Malloc Best Effort

https://docs.rs/malloc-best-effort/0.1.4
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Malloc Best Effort is a Rust memory allocator that selects a suitable allocator depending on the...
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### BEMalloc::init

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Starts the allocator's background job. This function should be called within the `main()` function to ensure the allocator is properly initialized.

```APIDOC
## BEMalloc::init

### Description
Starts an allocator background job. Should be called in `main()` function.

### Method
`init()`

### Usage
This method should be invoked in the `main` function of your application.
```

--------------------------------

### BEMalloc::init

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Starts the background job for the BEMalloc allocator. This should be called within the `main()` function of your application.

```APIDOC
## BEMalloc::init

### Description
Starts an allocator background job. This function should be called in the `main()` function.

### Method
`init()`

### Usage
```rust
fn main() {
    BEMalloc::init();
    // ... rest of your application
}
```
```

--------------------------------

### BEMalloc Build Script Configuration

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=std%3A%3Avec

This example shows how to configure your `build.rs` file to handle potential build dependencies and linking requirements for BEMalloc, particularly for mimalloc on different platforms.

```APIDOC
## Build Script Configuration

### Description
This snippet provides guidance for your `build.rs` file to work around mimalloc build dependencies and ensure correct linking on various platforms.

### Usage
Add the following to your `build.rs`:

```rust,ignore
use std::borrow::Cow;
use std::env;

fn main() {
    let target_os = env::var("CARGO_CFG_TARGET_OS").expect("target_os not defined!");
    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("target_arch not defined!"); // on armv6 we need to link with libatomic

    if target_os == "linux" && target_arch == "arm" {
        // Embrace the atomic capability library across various platforms.
        // For instance, on certain platforms, llvm has relocated the atomic of the arm32 architecture to libclang_rt.builtins.a
        // while some use libatomic.a, and others use libatomic_ops.a.
        let atomic_name = match env::var("DEP_ATOMIC") {
            Ok(atomic_name) => Cow::Owned(atomic_name),
            Err(_) => Cow::Borrowed("atomic"),
        };
        println!("cargo:rustc-link-lib={atomic_name}");
    }

    // Link with libs needed on Windows
    if target_os == "windows" {
        // https://github.com/microsoft/mimalloc/blob/af21001f7a65eafb8fb16460b018ebf9d75e2ad8/CMakeLists.txt#L487

        for lib in ["psapi", "shell32", "user32", "advapi32", "bcrypt"] {
            println!("cargo:rustc-link-lib={lib}");
        }
    }
}
```
```

--------------------------------

### Initialize BEMalloc Background Job

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Starts the background job for the BEMalloc allocator. This function should be called within the main function of your program.

```rust
pub fn init()
```

--------------------------------

### Global Allocator Setup

Source: https://docs.rs/malloc-best-effort/0.1.4/index.html

Integrate the BEMalloc allocator as the global allocator in your Rust project by placing this code in `src/main.rs`. Ensure `BEMalloc::init()` is called.

```rust
use malloc_best_effort::BEMalloc;

#[global_allocator]
static GLOBAL: BEMalloc = BEMalloc::new();

fn main() {
    BEMalloc::init();

    // Rest of main
}
```

--------------------------------

### BEMalloc Usage Example

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=std%3A%3Avec

This snippet demonstrates how to integrate BEMalloc as the global allocator in your Rust project's `src/main.rs` file. It also shows the necessary initialization step.

```APIDOC
## BEMalloc Usage

### Description
This section shows how to use `BEMalloc` as the global allocator in your Rust application.

### Usage
Add the following to your `src/main.rs`:

```rust,ignore
use malloc_best_effort::BEMalloc;

#[global_allocator]
static GLOBAL: BEMalloc = BEMalloc::new();

fn main() {
    BEMalloc::init();

    // Rest of main
}
```

### Initialization
Ensure `BEMalloc::init()` is called within your `main` function.
```

