std::ffi::c_str

Struct CString

source
pub struct CString { /* private fields */ }
๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)
Expand description

A type representing an owned, C-compatible, nul-terminated string with no nul bytes in the middle.

This type serves the purpose of being able to safely generate a C-compatible string from a Rust byte slice or vector. An instance of this type is a static guarantee that the underlying bytes contain no interior 0 bytes (โ€œnul charactersโ€) and that the final byte is 0 (โ€œnul terminatorโ€).

CString is to &CStr as String is to &str: the former in each pair are owned strings; the latter are borrowed references.

ยงCreating a CString

A CString is created from either a byte slice or a byte vector, or anything that implements Into<Vec<u8>> (for example, you can build a CString straight out of a String or a &str, since both implement that trait). You can create a CString from a literal with CString::from(c"Text").

The CString::new method will actually check that the provided &[u8] does not have 0 bytes in the middle, and return an error if it finds one.

ยงExtracting a raw pointer to the whole C string

CString implements an as_ptr method through the Deref trait. This method will give you a *const c_char which you can feed directly to extern functions that expect a nul-terminated string, like Cโ€™s strdup(). Notice that as_ptr returns a read-only pointer; if the C code writes to it, that causes undefined behavior.

ยงExtracting a slice of the whole C string

Alternatively, you can obtain a &[u8] slice from a CString with the CString::as_bytes method. Slices produced in this way do not contain the trailing nul terminator. This is useful when you will be calling an extern function that takes a *const u8 argument which is not necessarily nul-terminated, plus another argument with the length of the string โ€” like Cโ€™s strndup(). You can of course get the sliceโ€™s length with its len method.

If you need a &[u8] slice with the nul terminator, you can use CString::as_bytes_with_nul instead.

Once you have the kind of slice you need (with or without a nul terminator), you can call the sliceโ€™s own as_ptr method to get a read-only raw pointer to pass to extern functions. See the documentation for that function for a discussion on ensuring the lifetime of the raw pointer.

ยงExamples

โ“˜
use std::ffi::CString;
use std::os::raw::c_char;

extern "C" {
    fn my_printer(s: *const c_char);
}

// We are certain that our string doesn't have 0 bytes in the middle,
// so we can .expect()
let c_to_print = CString::new("Hello, world!").expect("CString::new failed");
unsafe {
    my_printer(c_to_print.as_ptr());
}

ยงSafety

CString is intended for working with traditional C-style strings (a sequence of non-nul bytes terminated by a single nul byte); the primary use case for these kinds of strings is interoperating with C-like code. Often you will need to transfer ownership to/from that external code. It is strongly recommended that you thoroughly read through the documentation of CString before use, as improper ownership management of CString instances can lead to invalid memory accesses, memory leaks, and other memory errors.

Implementationsยง

sourceยง

impl CString

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pub fn new<T>(t: T) -> Result<CString, NulError>
where T: Into<Vec<u8>>,

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Creates a new C-compatible string from a container of bytes.

This function will consume the provided data and use the underlying bytes to construct a new string, ensuring that there is a trailing 0 byte. This trailing 0 byte will be appended by this function; the provided data should not contain any 0 bytes in it.

ยงExamples
โ“˜
use std::ffi::CString;
use std::os::raw::c_char;

extern "C" { fn puts(s: *const c_char); }

let to_print = CString::new("Hello!").expect("CString::new failed");
unsafe {
    puts(to_print.as_ptr());
}
ยงErrors

This function will return an error if the supplied bytes contain an internal 0 byte. The NulError returned will contain the bytes as well as the position of the nul byte.

source

pub unsafe fn from_vec_unchecked(v: Vec<u8>) -> CString

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Creates a C-compatible string by consuming a byte vector, without checking for interior 0 bytes.

Trailing 0 byte will be appended by this function.

This method is equivalent to CString::new except that no runtime assertion is made that v contains no 0 bytes, and it requires an actual byte vector, not anything that can be converted to one with Into.

ยงExamples
use std::ffi::CString;

let raw = b"foo".to_vec();
unsafe {
    let c_string = CString::from_vec_unchecked(raw);
}
source

pub unsafe fn from_raw(ptr: *mut i8) -> CString

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Retakes ownership of a CString that was transferred to C via CString::into_raw.

