bevy/examples/tools
Carter Anderson b73811d40e
Remove ChildOf::get and Deref impl (#18080)
# Objective

There are currently three ways to access the parent stored on a ChildOf
relationship:

1. `child_of.parent` (field accessor)
2. `child_of.get()` (get function)
3. `**child_of` (Deref impl)

I will assert that we should only have one (the field accessor), and
that the existence of the other implementations causes confusion and
legibility issues. The deref approach is heinous, and `child_of.get()`
is significantly less clear than `child_of.parent`.

## Solution

Remove `impl Deref for ChildOf` and `ChildOf::get`.

The one "downside" I'm seeing is that:

```rust
entity.get::<ChildOf>().map(ChildOf::get)
```
Becomes this:

```rust
entity.get::<ChildOf>().map(|c| c.parent)
```

I strongly believe that this is worth the increased clarity and
consistency. I'm also not really a huge fan of the "pass function
pointer to map" syntax. I think most people don't think this way about
maps. They think in terms of a function that takes the item in the
Option and returns the result of some action on it.

## Migration Guide

```rust
// Before
**child_of
// After
child_of.parent

// Before
child_of.get()
// After
child_of.parent

// Before
entity.get::<ChildOf>().map(ChildOf::get)
// After
entity.get::<ChildOf>().map(|c| c.parent)
```
2025-02-27 23:11:03 +00:00
..
scene_viewer Remove ChildOf::get and Deref impl (#18080) 2025-02-27 23:11:03 +00:00
gamepad_viewer.rs Revert most of #16222 and add gamepad accessors (#16425) 2024-11-19 00:00:16 +00:00