simplify std::mem references (#15315)

# Objective
- Fixes #15314

## Solution

- Remove unnecessary usings and simplify references to those functions.

## Testing

CI

Cargo.toml

@@ -10,7 +10,7 @@ keywords = ["game", "engine", "gamedev", "graphics", "bevy"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/bevyengine/bevy"
 documentation = "https://docs.rs/bevy"
-rust-version = "1.79.0"
+rust-version = "1.80.0"
 
 [workspace]
 exclude = [

benches/benches/bevy_ecs/world/commands.rs

@@ -1,5 +1,3 @@
-use std::mem::size_of;
-
 use bevy_ecs::{
     component::Component,
     entity::Entity,

crates/bevy_app/src/app.rs

@@ -1115,7 +1115,7 @@ impl Termination for AppExit {
 
 #[cfg(test)]
 mod tests {
-    use std::{iter, marker::PhantomData, mem::size_of, sync::Mutex};
+    use std::{iter, marker::PhantomData, sync::Mutex};
 
     use bevy_ecs::{
         change_detection::{DetectChanges, ResMut},

crates/bevy_asset/src/io/mod.rs

@@ -26,7 +26,6 @@ use futures_io::{AsyncRead, AsyncSeek, AsyncWrite};
 use futures_lite::{ready, Stream};
 use std::{
     io::SeekFrom,
-    mem::size_of,
     path::{Path, PathBuf},
     pin::Pin,
     sync::Arc,

crates/bevy_ecs/src/entity/mod.rs

@@ -1006,7 +1006,6 @@ impl EntityLocation {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::mem::size_of;
 
     #[test]
     fn entity_niche_optimization() {

crates/bevy_ecs/src/storage/blob_vec.rs

@@ -505,7 +505,7 @@ mod tests {
     use crate::{component::Component, ptr::OwningPtr, world::World};
 
     use super::BlobVec;
-    use std::{alloc::Layout, cell::RefCell, mem::align_of, rc::Rc};
+    use std::{alloc::Layout, cell::RefCell, rc::Rc};
 
     /// # Safety
     ///

crates/bevy_ecs/src/world/mod.rs

@@ -2502,7 +2502,7 @@ impl World {
     ///    total += info.layout().size();
     /// }
     /// println!("Total size: {} bytes", total);
-    /// # assert_eq!(total, std::mem::size_of::<A>() + std::mem::size_of::<B>());
+    /// # assert_eq!(total, size_of::<A>() + size_of::<B>());
     /// ```
     ///
     /// ## Dynamically running closures for resources matching specific `TypeId`s

crates/bevy_pbr/src/meshlet/meshlet_mesh_manager.rs

@@ -13,7 +13,7 @@ use bevy_render::{
     renderer::{RenderDevice, RenderQueue},
 };
 use bevy_utils::HashMap;
-use std::{mem::size_of, ops::Range, sync::Arc};
+use std::{ops::Range, sync::Arc};
 
 /// Manages uploading [`MeshletMesh`] asset data to the GPU.
 #[derive(Resource)]

crates/bevy_pbr/src/meshlet/persistent_buffer_impls.rs

@@ -2,7 +2,7 @@ use super::{
     asset::{Meshlet, MeshletBoundingSpheres},
     persistent_buffer::PersistentGpuBufferable,
 };
-use std::{mem::size_of, sync::Arc};
+use std::sync::Arc;
 
 const MESHLET_VERTEX_SIZE_IN_BYTES: u32 = 48;
 

crates/bevy_pbr/src/meshlet/resource_manager.rs

@@ -21,7 +21,6 @@ use binding_types::*;
 use encase::internal::WriteInto;
 use std::{
     array, iter,
-    mem::size_of,
     sync::{atomic::AtomicBool, Arc},
 };
 

crates/bevy_pbr/src/render/mesh_bindings.rs

@@ -4,7 +4,6 @@ use bevy_math::Mat4;
 use bevy_render::{
     mesh::morph::MAX_MORPH_WEIGHTS, render_resource::*, renderer::RenderDevice, texture::GpuImage,
 };
-use std::mem::size_of;
 
 use crate::render::skin::MAX_JOINTS;
 

