### Arc::try_clone_from_ref Example

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Example usage of the experimental try_clone_from_ref API for Arc.

```rust
#![feature(clone_from_ref)]
#![feature(allocator_api)]
use std::sync::Arc;

let hello: Arc<str> = Arc::try_clone_from_ref("hello")?;
```

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

### Quick start with CJClassifier

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/index.html

Demonstrates loading the bundled classifier and detecting the language of sample strings.

```rust
use cjclassifier::{CJClassifier, CJLanguage};

let classifier = CJClassifier::load_bundled().unwrap();
assert_eq!(classifier.detect("今天天气很好"), CJLanguage::ChineseSimplified);
assert_eq!(classifier.detect("ひらがな"), CJLanguage::Japanese);
```

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

### Arc::clone_from_ref Example

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Example usage of the experimental clone_from_ref API for Arc.

```rust
#![feature(clone_from_ref)]
use std::sync::Arc;

let hello: Arc<str> = Arc::clone_from_ref("hello");
```

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

### Get mutable reference to Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Retrieves a mutable reference if the Arc is unique, otherwise returns None.

```rust
use std::sync::Arc;

let mut x = Arc::new(3);
*Arc::get_mut(&mut x).unwrap() = 4;
assert_eq!(*x, 4);

let _y = Arc::clone(&x);
assert!(Arc::get_mut(&mut x).is_none());
```

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

### Detecting language from C/C++

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/index.html

Demonstrates loading a bundled model, performing language detection on a UTF-8 string, and freeing the classifier handle.

```c
#include "cjclassifier.h"

CJClassifierHandle *model = cj_load_bundled();
if (model) {
    const char *text = "今天天气很好";
    CJLanguageCode lang = cj_detect(model, text, strlen(text));
    // lang == CJ_CHINESE_SIMPLIFIED (1)
    cj_free(model);
}
```

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

### Creating a New Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Constructs a new Arc instance containing the provided data.

```rust
use std::sync::Arc;

let five = Arc::new(5);
```

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

### Results::new

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/struct.Results.html

Creates a new instance of the Results struct.

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

### Description
Creates a new instance of the Results struct with default values.

### Returns
- **Self** - A new instance of the Results struct.
```

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

### CJClassifier::load_bundled

Source: https://docs.rs/cjclassifier

Initializes a new CJClassifier instance by loading the bundled language models.

```APIDOC
## CJClassifier::load_bundled()

### Description
Loads the bundled unigram and bigram log-probability models for CJK language detection.

### Signature
`pub fn load_bundled() -> Result<CJClassifier, ...>`

### Returns
- **CJClassifier** - An instance of the classifier ready for text detection.
```

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

### CJClassifier::load_bundled

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/index.html

Initializes the classifier by loading bundled language models.

```APIDOC
## fn load_bundled()

### Description
Loads the bundled unigram and bigram log-probability models to initialize the classifier.

### Signature
`pub fn load_bundled() -> Result<CJClassifier, ...>`

### Returns
- **CJClassifier** - The initialized classifier instance.
```

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

### cj_load_file

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_load_file.html

Loads a model from a file path. The path must be a valid null-terminated UTF-8 string. The returned handle must be freed using cj_free.

```APIDOC
## cj_load_file

### Description
Loads a model from a file path. Returns a pointer to a CJClassifierHandle on success, or null on failure.

### Signature
`unsafe extern "C" fn cj_load_file(path: *const c_char) -> *mut CJClassifierHandle`

### Parameters
- **path** (*const c_char) - Required - A valid null-terminated UTF-8 string representing the file path.

### Safety
- The `path` argument must be a valid null-terminated UTF-8 string.
- The returned pointer must be freed with `cj_free` to avoid memory leaks.
```

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

### Implement AsRawFd for Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Demonstrates implementing a trait requiring AsRawFd for an Arc-wrapped UdpSocket.

```rust
use std::net::UdpSocket;
use std::sync::Arc;
trait MyTrait: AsRawFd {
}
impl MyTrait for Arc<UdpSocket> {}
impl MyTrait for Box<UdpSocket> {}
```

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

### Implement AsFd for Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Demonstrates implementing a trait requiring AsFd for an Arc-wrapped UdpSocket.

```rust
use std::net::UdpSocket;
use std::sync::Arc;

trait MyTrait: AsFd {}
impl MyTrait for Arc<UdpSocket> {}
impl MyTrait for Box<UdpSocket> {}
```

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

### Arc::as_ptr

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Provides a raw pointer to the data.

```APIDOC
## Arc::as_ptr

### Description
Provides a raw pointer to the data. The counts are not affected in any way and the `Arc` is not consumed. The pointer is valid for as long as there are strong counts in the `Arc`.
```

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

### Creating Arc with Fallible Allocation

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

try_new is an experimental API that returns a Result, allowing handling of allocation failures.

```rust
#![feature(allocator_api)]
use std::sync::Arc;

let five = Arc::try_new(5)?;
```

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

### cj_load_bundled()

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_load_bundled.html

Loads the bundled model. Returns a pointer to the classifier handle, or null if the operation fails.