Additionally, the length of the string will be recalculated from the pointer.

ยงSafety

This should only ever be called with a pointer that was earlier obtained by calling CString::into_raw. Other usage (e.g., trying to take ownership of a string that was allocated by foreign code) is likely to lead to undefined behavior or allocator corruption.

It should be noted that the length isnโ€™t just โ€œrecomputed,โ€ but that the recomputed length must match the original length from the CString::into_raw call. This means the CString::into_raw/from_raw methods should not be used when passing the string to C functions that can modify the stringโ€™s length.

Note: If you need to borrow a string that was allocated by foreign code, use CStr. If you need to take ownership of a string that was allocated by foreign code, you will need to make your own provisions for freeing it appropriately, likely with the foreign codeโ€™s API to do that.

ยงExamples

Creates a CString, pass ownership to an extern function (via raw pointer), then retake ownership with from_raw:

โ“˜
use std::ffi::CString;
use std::os::raw::c_char;

extern "C" {
    fn some_extern_function(s: *mut c_char);
}

let c_string = CString::new("Hello!").expect("CString::new failed");
let raw = c_string.into_raw();
unsafe {
    some_extern_function(raw);
    let c_string = CString::from_raw(raw);
}
source

pub fn into_raw(self) -> *mut i8

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Consumes the CString and transfers ownership of the string to a C caller.

The pointer which this function returns must be returned to Rust and reconstituted using CString::from_raw to be properly deallocated. Specifically, one should not use the standard C free() function to deallocate this string.

Failure to call CString::from_raw will lead to a memory leak.

The C side must not modify the length of the string (by writing a nul byte somewhere inside the string or removing the final one) before it makes it back into Rust using CString::from_raw. See the safety section in CString::from_raw.

ยงExamples
use std::ffi::CString;

let c_string = CString::new("foo").expect("CString::new failed");

let ptr = c_string.into_raw();

unsafe {
    assert_eq!(b'f', *ptr as u8);
    assert_eq!(b'o', *ptr.add(1) as u8);
    assert_eq!(b'o', *ptr.add(2) as u8);
    assert_eq!(b'\0', *ptr.add(3) as u8);

    // retake pointer to free memory
    let _ = CString::from_raw(ptr);
}
source

pub fn into_string(self) -> Result<String, IntoStringError>

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Converts the CString into a String if it contains valid UTF-8 data.

On failure, ownership of the original CString is returned.

ยงExamples
use std::ffi::CString;

let valid_utf8 = vec![b'f', b'o', b'o'];
let cstring = CString::new(valid_utf8).expect("CString::new failed");
assert_eq!(cstring.into_string().expect("into_string() call failed"), "foo");

let invalid_utf8 = vec![b'f', 0xff, b'o', b'o'];
let cstring = CString::new(invalid_utf8).expect("CString::new failed");
let err = cstring.into_string().err().expect("into_string().err() failed");
assert_eq!(err.utf8_error().valid_up_to(), 1);
source

pub fn into_bytes(self) -> Vec<u8> โ“˜

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Consumes the CString and returns the underlying byte buffer.

The returned buffer does not contain the trailing nul terminator, and it is guaranteed to not have any interior nul bytes.

ยงExamples
use std::ffi::CString;

let c_string = CString::new("foo").expect("CString::new failed");
let bytes = c_string.into_bytes();
assert_eq!(bytes, vec![b'f', b'o', b'o']);
source

pub fn into_bytes_with_nul(self) -> Vec<u8> โ“˜

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Equivalent to CString::into_bytes() except that the returned vector includes the trailing nul terminator.

ยงExamples
use std::ffi::CString;

let c_string = CString::new("foo").expect("CString::new failed");
let bytes = c_string.into_bytes_with_nul();
assert_eq!(bytes, vec![b'f', b'o', b'o', b'\0']);
source

pub fn as_bytes(&self) -> &[u8] โ“˜

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Returns the contents of this CString as a slice of bytes.

The returned slice does not contain the trailing nul terminator, and it is guaranteed to not have any interior nul bytes. If you need the nul terminator, use CString::as_bytes_with_nul instead.

