world access
let mut system_state: SystemState<(ResMut<A>, Query<&mut B>)> = SystemState::new(&mut world);
let (a, query) = system_state.get_mut(&mut world);

// static lifetimes are required when declaring inside of structs
struct SomeContainer {
  state: SystemState<(Res<'static, A>, Res<'static, B>)>
}

// this can be shortened using type aliases, which will be useful for complex param tuples
type MyParams<'a> = (Res<'a, A>, Res<'a, B>);
struct SomeContainer {
  state: SystemState<MyParams<'static>>
}

// It is the user's responsibility to call SystemState::apply(world) for parameters that queue up work   
let mut system_state: SystemState<(Commands, Query<&B>)> = SystemState::new(&mut world);
{
  let (mut commands, query) = system_state.get(&world);
  commands.insert_resource(3.14);
}
system_state.apply(&mut world);
```

## Future Work

* Actually use SystemState inside FunctionSystem. This would be trivial, but it requires FunctionSystem to wrap SystemState in Option in its current form (which complicates system metadata lookup). I'd prefer to hold off until we adopt something like the later designs linked in #1364, which enable us to contruct Systems using a World reference (and also remove the need for `.system`).
* Consider a "scoped" approach to automatically call SystemState::apply when systems params are no longer being used (either a container type with a Drop impl, or a function that takes a closure for user logic operating on params).
2021-06-02 19:57:38 +00:00
thebluefish
f45dbe5bac Fixes dropping empty BlobVec (#2295)
When dropping the data, we originally only checked the size of an individual item instead of the size of the allocation. However with a capacity of 0, we attempt to deallocate a pointer which was not the result of allocation. That is, an item of `Layout { size_: 8, align_: 8 }` produces an array of `Layout { size_: 0, align_: 8 }` when `capacity = 0`.

Fixes #2294
2021-06-02 19:08:39 +00:00
François
6301b728ea remove commented code and TODO as it's not actually possible (#2289)
Fixing it was tried in #2069 and deemed not possible (https://github.com/bevyengine/bevy/pull/2069#issuecomment-841775844)

Other possibility would be to change the TODO to note the dependency on chalk integration.
2021-06-02 02:30:15 +00:00
Nathan Ward
0b67084e10 [assets] fix Assets being set as 'changed' each frame (#2280)
## Objective
- Fixes: #2275 
- `Assets` were being flagged as 'changed' each frame regardless of if the assets were actually being updated. 

## Solution
- Only have `Assets` change detection be triggered when the collection is actually modified. 
- This includes utilizing `ResMut` further down the stack instead of a `&mut Assets` directly.
2021-06-02 02:30:14 +00:00
Paweł Grabarz
1214ddabb7 drop overwritten component data on double insert (#2227)
Continuing the work on reducing the safety footguns in the code, I've removed one extra `UnsafeCell` in favour of safe `Cell` usage inisde `ComponentTicks`. That change led to discovery of misbehaving component insert logic, where data wasn't properly dropped when overwritten. Apart from that being fixed, some method names were changed to better convey the "initialize new allocation" and "replace existing allocation" semantic.

Depends on #2221, I will rebase this PR after the dependency is merged. For now, review just the last commit.

Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-05-30 20:15:40 +00:00
Nathan Ward
173bb48d78 Refactor ResMut/Mut/ReflectMut to remove duplicated code (#2217)
`ResMut`, `Mut` and `ReflectMut` all share very similar code for change detection.
This PR is a first pass at refactoring these implementation and removing a lot of the duplicated code.

Note, this introduces a new trait `ChangeDetectable`.

Please feel free to comment away and let me know what you think!
2021-05-30 19:29:31 +00:00
Paweł Grabarz
052094757a reduce tricky unsafety and simplify table structure (#2221)