--------------------------------

### Get Type ID with Any Trait

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Retrieves the `TypeId` of the current instance. This is part of the blanket implementation of the `Any` trait.

```rust
fn type_id(&self) -> TypeId
```

--------------------------------

### BEMalloc Methods

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=std%3A%3Avec

Provides details on how to create and initialize a BEMalloc allocator instance.

```APIDOC
## pub const fn new() -> Self

### Description
Creates a new instance of the BEMalloc allocator.

### Returns
A new `BEMalloc` instance.

## pub fn init()

### Description
Starts the allocator's background job. This function should be called within the `main()` function.

### Usage
Call this function early in your program's execution, typically at the beginning of `main()`.
```

--------------------------------

### Build Script Configuration for Allocator Dependencies

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

This build script snippet configures linker flags for specific target OS and architectures, particularly for Linux ARM and Windows. It handles linking with atomic libraries and Windows-specific libraries required by mimalloc.

```rust
use std::borrow::Cow;
use std::env;

fn main() {
    let target_os = env::var("CARGO_CFG_TARGET_OS").expect("target_os not defined!");
    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("target_arch not defined!"); // on armv6 we need to link with libatomic

    if target_os == "linux" && target_arch == "arm" {
        // Embrace the atomic capability library across various platforms.
        // For instance, on certain platforms, llvm has relocated the atomic of the arm32 architecture to libclang_rt.builtins.a
        // while some use libatomic.a, and others use libatomic_ops.a.
        let atomic_name = match env::var("DEP_ATOMIC") {
            Ok(atomic_name) => Cow::Owned(atomic_name),
            Err(_) => Cow::Borrowed("atomic"),
        };
        println!("cargo:rustc-link-lib={atomic_name}");
    }

    // Link with libs needed on Windows
    if target_os == "windows" {
        // https://github.com/microsoft/mimalloc/blob/af21001f7a65eafb8fb16460b018ebf9d75e2ad8/CMakeLists.txt#L487

        for lib in ["psapi", "shell32", "user32", "advapi32", "bcrypt"] {
            println!("cargo:rustc-link-lib={lib}");
        }
    }
}

```

--------------------------------

### Initialize Allocator

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Initializes the allocator background job. This should be called in the main function.

```rust
pub fn init() {
    init_impl();
}
```

--------------------------------

### Initialize Allocator

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=

Initializes the allocator. This function should be called in the main function.

```rust
pub fn init() {
        init_impl();
    }
```

--------------------------------

### BEMalloc::new

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Creates a new instance of the BEMalloc allocator. This is the constructor for the allocator.

```APIDOC
## BEMalloc::new

### Description
Creates a new instance of the allocator.

### Method
`new()`

### Returns
- `Self`: A new instance of `BEMalloc`.
```

--------------------------------

### BEMalloc::new

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Creates a new, independent instance of the BEMalloc allocator.

```APIDOC
## BEMalloc::new

### Description
Creates a new instance of the BEMalloc allocator.

### Method
`new()`

### Returns
- `Self`: A new instance of `BEMalloc`.
```

--------------------------------

### Workaround for mimalloc Build Dependencies

Source: https://docs.rs/malloc-best-effort/0.1.4/index.html

Use this code in `build.rs` to manage build dependencies for mimalloc, particularly for ARM architectures on Linux and linking necessary libraries on Windows.

```rust
use std::borrow::Cow;
use std::env;

fn main() {
    let target_os = env::var("CARGO_CFG_TARGET_OS").expect("target_os not defined!");
    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("target_arch not defined!"); // on armv6 we need to link with libatomic

    if target_os == "linux" && target_arch == "arm" {
        // Embrace the atomic capability library across various platforms.
        // For instance, on certain platforms, llvm has relocated the atomic of the arm32 architecture to libclang_rt.builtins.a
        // while some use libatomic.a, and others use libatomic_ops.a.
        let atomic_name = match env::var("DEP_ATOMIC") {
            Ok(atomic_name) => Cow::Owned(atomic_name),
            Err(_) => Cow::Borrowed("atomic"),
        };
        println!("cargo:rustc-link-lib={atomic_name}");
    }

    // Link with libs needed on Windows
    if target_os == "windows" {
        // https://github.com/microsoft/mimalloc/blob/af21001f7a65eafb8fb16460b018ebf9d75e2ad8/CMakeLists.txt#L487

        for lib in ["psapi", "shell32", "user32", "advapi32", "bcrypt"] {
            println!("cargo:rustc-link-lib={lib}");
        }
    }
}
```