ยงExamples
use std::ffi::CString;

let c_string = CString::new("foo").expect("CString::new failed");
let bytes = c_string.as_bytes();
assert_eq!(bytes, &[b'f', b'o', b'o']);
source

pub fn as_bytes_with_nul(&self) -> &[u8] โ“˜

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Equivalent to CString::as_bytes() except that the returned slice includes the trailing nul terminator.

ยงExamples
use std::ffi::CString;

let c_string = CString::new("foo").expect("CString::new failed");
let bytes = c_string.as_bytes_with_nul();
assert_eq!(bytes, &[b'f', b'o', b'o', b'\0']);
source

pub fn as_c_str(&self) -> &CStr

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Extracts a CStr slice containing the entire string.

ยงExamples
use std::ffi::{CString, CStr};

let c_string = CString::new(b"foo".to_vec()).expect("CString::new failed");
let cstr = c_string.as_c_str();
assert_eq!(cstr,
           CStr::from_bytes_with_nul(b"foo\0").expect("CStr::from_bytes_with_nul failed"));
source

pub fn into_boxed_c_str(self) -> Box<CStr>

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Converts this CString into a boxed CStr.

ยงExamples
use std::ffi::{CString, CStr};

let c_string = CString::new(b"foo".to_vec()).expect("CString::new failed");
let boxed = c_string.into_boxed_c_str();
assert_eq!(&*boxed,
           CStr::from_bytes_with_nul(b"foo\0").expect("CStr::from_bytes_with_nul failed"));
source

pub unsafe fn from_vec_with_nul_unchecked(v: Vec<u8>) -> CString

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Converts a Vec<u8> to a CString without checking the invariants on the given Vec.

ยงSafety

The given Vec must have one nul byte as its last element. This means it cannot be empty nor have any other nul byte anywhere else.

ยงExample
use std::ffi::CString;
assert_eq!(
    unsafe { CString::from_vec_with_nul_unchecked(b"abc\0".to_vec()) },
    unsafe { CString::from_vec_unchecked(b"abc".to_vec()) }
);
source

pub fn from_vec_with_nul(v: Vec<u8>) -> Result<CString, FromVecWithNulError>

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Attempts to converts a Vec<u8> to a CString.

Runtime checks are present to ensure there is only one nul byte in the Vec, its last element.

ยงErrors

If a nul byte is present and not the last element or no nul bytes is present, an error will be returned.

ยงExamples

A successful conversion will produce the same result as CString::new when called without the ending nul byte.

use std::ffi::CString;
assert_eq!(
    CString::from_vec_with_nul(b"abc\0".to_vec())
        .expect("CString::from_vec_with_nul failed"),
    CString::new(b"abc".to_vec()).expect("CString::new failed")
);

An incorrectly formatted Vec will produce an error.

use std::ffi::{CString, FromVecWithNulError};
// Interior nul byte
let _: FromVecWithNulError = CString::from_vec_with_nul(b"a\0bc".to_vec()).unwrap_err();
// No nul byte
let _: FromVecWithNulError = CString::from_vec_with_nul(b"abc".to_vec()).unwrap_err();

Methods from Deref<Target = CStr>ยง

source

pub fn as_ptr(&self) -> *const i8

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Returns the inner pointer to this C string.

The returned pointer will be valid for as long as self is, and points to a contiguous region of memory terminated with a 0 byte to represent the end of the string.

The type of the returned pointer is *const c_char, and whether itโ€™s an alias for *const i8 or *const u8 is platform-specific.

WARNING

The returned pointer is read-only; writing to it (including passing it to C code that writes to it) causes undefined behavior.

It is your responsibility to make sure that the underlying memory is not freed too early. For example, the following code will cause undefined behavior when ptr is used inside the unsafe block:

use std::ffi::CString;

// Do not do this:
let ptr = CString::new("Hello").expect("CString::new failed").as_ptr();
unsafe {
    // `ptr` is dangling
    *ptr;
}

This happens because the pointer returned by as_ptr does not carry any lifetime information and the CString is deallocated immediately after the CString::new("Hello").expect("CString::new failed").as_ptr() expression is evaluated. To fix the problem, bind the CString to a local variable:

use std::ffi::CString;

let hello = CString::new("Hello").expect("CString::new failed");
let ptr = hello.as_ptr();
unsafe {
    // `ptr` is valid because `hello` is in scope
    *ptr;
}

This way, the lifetime of the CString in hello encompasses the lifetime of ptr and the unsafe block.

source

pub fn count_bytes(&self) -> usize

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Returns the length of self. Like Cโ€™s strlen, this does not include the nul terminator.