```APIDOC
## Function: cj_load_bundled

### Description
Loads the bundled model. Returns a pointer to a `CJClassifierHandle` on success, or null on failure.

### Signature
`pub extern "C" fn cj_load_bundled() -> *mut CJClassifierHandle`

### Safety
The returned pointer must be freed with `cj_free` to avoid memory leaks.
```

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

### Constructing Arc from Raw Pointer

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Demonstrates converting a raw pointer back into an Arc to prevent memory leaks. The pointer must have been previously obtained via Arc::into_raw.

```rust
use std::sync::Arc;

let x = Arc::new("hello".to_owned());
let x_ptr = Arc::into_raw(x);

unsafe {
    // Convert back to an `Arc` to prevent leak.
    let x = Arc::from_raw(x_ptr);
    assert_eq!(&*x, "hello");

    // Further calls to `Arc::from_raw(x_ptr)` would be memory-unsafe.
}

// The memory was freed when `x` went out of scope above, so `x_ptr` is now dangling!
```

```rust
use std::sync::Arc;

let x: Arc<[u32]> = Arc::new([1, 2, 3]);
let x_ptr: *const [u32] = Arc::into_raw(x);

unsafe {
    let x: Arc<[u32; 3]> = Arc::from_raw(x_ptr.cast::<[u32; 3]>());
    assert_eq!(&*x, &[1, 2, 3]);
}
```

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

### Define CJ_LANGUAGES constant

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/constant.CJ_LANGUAGES.html

Represents the three CJ languages in index order.

```rust
pub const CJ_LANGUAGES: [CJLanguage; 3];
```

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

### Arc::into_raw_with_allocator

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Consumes the Arc, returning the wrapped pointer and allocator.

```APIDOC
## Arc::into_raw_with_allocator

### Description
Consumes the `Arc`, returning the wrapped pointer and allocator. To avoid a memory leak the pointer must be converted back to an `Arc` using `Arc::from_raw_in`.
```

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

### Creating Uninitialized Arc with Fallible Allocation

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

try_new_uninit provides a fallible way to allocate uninitialized memory for an Arc.

```rust
#![feature(allocator_api)]

use std::sync::Arc;

let mut five = Arc::<u32>::try_new_uninit()?;

// Deferred initialization:
Arc::get_mut(&mut five).unwrap().write(5);

let five = unsafe { five.assume_init() };

assert_eq!(*five, 5);
```

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

### Results::to_short_string

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/struct.Results.html

Generates a compact string representation of the language scores.

```APIDOC
## pub fn to_short_string(&self) -> String

### Description
Returns a compact, comma-separated representation of per-language relative scores, ordered from best to worst (e.g., “zh-hans:1.00,zh-hant:0.97,ja:0.85”).

### Returns
- **String** - A formatted string containing the relative scores.
```

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

### Clone Arc with try_clone_from_ref_in

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Constructs a new Arc with a clone of the value in the provided allocator, returning an error if allocation fails. Requires the clone_from_ref and allocator_api features.

```rust
#![feature(clone_from_ref)]
#![feature(allocator_api)]
use std::sync::Arc;
use std::alloc::System;

let hello: Arc<str, System> = Arc::try_clone_from_ref_in("hello", System)?;
```

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

### Construct Arc with custom allocator

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Creates a new Arc instance using a specified allocator.

```rust
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let five = Arc::new_in(5, System);
```

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

### cj_load_file function signature

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_load_file.html

The function signature for loading a model from a file path. It requires a null-terminated UTF-8 string and returns a pointer that must be freed.

```rust
#[unsafe(no_mangle)]
pub unsafe extern "C" fn cj_load_file(
    path: *const c_char,
) -> *mut CJClassifierHandle
```

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

### Clone Arc with clone_from_ref_in

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Constructs a new Arc with a clone of the value in the provided allocator. Requires the clone_from_ref and allocator_api features.

```rust
#![feature(clone_from_ref)]
#![feature(allocator_api)]
use std::sync::Arc;
use std::alloc::System;

let hello: Arc<str, System> = Arc::clone_from_ref_in("hello", System);
```

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

### cj_load_file

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/index.html

Loads a language classification model from a specified file path.

```APIDOC
## cj_load_file

### Description
Loads a model from a file path.

### Parameters
- **path** (const char*) - The file path to the model.

### Returns
- **CJClassifierHandle*** - A pointer to the classifier instance, or NULL if loading fails.
```

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

### Creating Zeroed Arc with Fallible Allocation

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

try_new_zeroed provides a fallible way to allocate and zero-initialize memory for an Arc.

```rust
#![feature( allocator_api)]

use std::sync::Arc;

let zero = Arc::<u32>::try_new_zeroed()?;
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0);
```

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

### cj_lang_index(lang: CJLanguage) -> Option<usize>

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/fn.cj_lang_index.html

Returns the internal array index for a given CJ language. Returns None if the language is Unknown.