--------------------------------

### BEMalloc GlobalAlloc Implementation

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=std%3A%3Avec

This section details the implementation of the `GlobalAlloc` trait for `BEMalloc`, showing how it delegates allocation, deallocation, zeroed allocation, and reallocation calls to its underlying allocator implementation.

```APIDOC
## GlobalAlloc Implementation for BEMalloc

### Description
This documentation covers the `GlobalAlloc` trait implementation for the `BEMalloc` struct. It outlines the methods for memory allocation and deallocation.

### Trait
`unsafe impl GlobalAlloc for BEMalloc`

### Methods

- **`alloc(&self, layout: Layout) -> *mut u8`**
  Allocates memory for a given layout.

- **`dealloc(&self, ptr: *mut u8, layout: Layout)`**
  Deallocates memory at the given pointer with the specified layout.

- **`alloc_zeroed(&self, layout: Layout) -> *mut u8`**
  Allocates memory and initializes it to zero.

- **`realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8`**
  Reallocates memory block to a new size.
```

--------------------------------

### BEMalloc Implementation for Linux x86_64/aarch64 Little-Endian

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

This module defines the `BEMallocImpl` using `tcmalloc_better` and provides an `init_impl` function that calls `process_background_actions_thread` when the `std` feature is enabled. Otherwise, `init_impl` does nothing.

```rust
mod tcmalloc {
    pub(crate) use tcmalloc_better::TCMalloc as BEMallocImpl;

    #[cfg(feature = "std")]
    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
    #[inline]
    pub(crate) fn init_impl() {
        BEMallocImpl::process_background_actions_thread();
    }

    #[cfg(not(feature = "std"))]
    #[cfg_attr(docsrs, doc(cfg(not(feature = "std"))))]
    #[inline]
    pub(crate) fn init_impl() {}
}

```

--------------------------------

### Test: Free Allocated Memory with Init

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Verifies memory deallocation after the allocator has been initialized.

```rust
unsafe {
            let layout = Layout::from_size_align(8, 8).unwrap();
            let alloc = BEMalloc::new();
            BEMalloc::init();

            let ptr = alloc.alloc(layout);
            alloc.dealloc(ptr, layout);
        }
```

--------------------------------

### BEMalloc Default Implementation (Mimalloc)

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Uses `mimalloc` as the default allocator implementation when not targeting specific Linux configurations. This implementation does not require explicit initialization.

```rust
pub(crate) use mimalloc::MiMalloc as BEMallocImpl;

#[inline]
pub(crate) fn init_impl() {}

```

--------------------------------

### BEMalloc Implementation for Non-Linux x86_64/aarch64 Little-Endian

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

This module defines the `BEMallocImpl` using `mimalloc` and provides an `init_impl` function for targets not matching the specific Linux configuration. This is used when the `std` feature is not enabled.

```rust
mod mimalloc {
    pub(crate) use mimalloc::MiMalloc as BEMallocImpl;

    #[inline]
    pub(crate) fn init_impl() {}
}