I've noticed that we are overusing interior mutability of the Table data, where in many cases we already own a unique reference to it. That prompted a slight refactor aiming to reduce number of safety constraints that must be manually upheld. Now the majority of those are just about avoiding bound checking, which is relatively easy to prove right.

Another aspect is reducing the complexity of Table struct. Notably, we don't ever use archetypes stored there, so this whole thing goes away. Capacity and grow amount were mostly superficial, as we are already using Vecs inside anyway, so I've got rid of those too. Now the overall table capacity is being driven by the internal entity Vec capacity. This has a side effect of automatically implementing exponential growth pattern for BitVecs reallocations inside Table, which to my measurements slightly improves performance in tests that are heavy on inserts. YMMV, but I hope that those tests were at least remotely correct.
2021-05-24 23:21:19 +00:00
Yoh Deadfall
653c10371e Use bevy_reflect as path in case of no direct references (#1875)
Fixes #1844


Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-05-19 19:03:36 +00:00
Nathan Ward
a42343d847 Optimize Events::extend and impl std::iter::Extend (#2207)
The previous implementation of `Events::extend` iterated through each event and manually `sent` it via `Events:;send`.
However, this could be a minor performance hit since calling `Vec::push` in a loop is not optimal.
This refactors the code to use `Vec::extend`.
2021-05-19 18:41:46 +00:00
Nathan Ward
29bc4e3657 Fix Events::<drain/clear> bug (#2206)
Taken from #2145

On draining and clearing, dangling `EventReaders` would not read into the correct event offset.
2021-05-19 03:41:28 +00:00
Nathan Ward
9eb1aeee48 Expose set_changed() on ResMut and Mut (#2208)
This new api stems from this [discord conversation](https://discord.com/channels/691052431525675048/742569353878437978/844057268172357663).

This exposes a public facing `set_changed` method on `ResMut` and `Mut`.

As a side note: `ResMut` and `Mut` have a lot of duplicated code, I have a PR I may put up later that refactors these commonalities into a trait.

Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-05-18 19:25:58 +00:00
Paweł Grabarz
93cc7219bc small ecs cleanup and remove_bundle drop bugfix (#2172)
- simplified code around archetype generations a little bit, as the special case value is not actually needed
- removed unnecessary UnsafeCell around pointer value that is never updated through shared references
- fixed and added a test for correct drop behaviour when removing sparse components through remove_bundle command
2021-05-18 19:25:57 +00:00
Daniel Burrows
d4ffa3f490 Document what Config is and how to use it. (#2185)
While trying to figure out how to implement a `SystemParam`, I spent a
long time looking for a feature that would do exactly what `Config`
does.  I ignored it at first because all the examples I could find used
`()` and I couldn't see a way to modify it.

This is documented in other places, but `Config` is a logical place to
include some breadcrumbs.  I've added some text that gives a brief
overview of what `Config` is for, and links to the existing docs on
`FunctionSystem::config` for more details.

This would have saved me from embarrassing myself by filing https://github.com/bevyengine/bevy/issues/2178.

Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-05-18 00:10:18 +00:00
Federico Rinaldi
1f0988be87 Improve legibility of RunOnce::run_unsafe param (#2181)
During PR #2046 @cart suggested that the `(): ()` notation is less legible than `_input: ()`. The first notation still managed to slip in though. This PR applies the second writing.
2021-05-18 00:10:17 +00:00
Paweł Grabarz
a81fb7aa7e Add a method iter_combinations on query to iterate over combinations of query results (#1763)
Related to [discussion on discord](https://discord.com/channels/691052431525675048/742569353878437978/824731187724681289)

With const generics, it is now possible to write generic iterator over multiple entities at once.

This enables patterns of query iterations like