```APIDOC
## Function: cj_lang_index

### Description
Returns the internal array index for a CJ language, or None for Unknown.

### Signature
`pub fn cj_lang_index(lang: CJLanguage) -> Option<usize>`

### Parameters
- **lang** (CJLanguage) - Required - The language identifier to look up.

### Returns
- **Option<usize>** - The internal index of the language, or None if the language is not recognized.
```

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

### Construct Arc with uninitialized contents

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Requires the allocator_api and get_mut_unchecked features. Use unsafe blocks to initialize the memory before calling assume_init.

```rust
#![feature(get_mut_unchecked)]
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let mut five = Arc::<u32, _>::new_uninit_in(System);

let five = unsafe {
    // Deferred initialization:
    Arc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);

    five.assume_init()
};

assert_eq!(*five, 5)
```

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

### cj_detect_detailed

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_detect_detailed.html

Performs detailed language detection on a provided UTF-8 text buffer.

```APIDOC
## cj_detect_detailed

### Description
Detects language with detailed results using a UTF-8 text buffer with an explicit length.

### Signature
`unsafe extern "C" fn cj_detect_detailed(model: *const CJClassifierHandle, text: *const c_char, len: usize, result: *mut CJResult) -> CJLanguageCode`

### Parameters
- **model** (*const CJClassifierHandle) - Required - A valid pointer to a classifier handle obtained from `cj_load_bundled` or `cj_load_file`.
- **text** (*const c_char) - Required - A pointer to at least `len` bytes of valid UTF-8 text.
- **len** (usize) - Required - The length of the text buffer.
- **result** (*mut CJResult) - Required - A valid pointer to a `CJResult` struct where the output will be stored.

### Returns
- **CJLanguageCode** - The detected language code.
```

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

### Construct Arc with zeroed contents

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Requires the allocator_api feature. The memory is initialized to zero bytes before the Arc is returned.

```rust
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let zero = Arc::<u32, _>::new_zeroed_in(System);
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0)
```

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

### cj_detect

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/index.html

Detects the language of a provided UTF-8 text buffer.

```APIDOC
## cj_detect

### Description
Detects the language of a UTF-8 text buffer with explicit length.

### Parameters
- **model** (CJClassifierHandle*) - The classifier handle.
- **text** (const char*) - The UTF-8 text buffer.
- **length** (size_t) - The length of the text buffer.

### Returns
- **CJLanguageCode** - The detected language code.
```

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

### Drop implementation for Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Demonstrates how the inner value is dropped only when the strong reference count reaches zero.

```rust
use std::sync::Arc;

struct Foo;

impl Drop for Foo {
    fn drop(&mut self) {
        println!("dropped!");
    }
}

let foo  = Arc::new(Foo);
let foo2 = Arc::clone(&foo);

drop(foo);    // Doesn't print anything
drop(foo2);   // Prints "dropped!"
```

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

### Arc::try_clone_from_ref_in

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Constructs a new Arc with a clone of a value in the provided allocator, returning an error if allocation fails.

```APIDOC
## Arc::try_clone_from_ref_in

### Description
Constructs a new `Arc<T>` with a clone of `value` in the provided allocator, returning an error if allocation fails.
```

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

### Convert Cow to Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Creates an atomically reference-counted pointer from a clone-on-write pointer by copying its content.

```rust
let cow: Cow<'_, str> = Cow::Borrowed("eggplant");
let shared: Arc<str> = Arc::from(cow);
assert_eq!("eggplant", &shared[..]);
```

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

### Construct zeroed Arc with fallible allocation

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Requires the allocator_api feature. Returns a Result and ensures memory is zeroed if allocation succeeds.

```rust
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let zero = Arc::<u32, _>::try_new_zeroed_in(System)?;
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0);
```

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

### Creating Uninitialized Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

new_uninit allocates memory for an Arc without initializing the contents, requiring manual initialization before use.

```rust
use std::sync::Arc;

let mut five = Arc::<u32>::new_uninit();

// Deferred initialization:
Arc::get_mut(&mut five).unwrap().write(5);

let five = unsafe { five.assume_init() };

assert_eq!(*five, 5)
```

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

### Construct Arc from raw pointer

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Reconstructs an Arc from a raw pointer previously obtained via into_raw_with_allocator. Requires the allocator_api feature.

```rust
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let x = Arc::new_in("hello".to_owned(), System);
let (x_ptr, alloc) = Arc::into_raw_with_allocator(x);

unsafe {
    // Convert back to an `Arc` to prevent leak.
    let x = Arc::from_raw_in(x_ptr, System);
    assert_eq!(&*x, "hello");

    // Further calls to `Arc::from_raw(x_ptr)` would be memory-unsafe.
}

// The memory was freed when `x` went out of scope above, so `x_ptr` is now dangling!
```

```rust
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let x: Arc<[u32], _> = Arc::new_in([1, 2, 3], System);
let x_ptr: *const [u32] = Arc::into_raw_with_allocator(x).0;

unsafe {
    let x: Arc<[u32; 3], _> = Arc::from_raw_in(x_ptr.cast::<[u32; 3]>(), System);
    assert_eq!(&*x, &[1, 2, 3]);
}
```

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

### Construct uninitialized Arc with fallible allocation

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Requires the allocator_api and get_mut_unchecked features. Handles allocation failure while allowing deferred initialization.