```

--------------------------------

### GlobalAlloc Trait Implementation

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=std%3A%3Avec

Details the core memory allocation and deallocation functions provided by the GlobalAlloc trait.

```APIDOC
## unsafe fn alloc(&self, layout: Layout) -> *mut u8

### Description
Allocates a block of memory according to the specified `layout`.

### Parameters
* `layout` (Layout) - Describes the size and alignment requirements for the memory block.

### Returns
A raw pointer (`*mut u8`) to the beginning of the allocated memory block.

## unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout)

### Description
Deallocates a previously allocated block of memory.

### Parameters
* `ptr` (*mut u8) - A pointer to the beginning of the memory block to deallocate.
* `layout` (Layout) - The layout that was used when the memory block was allocated.

## unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8

### Description
Allocates a block of memory as described by `layout`, ensuring that the memory contents are initialized to zero.

### Parameters
* `layout` (Layout) - Describes the size and alignment requirements for the memory block.

### Returns
A raw pointer (`*mut u8`) to the beginning of the allocated and zeroed memory block.

## unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8

### Description
Shrinks or grows an existing memory block to a new size.

### Parameters
* `ptr` (*mut u8) - A pointer to the beginning of the memory block to reallocate.
* `layout` (Layout) - The layout of the original memory block.
* `new_size` (usize) - The desired new size of the memory block in bytes.

### Returns
A raw pointer (`*mut u8`) to the beginning of the reallocated memory block. This may be the same as `ptr` or a new location.
```

--------------------------------

### Allocate Zeroed Memory with BEMalloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Allocates memory and ensures its contents are initialized to zero. Behaves like `alloc` but with zero-initialization.

```rust
unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8
```

--------------------------------

### BEMalloc Implementation for Linux x86_64/aarch64 Little Endian

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Uses `tcmalloc_better` as the allocator implementation for specific Linux configurations. Includes conditional initialization logic.

```rust
pub(crate) use tcmalloc_better::TCMalloc as BEMallocImpl;

#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
#[inline]
pub(crate) fn init_impl() {
    BEMallocImpl::process_background_actions_thread();
}

#[cfg(not(feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(not(feature = "std"))))]
#[inline]
pub(crate) fn init_impl() {}

```

--------------------------------

### BEMalloc Structure and GlobalAlloc Implementation

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Details the `BEMalloc` struct, its implementation of the `GlobalAlloc` trait, and its `Default` trait.

```APIDOC
## BEMalloc

### Description
`BEMalloc` is a struct designed to be registered as the global memory allocator. It wraps an underlying allocator implementation (`BEMallocImpl`) that is chosen based on the target platform.

### Struct Definition
```rust
pub struct BEMalloc {
    alloc_impl: BEMallocImpl,
}
```

### GlobalAlloc Implementation
`BEMalloc` implements the `GlobalAlloc` trait, providing the standard methods for memory allocation and deallocation:

- `alloc(&self, layout: Layout) -> *mut u8`
- `dealloc(&self, ptr: *mut u8, layout: Layout)`
- `alloc_zeroed(&self, layout: Layout) -> *mut u8`
- `realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8`

These methods delegate to the underlying `alloc_impl`.

### Default Implementation
`BEMalloc` also implements the `Default` trait, allowing it to be created using `BEMalloc::default()`, which is equivalent to `BEMalloc::new()`.

### Constructor
- `pub const fn new() -> Self`: Creates a new instance of the `BEMalloc` allocator.
```

--------------------------------

### GlobalAlloc::alloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html

Allocates a block of memory according to the specified layout. This is an unsafe function required by the GlobalAlloc trait.

```APIDOC
## GlobalAlloc::alloc

### Description
Allocates memory as described by the given `layout`.

### Safety
This is an `unsafe` function. The caller must ensure that the layout is valid and that memory is managed correctly.

### Parameters
- `layout` (`Layout`): Describes the size and alignment of the memory to be allocated.

### Returns
- `*mut u8`: A raw pointer to the beginning of the allocated memory block.
```