crates/bevy_pbr/src/render/morph.rs

@@ -1,4 +1,4 @@
-use std::{iter, mem, mem::size_of};
+use std::{iter, mem};
 
 use bevy_ecs::entity::EntityHashMap;
 use bevy_ecs::prelude::*;

crates/bevy_ptr/src/lib.rs

@@ -603,7 +603,6 @@ trait DebugEnsureAligned {
 impl<T: Sized> DebugEnsureAligned for *mut T {
     #[track_caller]
     fn debug_ensure_aligned(self) -> Self {
-        use core::mem::align_of;
         let align = align_of::<T>();
         // Implementation shamelessly borrowed from the currently unstable
         // ptr.is_aligned_to.

crates/bevy_render/src/mesh/morph.rs

@@ -11,7 +11,7 @@ use bevy_hierarchy::Children;
 use bevy_math::Vec3;
 use bevy_reflect::prelude::*;
 use bytemuck::{Pod, Zeroable};
-use std::{iter, mem::size_of};
+use std::iter;
 use thiserror::Error;
 
 const MAX_TEXTURE_WIDTH: u32 = 2048;

crates/bevy_render/src/render_resource/buffer_vec.rs

@@ -1,4 +1,4 @@
-use std::{iter, marker::PhantomData, mem::size_of};
+use std::{iter, marker::PhantomData};
 
 use crate::{
     render_resource::Buffer,
@@ -123,7 +123,7 @@ impl<T: NoUninit> RawBufferVec<T> {
     }
 
     /// Creates a [`Buffer`] on the [`RenderDevice`] with size
-    /// at least `std::mem::size_of::<T>() * capacity`, unless a such a buffer already exists.
+    /// at least `size_of::<T>() * capacity`, unless a such a buffer already exists.
     ///
     /// If a [`Buffer`] exists, but is too small, references to it will be discarded,
     /// and a new [`Buffer`] will be created. Any previously created [`Buffer`]s
@@ -302,7 +302,7 @@ where
     }
 
     /// Creates a [`Buffer`] on the [`RenderDevice`] with size
-    /// at least `std::mem::size_of::<T>() * capacity`, unless such a buffer already exists.
+    /// at least `size_of::<T>() * capacity`, unless such a buffer already exists.
     ///
     /// If a [`Buffer`] exists, but is too small, references to it will be discarded,
     /// and a new [`Buffer`] will be created. Any previously created [`Buffer`]s

crates/bevy_render/src/view/visibility/mod.rs

@@ -537,7 +537,6 @@ mod test {
     use super::*;
     use bevy_app::prelude::*;
     use bevy_hierarchy::BuildChildren;
-    use std::mem::size_of;
 
     fn visibility_bundle(visibility: Visibility) -> VisibilityBundle {
         VisibilityBundle {

examples/ecs/dynamic.rs

@@ -3,7 +3,7 @@
 //! This example show how you can create components dynamically, spawn entities with those components
 //! as well as query for entities with those components.
 
-use std::{alloc::Layout, io::Write, mem::size_of, ptr::NonNull};
+use std::{alloc::Layout, io::Write, ptr::NonNull};
 
 use bevy::prelude::*;
 use bevy::{

examples/shader/custom_phase_item.rs

@@ -36,7 +36,6 @@ use bevy::{
     },
 };
 use bytemuck::{Pod, Zeroable};
-use std::mem::size_of;
 
 /// A marker component that represents an entity that is to be rendered using
 /// our custom phase item.

examples/shader/gpu_readback.rs

@@ -17,7 +17,6 @@ use bevy::{
     },
 };
 use crossbeam_channel::{Receiver, Sender};
-use std::mem::size_of;
 
 /// This example uses a shader source file from the assets subdirectory
 const SHADER_ASSET_PATH: &str = "shaders/gpu_readback.wgsl";

examples/shader/shader_instancing.rs

@@ -27,7 +27,6 @@ use bevy::{
     },
 };
 use bytemuck::{Pod, Zeroable};
-use std::mem::size_of;
 
 /// This example uses a shader source file from the assets subdirectory
 const SHADER_ASSET_PATH: &str = "shaders/instancing.wgsl";