```rust
#![feature(allocator_api)]
#![feature(get_mut_unchecked)]

use std::sync::Arc;
use std::alloc::System;

let mut five = Arc::<u32, _>::try_new_uninit_in(System)?;

let five = unsafe {
    // Deferred initialization:
    Arc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);

    five.assume_init()
};

assert_eq!(*five, 5);
```

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

### CJClassifier::detect

Source: https://docs.rs/cjclassifier

Classifies the provided input text into a supported CJK language.

```APIDOC
## CJClassifier::detect(&self, text: &str) -> CJLanguage

### Description
Analyzes the input string and returns the detected language based on the internal probability models.

### Parameters
- **text** (&str) - The input text to classify.

### Returns
- **CJLanguage** - The detected language (ChineseSimplified, ChineseTraditional, or Japanese).
```

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

### Arc::clone_from_ref_in

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Constructs a new Arc with a clone of a value in the provided allocator.

```APIDOC
## Arc::clone_from_ref_in

### Description
Constructs a new `Arc<T>` with a clone of `value` in the provided allocator.
```

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

### Arc::allocator

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Returns a reference to the underlying allocator.

```APIDOC
## Arc::allocator

### Description
Returns a reference to the underlying allocator.
```

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

### cj_lang_index function signature

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/fn.cj_lang_index.html

Returns the internal array index for a CJ language, or None for Unknown.

```rust
pub fn cj_lang_index(lang: CJLanguage) -> Option<usize>
```

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

### CJClassifier::detect

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/index.html

Detects the language of the provided input text.

```APIDOC
## fn detect(&self, text: &str) -> CJLanguage

### Description
Analyzes the input string and returns the detected CJK language.

### Parameters
- **text** (&str) - The text to classify.

### Returns
- **CJLanguage** - The detected language (ChineseSimplified, ChineseTraditional, or Japanese).
```

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

### Unwrap Arc with try_unwrap

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Demonstrates extracting the inner value from an Arc if it has exactly one strong reference.

```rust
use std::sync::Arc;

let x = Arc::new(3);
assert_eq!(Arc::try_unwrap(x), Ok(3));

let x = Arc::new(4);
let _y = Arc::clone(&x);
assert_eq!(*Arc::try_unwrap(x).unwrap_err(), 4);
```

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

### cj_detect Function Signature

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_detect.html

The function signature for cj_detect, requiring a valid classifier handle and a pointer to a UTF-8 encoded string.

```rust
#[unsafe(no_mangle)]
pub unsafe extern "C" fn cj_detect(
    model: *const CJClassifierHandle,
    text: *const c_char,
    len: usize,
) -> CJLanguageCode
```

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

### cj_detect

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_detect.html

Detects the language of a UTF-8 text buffer using a provided classifier model handle.

```APIDOC
## cj_detect

### Description
Detect the language of a UTF-8 text buffer with explicit length.

### Signature
`unsafe extern "C" fn cj_detect(model: *const CJClassifierHandle, text: *const c_char, len: usize) -> CJLanguageCode`

### Parameters
- **model** (*const CJClassifierHandle) - Required - A valid pointer to a classifier model obtained from `cj_load_bundled` or `cj_load_file`.
- **text** (*const c_char) - Required - A pointer to a buffer containing at least `len` bytes of valid UTF-8 text.
- **len** (usize) - Required - The length of the text buffer in bytes.

### Returns
- **CJLanguageCode** - The detected language code.
```

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

### cj_load_bundled function signature

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_load_bundled.html

The function is marked as unsafe and no_mangle, and it returns a mutable pointer to a CJClassifierHandle.

```rust
#[unsafe(no_mangle)]
pub extern "C" fn cj_load_bundled() -> *mut CJClassifierHandle
```

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

### Map Arc value with try_map

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Attempts to map the value inside an Arc, reusing the allocation if possible. Requires the smart_pointer_try_map feature.

```rust
#![feature(smart_pointer_try_map)]

use std::sync::Arc;

let b = Arc::new(7);
let new = Arc::try_map(b, |&i| u32::try_from(i)).unwrap();
assert_eq!(*new, 7);
```

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

### Consume Arc with into_raw_with_allocator

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Consumes the Arc and returns the wrapped pointer and allocator. The pointer must be converted back to an Arc to avoid memory leaks.

```rust
#![feature(allocator_api)]
use std::sync::Arc;
use std::alloc::System;

let x = Arc::new_in("hello".to_owned(), System);
let (ptr, alloc) = Arc::into_raw_with_allocator(x);
assert_eq!(unsafe { &*ptr }, "hello");
let x = unsafe { Arc::from_raw_in(ptr, alloc) };
assert_eq!(&*x, "hello");
```

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

### Results Struct Definition

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/struct.Results.html

The primary data structure for storing language detection results.