--------------------------------

### GlobalAlloc::alloc_zeroed

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html

Allocates a block of memory and ensures its contents are initialized to zero. This is an unsafe function required by the GlobalAlloc trait.

```APIDOC
## GlobalAlloc::alloc_zeroed

### Description
Behaves like `alloc`, but also ensures that the contents are set to zero before being returned.

### Safety
This is an `unsafe` function. The caller must ensure that the layout is valid and that memory is managed correctly.

### Parameters
- `layout` (`Layout`): Describes the size and alignment of the memory to be allocated.

### Returns
- `*mut u8`: A raw pointer to the beginning of the zeroed allocated memory block.
```

--------------------------------

### Test: Free Zeroed Allocated Memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Verifies that memory allocated with `alloc_zeroed` can be correctly deallocated.

```rust
unsafe {
            let layout = Layout::from_size_align(8, 8).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc_zeroed(layout);
            alloc.dealloc(ptr, layout);
        }
```

--------------------------------

### Test: Free Allocated Memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Verifies that memory allocated with `alloc` can be correctly deallocated.

```rust
unsafe {
            let layout = Layout::from_size_align(8, 8).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc(layout);
            alloc.dealloc(ptr, layout);
        }
```

--------------------------------

### GlobalAlloc for BEMalloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Implementation of the `GlobalAlloc` trait for `BEMalloc`, providing core memory allocation and deallocation functionalities.

```APIDOC
## GlobalAlloc for BEMalloc

### Description
Provides the core memory management functions for the `BEMalloc` allocator by implementing the `GlobalAlloc` trait.

### Methods

#### `alloc(&self, layout: Layout) -> *mut u8`
Allocates memory as described by the given `layout`.

#### `dealloc(&self, ptr: *mut u8, layout: Layout)`
Deallocates the block of memory at the given `ptr` pointer with the given `layout`.

#### `alloc_zeroed(&self, layout: Layout) -> *mut u8`
Behaves like `alloc`, but also ensures that the contents are set to zero before being returned.

#### `realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8`
Shrinks or grows a block of memory to the given `new_size` in bytes. The block is described by the given `ptr` pointer and `layout`.
```

--------------------------------

### Try Conversion from Another Type

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=u32+-%3E+bool

Attempts to perform a conversion from type `U` to type `T`. Returns a `Result` indicating success or failure. Relies on `U: Into<T>`.

```rust
type Error = Infallible
```

```rust
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
```

--------------------------------

### Convert From Self with From Trait

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Returns the argument unchanged, as part of the `From<T>` for `T` implementation.

```rust
fn from(t: T) -> T
```

--------------------------------

### Test: Free Reallocated Memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Verifies that memory reallocated with `realloc` can be correctly deallocated.

```rust
unsafe {
            let layout = Layout::from_size_align(8, 8).unwrap();
            let new_size = 16;
            let new_layout = Layout::from_size_align(new_size, layout.align()).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc(layout);
            let ptr = alloc.realloc(ptr, layout, new_size);
            alloc.dealloc(ptr, new_layout);
        }
```

--------------------------------

### GlobalAlloc for BEMalloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Implements the `GlobalAlloc` trait for BEMalloc, providing core memory allocation and deallocation functionalities.

```APIDOC
## GlobalAlloc for BEMalloc

### Description
Implements the `GlobalAlloc` trait, enabling BEMalloc to be used as the global memory allocator for Rust.

### Methods
#### `alloc(&self, layout: Layout) -> *mut u8`
Allocates memory according to the specified `layout`.

#### `dealloc(&self, ptr: *mut u8, layout: Layout)`
Deallocates a block of memory pointed to by `ptr` with the given `layout`.

#### `alloc_zeroed(&self, layout: Layout) -> *mut u8`
Allocates memory and ensures its contents are initialized to zero.

#### `realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8`
Shrinks or grows an existing memory block to `new_size` bytes, as described by `ptr` and `layout`.
```