```rust
for [e1, e2, e3] in query.iter_combinations() {
   // do something with relation of all three entities
}
```

The compiler is able to infer the correct iterator for given size of array, so either of those work
```rust
for [e1, e2] in query.iter_combinations()  { ... }
for [e1, e2, e3] in query.iter_combinations()  { ... }
```

This feature can be very useful for systems like collision detection.

When you ask for permutations of size K of N entities:
- if K == N, you get one result of all entities
- if K < N, you get all possible subsets of N with size K, without repetition
- if K > N, the result set is empty (no permutation of size K exist)

Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-05-17 23:33:47 +00:00
Andre Popovitch
cb98d31b27 Impl AsRef+AsMut for Res, ResMut, and Mut (#2189)
This can save users from having to type `&*X` all the time at the cost of some complexity in the type signature. For instance, this allows me to accommodate @jakobhellermann's suggestion in #1799 without requiring users to type `&*windows` 99% of the time.
2021-05-17 23:07:19 +00:00
Paweł Grabarz
3cf10e2ef2 prevent memory leak when dropping ParallelSystemContainer (#2176)
`ParallelSystemContainer`'s `system` pointer was extracted from box, but it was never deallocated. This change adds missing drop implementation that cleans up that memory.
2021-05-17 20:01:25 +00:00
bjorn3
1d652941ea Some cleanups (#2170)
The first commit monomorphizes `add_system_inner` which I think was intended to be monomorphized anyway. The second commit moves the type argument of `GraphNode` to an associated type.
2021-05-17 19:06:05 +00:00
Jonas Matser
d1f40148fd Allows a number of clippy lints and fixes 2 (#1999)
Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-05-14 20:37:32 +00:00
Nathan Ward
883abbb27a [bevy_ecs] Cleanup SparseSetIndex impls (#2099)
Problem:
- SparseSetIndex trait implementations had a lot of duplicated code.

Solution:
- Utilize a macro to implement the trait for a generic type.
2021-05-07 00:46:54 +00:00
TheRawMeatball
ce6889b9a8 Implement direct mutable dereferencing (#2100)
This PR adds a way to get the underlying mutable reference for it's full lifetime.

Context:
https://discord.com/channels/691052431525675048/692572690833473578/839255317287796796
2021-05-05 19:35:07 +00:00
bjorn3
3af3334cfe Various cleanups (#2046)
This includes a few safety improvements and a variety of other cleanups. See the individual commits.
2021-05-01 20:07:06 +00:00
forbjok
1e0c950004 Implement Debug for Res and ResMut (#2050)
This commit adds blanket implementations of Debug for Res and ResMut, as discussed in https://github.com/bevyengine/bevy/issues/2048.
2021-05-01 02:32:32 +00:00
TheRawMeatball
dbf519c1d7 Fix unsoundness in Query::for_each_mut (#2045) 2021-04-29 18:12:07 +00:00
CGMossa
86ad5bf420 Adding WorldQuery for WithBundle (#2024)
In response to #2023, here is a draft for a PR. 

Fixes #2023

I've added an example to show how to use `WithBundle`, and also to test it out. 

Right now there is a bug: If a bundle and a query are "the same", then it doesn't filter out
what it needs to filter out. 

Example: 

```
Print component initated from bundle.
[examples/ecs/query_bundle.rs:57] x = Dummy( <========= This should not get printed
    111,
)
[examples/ecs/query_bundle.rs:57] x = Dummy(
    222,
)
Show all components
[examples/ecs/query_bundle.rs:50] x = Dummy(
    111,
)
[examples/ecs/query_bundle.rs:50] x = Dummy(
    222,
)
```

However, it behaves the right way, if I add one more component to the bundle,
so the query and the bundle doesn't look the same:

```
Print component initated from bundle.
[examples/ecs/query_bundle.rs:57] x = Dummy(
    222,
)
Show all components
[examples/ecs/query_bundle.rs:50] x = Dummy(
    111,
)
[examples/ecs/query_bundle.rs:50] x = Dummy(
    222,
)
```

I hope this helps. I'm definitely up for tinkering with this, and adding anything that I'm asked to add
or change. 





Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-04-28 21:03:10 +00:00
deprilula28
cdb9097ed4 Make Command's public? (#2034)
I'm using Bevy ECS in a project of mine and I'd like to do world changes asynchronously. 

The current public API for creating entities, `Commands` , has a lifetime that restricts it from being sent across threads. `CommandQueue` on the other hand is a Vec of commands that can be later ran on a World. 

So far this is all public, but the commands themselves are private API. I know the intented use is with `Commands`, but that's not possible for my use case as I mentioned, and so I simply copied over the code for the commands I need and it works. Obviously, this isn't a nice solution, so I'd like to ask if it's not out of scope to make the commands public?
2021-04-28 20:08:33 +00:00
bjorn3
2fcd8a3fb0 Monomorphize various things (#1914)
Based on #1910

This shrinks breakout from 310k to 293k. Most of the win is in outlining the drop glue of `App`. The other two commits save about 800 bytes total when using two empty systems and two simple resources.

After this PR the full disassembly for

```rust
fn main() {
    App::build().run();
}
```

is about as minimal as it gets, so pretty much all other costs scale linear in the amount of resources, systems, etc.

```asm
0000000000001100 <_ZN4core3ptr54drop_in_place$LT$bevy_app..app_builder..AppBuilder$GT$17h76850422c20653deE>:
    1100:       ff 25 52 21 00 00       jmpq   *0x2152(%rip)        # 3258 <_ZN60_$LT$bevy_app..app..App$u20$as$u20$core..ops..drop..Drop$GT$4drop17h67d177ae549d917bE@Base>
    1106:       cc                      int3   
    1107:       cc                      int3   
    1108:       cc                      int3   
    1109:       cc                      int3   
    110a:       cc                      int3   
    110b:       cc                      int3   
    110c:       cc                      int3   
    110d:       cc                      int3   
    110e:       cc                      int3   
    110f:       cc                      int3   

0000000000001110 <_ZN8breakout4main17h7cbe07b319de1042E>:
    1110:       53                      push   %rbx
    1111:       48 81 ec 00 03 00 00    sub    $0x300,%rsp
    1118:       48 8d 5c 24 08          lea    0x8(%rsp),%rbx
    111d:       48 89 df                mov    %rbx,%rdi
    1120:       ff 15 3a 21 00 00       callq  *0x213a(%rip)        # 3260 <_ZN8bevy_app3app3App5build17h8b0ea6be9050d6ccE@Base>
    1126:       48 89 df                mov    %rbx,%rdi
    1129:       ff 15 39 21 00 00       callq  *0x2139(%rip)        # 3268 <_ZN8bevy_app11app_builder10AppBuilder3run17hfc8cf50692acdbdeE@Base>
    112f:       48 8d 7c 24 08          lea    0x8(%rsp),%rdi
    1134:       ff 15 1e 21 00 00       callq  *0x211e(%rip)        # 3258 <_ZN60_$LT$bevy_app..app..App$u20$as$u20$core..ops..drop..Drop$GT$4drop17h67d177ae549d917bE@Base>
    113a:       48 81 c4 00 03 00 00    add    $0x300,%rsp
    1141:       5b                      pop    %rbx
    1142:       c3                      retq   
    1143:       48 89 c3                mov    %rax,%rbx
    1146:       48 8d 7c 24 08          lea    0x8(%rsp),%rdi
    114b:       e8 b0 ff ff ff          callq  1100 <_ZN4core3ptr54drop_in_place$LT$bevy_app..app_builder..AppBuilder$GT$17h76850422c20653deE>
    1150:       48 89 df                mov    %rbx,%rdi
    1153:       e8 18 01 00 00          callq  1270 <_Unwind_Resume@plt>
    1158:       0f 0b                   ud2    
    115a:       cc                      int3   
    115b:       cc                      int3   
    115c:       cc                      int3   
    115d:       cc                      int3   
    115e:       cc                      int3   
    115f:       cc                      int3   