```rust
pub struct Results {
    pub scores: Scores,
    pub total_scores: [f64; 3],
    pub boosts: [f64; 3],
    pub result: Option<CJLanguage>,
    pub gap: f64,
}
```

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

### CJLanguage Methods

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/enum.CJLanguage.html

Methods available on the CJLanguage enum for language identification and metadata retrieval.

```APIDOC
## Methods

### iso_code
Returns the ISO 639-1-style language code (e.g., "zh-hans", "ja").

### iso_code3
Returns the ISO 639-3-style language code (e.g., "zho-hans", "jpn").

### is_chinese
Returns true if the language is Chinese Simplified or Chinese Traditional.

### is_japanese
Returns true if the language is Japanese.

### from_string
Look up a language by name, ISO code, or alternate name (case-insensitive).
```

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

### cj_detect_detailed FFI Function Signature

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_detect_detailed.html

The function signature for cj_detect_detailed, which requires valid pointers for the model, text buffer, and result struct.

```rust
#[unsafe(no_mangle)]
pub unsafe extern "C" fn cj_detect_detailed(
    model: *const CJClassifierHandle,
    text: *const c_char,
    len: usize,
    result: *mut CJResult,
) -> CJLanguageCode
```

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

### Convert Box to Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Moves a boxed object into a new, reference-counted allocation.

```rust
let unique: Box<str> = Box::from("eggplant");
let shared: Arc<str> = Arc::from(unique);
assert_eq!("eggplant", &shared[..]);
```

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

### Check equality of Arcs

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Two Arcs are equal if their inner values are equal.

```rust
use std::sync::Arc;

let five = Arc::new(5);

assert!(five == Arc::new(5));
```

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

### Check inequality of Arcs

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Two Arcs are not equal if their inner values are not equal.

```rust
use std::sync::Arc;

let five = Arc::new(5);

assert!(five != Arc::new(6));
```

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

### Construct Arc with fallible allocation

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Requires the allocator_api feature. Returns a Result to handle potential allocation failures.

```rust
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let five = Arc::try_new_in(5, System)?;
```

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

### Arc::try_map

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Attempts to map the value in an Arc, reusing the allocation if possible.

```APIDOC
## Arc::try_map

### Description
Attempts to map the value in an `Arc`, reusing the allocation if possible. `f` is called on a reference to the value in the `Arc`, and if the operation succeeds, the result is returned, also in an `Arc`.
```

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

### CJResult Struct Definition

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/struct.CJResult.html

The structure definition for CJResult, marked with #[repr(C)] for FFI compatibility.

```rust
#[repr(C)]
pub struct CJResult {
    pub language: CJLanguageCode,
    pub gap: f64,
    pub total_scores: [f64; 3],
}
```

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

### Creating Zeroed Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

new_zeroed allocates memory for an Arc and initializes it with zero bytes.

```rust
use std::sync::Arc;

let zero = Arc::<u32>::new_zeroed();
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0)
```

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

### Inspect Arc reference counts

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Methods to retrieve the number of weak or strong references to an Arc allocation.

```rust
use std::sync::Arc;

let five = Arc::new(5);
let _weak_five = Arc::downgrade(&five);

// This assertion is deterministic because we haven't shared
// the `Arc` or `Weak` between threads.
assert_eq!(1, Arc::weak_count(&five));
```

```rust
use std::sync::Arc;

let five = Arc::new(5);
let _also_five = Arc::clone(&five);

// This assertion is deterministic because we haven't shared
// the `Arc` between threads.
assert_eq!(2, Arc::strong_count(&five));
```

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

### Compare Arcs using Ord

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Compares two Arcs by calling cmp() on their inner values.

```rust
use std::sync::Arc;
use std::cmp::Ordering;

let five = Arc::new(5);

assert_eq!(Ordering::Less, five.cmp(&Arc::new(6)));
```

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

### cj_free

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_free.html

Frees a classifier handle previously allocated by cj_load_bundled or cj_load_file.

```APIDOC
## cj_free

### Description
Frees a classifier handle. This function releases the memory associated with the provided classifier handle.

### Signature
`pub unsafe extern "C" fn cj_free(model: *mut CJClassifierHandle)`

### Safety
`model` must be a valid pointer from `cj_load_bundled` or `cj_load_file`, or null (in which case this is a no-op).
```

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

### Compare Arc values with less-than-or-equal

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Checks if the inner value of the first Arc is less than or equal to the second.

```rust
use std::sync::Arc;

let five = Arc::new(5);

assert!(five <= Arc::new(5));
```

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

### Compare Arc values with partial_cmp

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Performs a partial comparison between two Arc instances by comparing their inner values.

```rust
use std::sync::Arc;
use std::cmp::Ordering;

let five = Arc::new(5);

assert_eq!(Some(Ordering::Less), five.partial_cmp(&Arc::new(6)));
```

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

### Constructing Cyclic Arc References

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Use new_cyclic to create an Arc that contains a weak reference to itself, preventing memory leaks in circular structures.