--------------------------------

### Rust BEMalloc: Test memory deallocation with initialization

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Tests memory deallocation after initializing the BEMalloc allocator. This ensures that the allocator functions correctly when its initialization routine has been called.

```rust
    #[test]
    fn it_frees_allocated_memory_with_init() {
        unsafe {
            let layout = Layout::from_size_align(8, 8).unwrap();
            let alloc = BEMalloc::new();
            BEMalloc::init();

            let ptr = alloc.alloc(layout);
            alloc.dealloc(ptr, layout);
        }
    }
```

--------------------------------

### BEMalloc::try_from<bool, u32>

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=u32+-%3E+bool

Attempts to convert a u32 value into a bool. This is part of the TryFrom trait implementation for BEMalloc.

```APIDOC
## BEMalloc::try_from<bool, u32>

### Description
Attempts to convert a u32 value into a bool. This is part of the TryFrom trait implementation for BEMalloc.

### Method
try_from

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
None

### Response
#### Success Response (Result<bool, Infallible>)
- **Success**: Returns `Ok(bool)` if the conversion is successful.
- **Error**: Returns `Err(Infallible)` if the conversion fails (though `Infallible` indicates this specific conversion will not fail).

#### Response Example
```json
{
  "example": "Ok(true)"
}
```
```

--------------------------------

### BEMalloc Global Allocator Implementation

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Defines the `BEMalloc` struct which wraps an underlying allocator implementation (`BEMallocImpl`). It implements the `GlobalAlloc` trait, providing `alloc`, `dealloc`, `alloc_zeroed`, and `realloc` methods that delegate to the wrapped allocator.

```rust
use core::alloc::{GlobalAlloc, Layout};

/// A memory allocator that can be registered as the standard library’s default
/// through the `#[global_allocator]` attribute.
pub struct BEMalloc {
    alloc_impl: BEMallocImpl,
}

unsafe impl GlobalAlloc for BEMalloc {
    #[inline]
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        unsafe { self.alloc_impl.alloc(layout) }
    }

    #[inline]
    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
        unsafe { self.alloc_impl.dealloc(ptr, layout) }
    }

    #[inline]
    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
        unsafe { self.alloc_impl.alloc_zeroed(layout) }
    }

    #[inline]
    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
        unsafe { self.alloc_impl.realloc(ptr, layout, new_size) }
    }
}

impl Default for BEMalloc {
    #[inline]
    fn default() -> Self {
        Self::new()
    }
}

impl BEMalloc {
    /// Create a new instance of allocator.
    #[inline]
    pub const fn new() -> Self {
        Self {
            alloc_impl: BEMallocImpl,
        }
    }
}

```

--------------------------------

### Allocate Memory with BEMalloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Allocates a block of memory according to the specified layout. This is a core function for the GlobalAlloc trait implementation.

```rust
unsafe fn alloc(&self, layout: Layout) -> *mut u8
```

--------------------------------

### Try Convert Into Another Type with TryInto Trait

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Attempts to convert the current type into another type `U`. Returns a `Result` indicating success or failure.

```rust
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
```

--------------------------------

### Try Conversion to Another Type

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=u32+-%3E+bool

Attempts to convert the current type into another type `U` using `U::try_from(self)`. Returns a `Result` indicating success or failure.

```rust
type Error = <U as TryFrom<T>>::Error
```

```rust
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
```

--------------------------------

### Rust BEMalloc: Test basic memory deallocation

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Tests the functionality of allocating and deallocating a small block of memory using BEMalloc. This is a fundamental test for the allocator's core operations.

```rust
    #[test]
    fn it_frees_allocated_memory() {
        unsafe {
            let layout = Layout::from_size_align(8, 8).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc(layout);
            alloc.dealloc(ptr, layout);
        }
    }
```

--------------------------------

### Create New BEMalloc Instance

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Creates a new, independent instance of the BEMalloc allocator. This function is part of the BEMalloc struct's direct implementations.

```rust
pub const fn new() -> Self
```