0000000000001160 <main>:
    1160:       48 83 ec 08             sub    $0x8,%rsp
    1164:       48 89 f1                mov    %rsi,%rcx
    1167:       48 63 d7                movslq %edi,%rdx
    116a:       48 8d 05 9f ff ff ff    lea    -0x61(%rip),%rax        # 1110 <_ZN8breakout4main17h7cbe07b319de1042E>
    1171:       48 89 04 24             mov    %rax,(%rsp)
    1175:       48 8d 35 94 1e 00 00    lea    0x1e94(%rip),%rsi        # 3010 <__init_array_end>
    117c:       48 89 e7                mov    %rsp,%rdi
    117f:       ff 15 eb 20 00 00       callq  *0x20eb(%rip)        # 3270 <_ZN3std2rt19lang_start_internal17he77194431b0ee4a2E@Base>
    1185:       59                      pop    %rcx
    1186:       c3                      retq   
    1187:       cc                      int3   
    1188:       cc                      int3   
    1189:       cc                      int3   
    118a:       cc                      int3   
    118b:       cc                      int3   
    118c:       cc                      int3   
    118d:       cc                      int3   
    118e:       cc                      int3   
    118f:       cc                      int3   

0000000000001190 <_ZN3std2rt10lang_start28_$u7b$$u7b$closure$u7d$$u7d$17h83a5b8d55f23dff8E.llvm.909376793398482062>:
    1190:       48 83 ec 08             sub    $0x8,%rsp
    1194:       48 8b 3f                mov    (%rdi),%rdi
    1197:       e8 54 ff ff ff          callq  10f0 <_ZN3std10sys_common9backtrace28__rust_begin_short_backtrace17h6e238af75680eb28E>
    119c:       31 c0                   xor    %eax,%eax
    119e:       59                      pop    %rcx
    119f:       c3                      retq   

00000000000011a0 <_ZN4core3ops8function6FnOnce40call_once$u7b$$u7b$vtable.shim$u7d$$u7d$17hb05d591cd29dea4fE.llvm.909376793398482062>:
    11a0:       48 83 ec 08             sub    $0x8,%rsp
    11a4:       48 8b 3f                mov    (%rdi),%rdi
    11a7:       e8 44 ff ff ff          callq  10f0 <_ZN3std10sys_common9backtrace28__rust_begin_short_backtrace17h6e238af75680eb28E>
    11ac:       31 c0                   xor    %eax,%eax
    11ae:       59                      pop    %rcx
    11af:       c3                      retq   