```rust
use std::sync::{Arc, Weak};

struct Gadget {
    me: Weak<Gadget>,
}

impl Gadget {
    /// Constructs a reference counted Gadget.
    fn new() -> Arc<Self> {
        // `me` is a `Weak<Gadget>` pointing at the new allocation of the
        // `Arc` we're constructing.
        Arc::new_cyclic(|me| {
            // Create the actual struct here.
            Gadget { me: me.clone() }
        })
    }

    /// Returns a reference counted pointer to Self.
    fn me(&self) -> Arc<Self> {
        self.me.upgrade().unwrap()
    }
}
```

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

### Results::clear

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/struct.Results.html

Resets the current Results instance to its default state.

```APIDOC
## pub fn clear(&mut self)

### Description
Clears the current detection results and resets scores within the instance.
```

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

### Create Default Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Creates a new Arc containing the default value of the inner type.

```rust
use std::sync::Arc;

let x: Arc<i32> = Default::default();
assert_eq!(*x, 0);
```

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

### CJClassifier::load

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/struct.CJClassifier.html

Returns a cached classifier loaded from the bundled model. Subsequent calls return the same instance. Thread-safe.

```APIDOC
## pub fn load() -> Result<Arc<Self>>

### Description
Returns a cached classifier loaded from the bundled model. Subsequent calls return the same instance. Thread-safe.
```

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

### Access Arc raw pointer with as_ptr

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Provides a raw pointer to the data without affecting reference counts or consuming the Arc.

```rust
use std::sync::Arc;

let x = Arc::new("hello".to_owned());
let y = Arc::clone(&x);
let x_ptr = Arc::as_ptr(&x);
assert_eq!(x_ptr, Arc::as_ptr(&y));
assert_eq!(unsafe { &*x_ptr }, "hello");
```

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

### CJClassifier::set_tolerated_kana_threshold

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/struct.CJClassifier.html

Sets the kana fraction threshold used to classify text as Japanese.

```APIDOC
## pub fn set_tolerated_kana_threshold(&mut self, threshold: f64)

### Description
Set the kana fraction threshold above which text is classified as Japanese.
```

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

### Clone an Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Creates a new pointer to the same allocation, incrementing the strong reference count.

```rust
use std::sync::Arc;

let five = Arc::new(5);

let _ = Arc::clone(&five);
```

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

### Consuming Arc into Raw Pointer

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Consumes the Arc and returns the underlying raw pointer. The pointer must be converted back to an Arc to avoid memory leaks.

```rust
use std::sync::Arc;

let x = Arc::new("hello".to_owned());
let x_ptr = Arc::into_raw(x);
assert_eq!(unsafe { &*x_ptr }, "hello");
```

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

### Guarantee inner value extraction with into_inner

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Shows how into_inner guarantees that exactly one thread receives the inner value when multiple threads attempt to extract it from clones.

```rust
use std::sync::Arc;

let x = Arc::new(3);
let y = Arc::clone(&x);

// Two threads calling `Arc::into_inner` on both clones of an `Arc`:
let x_thread = std::thread::spawn(|| Arc::into_inner(x));
let y_thread = std::thread::spawn(|| Arc::into_inner(y));

let x_inner_value = x_thread.join().unwrap();
let y_inner_value = y_thread.join().unwrap();

// One of the threads is guaranteed to receive the inner value:
assert!(matches!(
    (x_inner_value, y_inner_value),
    (None, Some(3)) | (Some(3), None)
));
// The result could also be `(None, None)` if the threads called
// `Arc::try_unwrap(x).ok()` and `Arc::try_unwrap(y).ok()` instead.
```

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

### Compare Arc values with less-than

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Checks if the inner value of the first Arc is less than the second.

```rust
use std::sync::Arc;

let five = Arc::new(5);

assert!(five < Arc::new(6));
```

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

### Compare Arc values with greater-than-or-equal

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Checks if the inner value of the first Arc is greater than or equal to the second.

```rust
use std::sync::Arc;

let five = Arc::new(5);

assert!(five >= Arc::new(5));
```

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

### Comparing Arc Allocations

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Checks if two Arc pointers refer to the same allocation, ignoring metadata for dyn Trait pointers.

```rust
use std::sync::Arc;

let five = Arc::new(5);
let same_five = Arc::clone(&five);
let other_five = Arc::new(5);

assert!(Arc::ptr_eq(&five, &same_five));
assert!(!Arc::ptr_eq(&five, &other_five));
```

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

### Downgrade Arc to Weak pointer

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Creates a new Weak pointer to the allocation managed by the Arc.

```rust
use std::sync::Arc;

let five = Arc::new(5);

let weak_five = Arc::downgrade(&five);
```

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

### Convert T to Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Converts a value into an Arc, equivalent to calling Arc::new(t).