--------------------------------

### Rust BEMalloc: Test deallocation of large zeroed memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Tests the deallocation of a large memory block that was allocated and zeroed. This verifies the allocator's performance with large, zero-initialized memory regions.

```rust
    #[test]
    fn it_frees_zero_allocated_big_memory() {
        unsafe {
            let layout = Layout::from_size_align(1 << 20, 32).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc_zeroed(layout);
            alloc.dealloc(ptr, layout);
        }
    }
```

--------------------------------

### Rust BEMalloc: Test deallocation of large memory block

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Tests the deallocation of a large memory block (1MB) using BEMalloc. This verifies the allocator's ability to handle larger memory requests and deallocations efficiently.

```rust
    #[test]
    fn it_frees_allocated_big_memory() {
        unsafe {
            let layout = Layout::from_size_align(1 << 20, 32).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc(layout);
            alloc.dealloc(ptr, layout);
        }
    }
```

--------------------------------

### Rust BEMalloc: Test reallocation of memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Tests the reallocation of a small memory block using BEMalloc. This verifies the `realloc` functionality, ensuring memory can be resized and its contents preserved.

```rust
    #[test]
    fn it_frees_reallocated_memory() {
        unsafe {
            let layout = Layout::from_size_align(8, 8).unwrap();
            let new_size = 16;
            let new_layout = Layout::from_size_align(new_size, layout.align()).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc(layout);
            let ptr = alloc.realloc(ptr, layout, new_size);
            alloc.dealloc(ptr, new_layout);
        }
    }
```

--------------------------------

### Rust BEMalloc: Test deallocation of zeroed memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Tests the deallocation of memory that was allocated using `alloc_zeroed`. This ensures that memory initialized to zero is correctly managed and deallocated.

```rust
    #[test]
    fn it_frees_zero_allocated_memory() {
        unsafe {
            let layout = Layout::from_size_align(8, 8).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc_zeroed(layout);
            alloc.dealloc(ptr, layout);
        }
    }
```

--------------------------------

### Default Trait Implementation

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=std%3A%3Avec

Provides the default value for the BEMalloc type.

```APIDOC
## fn default() -> Self

### Description
Returns the default value for the `BEMalloc` type.

### Returns
A new `BEMalloc` instance representing the default state.
```

--------------------------------

### Reallocate Memory with BEMalloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Shrinks or grows an existing memory block to a new size. It takes the current pointer, layout, and the desired new size.

```rust
unsafe fn realloc( &self, ptr: *mut u8, layout: Layout, new_size: usize, ) -> *mut u8
```

--------------------------------

### Rust BEMalloc: Test reallocation of large memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html?search=u32+-%3E+bool

Tests the reallocation of a large memory block using BEMalloc. This checks the `realloc` function's behavior with significant memory sizes, ensuring it handles resizing efficiently.

```rust
    #[test]
    fn it_frees_reallocated_big_memory() {
        unsafe {
            let layout = Layout::from_size_align(1 << 20, 32).unwrap();
            let new_size = 2 << 20;
            let new_layout = Layout::from_size_align(new_size, layout.align()).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc(layout);
            let ptr = alloc.realloc(ptr, layout, new_size);
            alloc.dealloc(ptr, new_layout);
        }
    }
```

--------------------------------

### Test: Free Zeroed Large Allocated Memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Tests the deallocation of a large block of memory allocated with `alloc_zeroed`.

```rust
unsafe {
            let layout = Layout::from_size_align(1 << 20, 32).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc_zeroed(layout);
            alloc.dealloc(ptr, layout);
        }
```

--------------------------------

### Test: Free Reallocated Large Memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Tests the deallocation of a large block of memory after reallocation.

```rust
unsafe {
            let layout = Layout::from_size_align(1 << 20, 32).unwrap();
            let new_size = 2 << 20;
            let new_layout = Layout::from_size_align(new_size, layout.align()).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc(layout);
            let ptr = alloc.realloc(ptr, layout, new_size);
            alloc.dealloc(ptr, new_layout);
        }
```