00000000000011b0 <_ZN4core3ptr85drop_in_place$LT$std..rt..lang_start$LT$$LP$$RP$$GT$..$u7b$$u7b$closure$u7d$$u7d$$GT$17he9aeeba375093b99E.llvm.909376793398482062>:
    11b0:       c3                      retq   
    11b1:       cc                      int3   
    11b2:       cc                      int3   
    11b3:       cc                      int3   
    11b4:       cc                      int3   
    11b5:       cc                      int3   
    11b6:       cc                      int3   
    11b7:       cc                      int3   
    11b8:       cc                      int3   
    11b9:       cc                      int3   
    11ba:       cc                      int3   
    11bb:       cc                      int3   
    11bc:       cc                      int3   
    11bd:       cc                      int3   
    11be:       cc                      int3   
    11bf:       cc                      int3
```
2021-04-28 19:04:00 +00:00
François
6f7da027c7 Automatic System Spans (#2033)
As mentioned in https://github.com/bevyengine/bevy/issues/2025#issuecomment-827867660, systems used to have spans by default.

* add spans by default for every system executed
* create folder if missing for feature `wgpu_trace`
2021-04-28 18:41:16 +00:00
Lucas Rocha
b1ed28e17e Hide re-exported docs (#1985)
Solves #1957 

Co-authored-by: caelumLaron <caelum.laron@gmail.com>
2021-04-27 18:29:33 +00:00
TehPers
d653ad2bda Updated docs for ShouldRun (#1987)
The documentation for `ShouldRun` doesn't completely explain what each of the variants you can return does. For instance, it isn't very clear that looping systems aren't executed again until after all the systems in a stage have had a chance to run.

This PR adds to the documentation for `ShouldRun`, and hopefully clarifies what is happening during a stage's execution when run criteria are checked and systems are being executed.
2021-04-23 18:38:18 +00:00
TehPers
0a587ac3b5 Updated remaining system panic messages to include the system name (#1986)
Some panic messages for systems include the system name, but there's a few panic messages which do not. This PR adds the system name for the remaining panic messages.

This is a continuation of the work done in #1864.
Related: #1846
2021-04-23 17:54:04 +00:00
Zicklag
6508b4ed25 Hide Derived SystemParam State Struct From Docs (#1984)
This makes sure the automatically generated MyStructState type is not
shown in the rustdoc when deriving SystemParam on MyStruct.
2021-04-22 23:09:59 +00:00
bjorn3
6719c2c390 Extract monomorphic get_insert_bundle_info function (#1910)
This shrinks breakout from 316k to 310k when using `--feature dynamic`.

I haven't run the ecs benchmark to test performance as my laptop is too noisy for reliable benchmarking.
2021-04-22 19:34:34 +00:00
Lukas Wirth
7c274e5a44 Improve bevy_ecs query docs (#1935)
Mainly documents Query, WorldQuery and the various Query Filter types as well as some smaller doc changes.
2021-04-22 19:09:09 +00:00
Carter Anderson
b9640243c6 Separate Query filter access from fetch access during initial evaluation (#1977)
Fixes #1955 

See this comment for implementation details / motivation: https://github.com/bevyengine/bevy/issues/1955#issuecomment-823600886
2021-04-22 02:16:09 +00:00
Alice Cecile
e4e32598a9 Cargo fmt with unstable features (#1903)
Fresh version of #1670 off the latest main.

Mostly fixing documentation wrapping.
2021-04-21 23:19:34 +00:00
MinerSebas
e29a899b90 Added missing Component Bound to Res<> and ResMut<> (#1962)
Fixes #1838
2021-04-19 21:53:34 +00:00
Yoh Deadfall
4f1689ec37 Added example of entity sorting by components (#1817)
We discussed with @alice-i-cecile privately on iterators and agreed that making a custom ordered iterator over query makes no sense since materialization is required anyway and it's better to reuse existing components or code. Therefore, just adding an example to the documentation as requested.

Fixes #1470.

Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2021-04-19 20:28:02 +00:00
François
2bd8ed57d0 par_for_each: split batches when iterating on a sparse query (#1945)
Fixes #1943 

Each batch was iterating over the complete query
2021-04-19 18:41:42 +00:00
MinerSebas
20673dbe0e Doctest improvments (#1937) 2021-04-16 19:13:08 +00:00
Logan Magee
d508923eb7 Allow deriving SystemParam on private types (#1936)
Examples creating a public type to derive `SystemParam` on were updated
to create a private type where a public one is no longer needed.

Resolves #1869
2021-04-16 18:40:49 +00:00
Lukas Wirth
0a6fee5d17 Improve bevy_ecs::system module docs (#1932)
This includes a lot of single line comments where either saying more wasn't helpful or due to me not knowing enough about things yet to be able to go more indepth. Proofreading is very much welcome.
2021-04-15 20:36:16 +00:00
Boxy
9657f58f6a Fix unsoundness in query component access (#1929)
Pretty much does what it says in the title lol
2021-04-15 20:17:59 +00:00
Yoh Deadfall
22314923d9 Angle bracket annotated types to support generics (#1919)
Fixes #1873. Types should be enclosed in angular brackets to avoid ambiquity and to correctly resolve associated functions.
2021-04-15 00:16:40 +00:00
Richard Tjerngren
490a957542 Document Query.single() (#1915) 2021-04-15 00:16:39 +00:00
Daniel McNab
a137df7d57 Fix SytemParam handling of Commands (#1899)
Fixes https://github.com/bevyengine/bevy/issues/1896
2021-04-14 23:58:27 +00:00