```rust
let x = 5;
let arc = Arc::new(5);

assert_eq!(Arc::from(x), arc);
```

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

### CJClassifierHandle Struct Representation

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

The internal struct representation of CJClassifierHandle.

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

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

### Prevent stack overflow with into_inner in Drop

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Uses into_inner within a custom Drop implementation to safely deallocate a linked list without recursion.

```rust
use std::sync::Arc;

// Definition of a simple singly linked list using `Arc`:
#[derive(Clone)]
struct LinkedList<T>(Option<Arc<Node<T>>>);
struct Node<T>(T, Option<Arc<Node<T>>>);

// Dropping a long `LinkedList<T>` relying on the destructor of `Arc`
// can cause a stack overflow. To prevent this, we can provide a
// manual `Drop` implementation that does the destruction in a loop:
impl<T> Drop for LinkedList<T> {
    fn drop(&mut self) {
        let mut link = self.0.take();
        while let Some(arc_node) = link.take() {
            if let Some(Node(_value, next)) = Arc::into_inner(arc_node) {
                link = next;
            }
        }
    }
}

// Implementation of `new` and `push` omitted
impl<T> LinkedList<T> {
    /* ... */
}

// The following code could have still caused a stack overflow
// despite the manual `Drop` impl if that `Drop` impl had used
// `Arc::try_unwrap(arc).ok()` instead of `Arc::into_inner(arc)`.

// Create a long list and clone it
let mut x = LinkedList::new();
let size = 100000;
for i in 0..size {
    x.push(i); // Adds i to the front of x
}
let y = x.clone();

// Drop the clones in parallel
let x_thread = std::thread::spawn(|| drop(x));
let y_thread = std::thread::spawn(|| drop(y));
x_thread.join().unwrap();
y_thread.join().unwrap();
```

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

### cj_free function signature

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/fn.cj_free.html

The function signature for cj_free, which is used to free a classifier handle.

```rust
#[unsafe(no_mangle)]
pub unsafe extern "C" fn cj_free(model: *mut CJClassifierHandle)
```

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

### Scores Struct Definition

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/struct.Scores.html

Defines the data structure used to accumulate per-language scoring metrics during text processing.

```rust
pub struct Scores {
    pub unigram_scores: [f64; 3],
    pub bigram_scores: [f64; 3],
    pub unigram_hits_per_lang: [i32; 3],
    pub bigram_hits_per_lang: [i32; 3],
    pub kana_count: i32,
    pub cj_char_count: i32,
}
```

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

### CJLanguage Enum Definition

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/enum.CJLanguage.html

The core enum structure representing supported languages with integer discriminants.

```rust
#[repr(C)]
pub enum CJLanguage {
    Unknown = 0,
    ChineseSimplified = 1,
    ChineseTraditional = 2,
    Japanese = 3,
}
```

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

### Unwrapping or Cloning Arc Values

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Returns the inner value if the Arc has a unique reference, otherwise returns a clone of the inner value.

```rust
let inner = String::from("test");
let ptr = inner.as_ptr();

let arc = Arc::new(inner);
let inner = Arc::unwrap_or_clone(arc);
// The inner value was not cloned
assert!(ptr::eq(ptr, inner.as_ptr()));

let arc = Arc::new(inner);
let arc2 = arc.clone();
let inner = Arc::unwrap_or_clone(arc);
// Because there were 2 references, we had to clone the inner value.
assert!(!ptr::eq(ptr, inner.as_ptr()));
// `arc2` is the last reference, so when we unwrap it we get back
// the original `String`.
let inner = Arc::unwrap_or_clone(arc2);
assert!(ptr::eq(ptr, inner.as_ptr()));
```

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

### Compare Arc values with greater-than

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Checks if the inner value of the first Arc is greater than the second.

```rust
use std::sync::Arc;

let five = Arc::new(5);

assert!(five > Arc::new(4));
```

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

### CJLanguageCode Type Definition

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJLanguageCode.html

The type alias definition for CJLanguageCode as an i32 integer.

```rust
pub type CJLanguageCode = i32;
```

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

### Mapping Arc Values

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Arc::map allows transforming the inner value of an Arc while potentially reusing the allocation.

```rust
#![feature(smart_pointer_try_map)]

use std::sync::Arc;

let r = Arc::new(7);
let new = Arc::map(r, |i| i + 7);
assert_eq!(*new, 14);
```

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

### CJClassifierHandle Definition

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

The definition of the CJClassifierHandle type alias.

```rust
pub type CJClassifierHandle = Arc<CJClassifier>;
```

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

### Increment strong reference count

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Manually increments the strong reference count for an Arc managed by a raw pointer. Requires the allocator_api feature.

```rust
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let five = Arc::new_in(5, System);

unsafe {
    let (ptr, _alloc) = Arc::into_raw_with_allocator(five);
    Arc::increment_strong_count_in(ptr, System);

    // This assertion is deterministic because we haven't shared
    // the `Arc` between threads.
    let five = Arc::from_raw_in(ptr, System);
    assert_eq!(2, Arc::strong_count(&five));
}
```

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

### Making Mutable References to Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Provides a mutable reference to the inner value, cloning the data if multiple references exist (clone-on-write).