--------------------------------

### Try Convert From Another Type with TryFrom Trait

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Attempts to convert a value of type `U` into type `T`. Returns a `Result` indicating success or failure.

```rust
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
```

--------------------------------

### Default BEMalloc Instance

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Provides the default value for the BEMalloc type, as required by the Default trait implementation.

```rust
fn default() -> Self
```

--------------------------------

### Test: Free Large Allocated Memory

Source: https://docs.rs/malloc-best-effort/0.1.4/src/malloc_best_effort/lib.rs.html

Tests the deallocation of a large block of memory.

```rust
unsafe {
            let layout = Layout::from_size_align(1 << 20, 32).unwrap();
            let alloc = BEMalloc::new();

            let ptr = alloc.alloc(layout);
            alloc.dealloc(ptr, layout);
        }
```

--------------------------------

### Default::default

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html

Returns the default value for the BEMalloc type. This implementation allows BEMalloc to be used with Rust's default value mechanisms.

```APIDOC
## Default::default

### Description
Returns the “default value” for a type.

### Returns
- `Self`: The default instance of BEMalloc.
```

--------------------------------

### GlobalAlloc::realloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html

Shrinks or grows an allocated block of memory to a new size. This is an unsafe function required by the GlobalAlloc trait.

```APIDOC
## GlobalAlloc::realloc

### Description
Shrinks or grows a block of memory to the given `new_size` in bytes. The block is described by the given `ptr` pointer and `layout`.

### Safety
This is an `unsafe` function. The caller must ensure that `ptr` is a valid pointer previously allocated by this allocator and that `layout` describes the original allocation.

### Parameters
- `ptr` (`*mut u8`): A pointer to the memory block to reallocate.
- `layout` (`Layout`): The layout of the original memory block.
- `new_size` (`usize`): The desired new size in bytes for the memory block.

### Returns
- `*mut u8`: A raw pointer to the beginning of the reallocated memory block. This may be the same as `ptr` or a new location.
```

--------------------------------

### GlobalAlloc::dealloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html

Deallocates a previously allocated block of memory. This is an unsafe function required by the GlobalAlloc trait.

```APIDOC
## GlobalAlloc::dealloc

### Description
Deallocates the block of memory at the given `ptr` pointer with the given `layout`.

### Safety
This is an `unsafe` function. The caller must ensure that `ptr` is a valid pointer previously allocated by this allocator and that `layout` matches the original allocation.

### Parameters
- `ptr` (`*mut u8`): A pointer to the memory block to deallocate.
- `layout` (`Layout`): The layout of the memory block being deallocated.
```

--------------------------------

### BEMalloc Struct Definition

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Defines the BEMalloc struct, which serves as a private memory allocator. It is intended to be registered globally.

```rust
pub struct BEMalloc { /* private fields */ }
```

--------------------------------

### Deallocate Memory with BEMalloc

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Deallocates a previously allocated block of memory at the given pointer and layout. This is essential for memory management.

```rust
unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout)
```

--------------------------------

### Borrow Immutably with Borrow Trait

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Provides an immutable borrow to the contained type. This is part of the blanket implementation of the `Borrow` trait.

```rust
fn borrow(&self) -> &T
```

--------------------------------

### Convert Into Another Type with Into Trait

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Converts the current type into another type `U` if `U` implements `From<T>`. This is part of the blanket `Into<U>` implementation.

```rust
fn into(self) -> U
```

--------------------------------

### Borrow Mutably with BorrowMut Trait

Source: https://docs.rs/malloc-best-effort/0.1.4/malloc_best_effort/struct.BEMalloc.html?search=

Provides a mutable borrow to the contained type. This is part of the blanket implementation of the `BorrowMut` trait.

```rust
fn borrow_mut(&mut self) -> &mut T
```
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