```rust
use std::sync::Arc;

let mut data = Arc::new(5);

*Arc::make_mut(&mut data) += 1;         // Won't clone anything
let mut other_data = Arc::clone(&data); // Won't clone inner data
*Arc::make_mut(&mut data) += 1;         // Clones inner data
*Arc::make_mut(&mut data) += 1;         // Won't clone anything
*Arc::make_mut(&mut other_data) *= 2;   // Won't clone anything

// Now `data` and `other_data` point to different allocations.
assert_eq!(*data, 8);
assert_eq!(*other_data, 12);
```

```rust
use std::sync::Arc;

let mut data = Arc::new(75);
let weak = Arc::downgrade(&data);

assert!(75 == *data);
assert!(75 == *weak.upgrade().unwrap());

*Arc::make_mut(&mut data) += 1;

assert!(76 == *data);
assert!(weak.upgrade().is_none());
```

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

### Check Arc uniqueness

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Determines if the current Arc is the sole owner of the allocation.

```rust
#![feature(arc_is_unique)]

use std::sync::Arc;

let x = Arc::new(3);
assert!(Arc::is_unique(&x));

let y = Arc::clone(&x);
assert!(!Arc::is_unique(&x));
drop(y);

// Weak references also count, because they could be upgraded at any time.
let z = Arc::downgrade(&x);
assert!(!Arc::is_unique(&x));
```

```rust
#![feature(arc_is_unique)]

use std::sync::Arc;

let arc = Arc::new(5);
let pointer: *const i32 = &*arc;
assert!(Arc::is_unique(&arc));
assert_eq!(unsafe { *pointer }, 5);
```

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

### Incrementing Strong Reference Count

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Increments the strong reference count of an Arc via its raw pointer. The pointer must be valid and obtained from Arc::into_raw.

```rust
use std::sync::Arc;

let five = Arc::new(5);

unsafe {
    let ptr = Arc::into_raw(five);
    Arc::increment_strong_count(ptr);

    // This assertion is deterministic because we haven't shared
    // the `Arc` between threads.
    let five = Arc::from_raw(ptr);
    assert_eq!(2, Arc::strong_count(&five));
}
```

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

### Unsafe mutable access to Arc

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Provides unchecked mutable access to the inner value. Requires ensuring no other pointers exist or are accessed.

```rust
#![feature(get_mut_unchecked)]

use std::sync::Arc;

let mut x = Arc::new(String::new());
unsafe {
    Arc::get_mut_unchecked(&mut x).push_str("foo")
}
assert_eq!(*x, "foo");
```

```rust
#![feature(get_mut_unchecked)]

use std::sync::Arc;

let x: Arc<str> = Arc::from("Hello, world!");
let mut y: Arc<[u8]> = x.clone().into();
unsafe {
    // this is Undefined Behavior, because x's inner type is str, not [u8]
    Arc::get_mut_unchecked(&mut y).fill(0xff); // 0xff is invalid in UTF-8
}
println!("{}", &*x); // Invalid UTF-8 in a str
```

```rust
#![feature(get_mut_unchecked)]

use std::sync::Arc;

let x: Arc<&str> = Arc::new("Hello, world!");
{
    let s = String::from("Oh, no!");
    let mut y: Arc<&str> = x.clone();
    unsafe {
        // this is Undefined Behavior, because x's inner type
        // is &'long str, not &'short str
        *Arc::get_mut_unchecked(&mut y) = &s;
    }
}
println!("{}", &*x); // Use-after-free
```

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

### Decrementing Arc Strong Count

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Decrements the strong reference count of an Arc instance using a specific allocator. Requires the allocator_api feature.

```rust
#![feature(allocator_api)]

use std::sync::Arc;
use std::alloc::System;

let five = Arc::new_in(5, System);

unsafe {
    let (ptr, _alloc) = Arc::into_raw_with_allocator(five);
    Arc::increment_strong_count_in(ptr, System);

    // Those assertions are deterministic because we haven't shared
    // the `Arc` between threads.
    let five = Arc::from_raw_in(ptr, System);
    assert_eq!(2, Arc::strong_count(&five));
    Arc::decrement_strong_count_in(ptr, System);
    assert_eq!(1, Arc::strong_count(&five));
}
```

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

### Decrementing Strong Reference Count

Source: https://docs.rs/cjclassifier/0.1.0/cjclassifier/ffi/type.CJClassifierHandle.html

Decrements the strong reference count of an Arc via its raw pointer. This can be used to release the final Arc instance.

```rust
use std::sync::Arc;

let five = Arc::new(5);

unsafe {
    let ptr = Arc::into_raw(five);
    Arc::increment_strong_count(ptr);

    // Those assertions are deterministic because we haven't shared
    // the `Arc` between threads.
    let five = Arc::from_raw(ptr);
    assert_eq!(2, Arc::strong_count(&five));
    Arc::decrement_strong_count(ptr);
    assert_eq!(1, Arc::strong_count(&five));
}
```

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