Note: This method is currently implemented as a constant-time cast, but it is planned to alter its definition in the future to perform the length calculation whenever this method is called.

ยงExamples
use std::ffi::CStr;

let cstr = CStr::from_bytes_with_nul(b"foo\0").unwrap();
assert_eq!(cstr.count_bytes(), 3);

let cstr = CStr::from_bytes_with_nul(b"\0").unwrap();
assert_eq!(cstr.count_bytes(), 0);
source

pub fn is_empty(&self) -> bool

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Returns true if self.to_bytes() has a length of 0.

ยงExamples
use std::ffi::CStr;

let cstr = CStr::from_bytes_with_nul(b"foo\0")?;
assert!(!cstr.is_empty());

let empty_cstr = CStr::from_bytes_with_nul(b"\0")?;
assert!(empty_cstr.is_empty());
assert!(c"".is_empty());
source

pub fn to_bytes(&self) -> &[u8] โ“˜

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Converts this C string to a byte slice.

The returned slice will not contain the trailing nul terminator that this C string has.

Note: This method is currently implemented as a constant-time cast, but it is planned to alter its definition in the future to perform the length calculation whenever this method is called.

ยงExamples
use std::ffi::CStr;

let cstr = CStr::from_bytes_with_nul(b"foo\0").expect("CStr::from_bytes_with_nul failed");
assert_eq!(cstr.to_bytes(), b"foo");
source

pub fn to_bytes_with_nul(&self) -> &[u8] โ“˜

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Converts this C string to a byte slice containing the trailing 0 byte.

This function is the equivalent of CStr::to_bytes except that it will retain the trailing nul terminator instead of chopping it off.

Note: This method is currently implemented as a 0-cost cast, but it is planned to alter its definition in the future to perform the length calculation whenever this method is called.

ยงExamples
use std::ffi::CStr;

let cstr = CStr::from_bytes_with_nul(b"foo\0").expect("CStr::from_bytes_with_nul failed");
assert_eq!(cstr.to_bytes_with_nul(), b"foo\0");
source

pub fn bytes(&self) -> Bytes<'_> โ“˜

๐Ÿ”ฌThis is a nightly-only experimental API. (cstr_bytes #112115)

Iterates over the bytes in this C string.

The returned iterator will not contain the trailing nul terminator that this C string has.

ยงExamples
#![feature(cstr_bytes)]
use std::ffi::CStr;

let cstr = CStr::from_bytes_with_nul(b"foo\0").expect("CStr::from_bytes_with_nul failed");
assert!(cstr.bytes().eq(*b"foo"));
source

pub fn to_str(&self) -> Result<&str, Utf8Error>

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Yields a &str slice if the CStr contains valid UTF-8.

If the contents of the CStr are valid UTF-8 data, this function will return the corresponding &str slice. Otherwise, it will return an error with details of where UTF-8 validation failed.

ยงExamples
use std::ffi::CStr;

let cstr = CStr::from_bytes_with_nul(b"foo\0").expect("CStr::from_bytes_with_nul failed");
assert_eq!(cstr.to_str(), Ok("foo"));
source

pub fn to_string_lossy(&self) -> Cow<'_, str>

๐Ÿ”ฌThis is a nightly-only experimental API. (c_str_module #112134)

Converts a CStr into a Cow<str>.

If the contents of the CStr are valid UTF-8 data, this function will return a Cow::Borrowed(&str) with the corresponding &str slice. Otherwise, it will replace any invalid UTF-8 sequences with U+FFFD REPLACEMENT CHARACTER and return a Cow::Owned(&str) with the result.

ยงExamples

Calling to_string_lossy on a CStr containing valid UTF-8. The leading c on the string literal denotes a CStr.

use std::borrow::Cow;

assert_eq!(c"Hello World".to_string_lossy(), Cow::Borrowed("Hello World"));

Calling to_string_lossy on a CStr containing invalid UTF-8:

use std::borrow::Cow;

assert_eq!(
    c"Hello \xF0\x90\x80World".to_string_lossy(),
    Cow::Owned(String::from("Hello ๏ฟฝWorld")) as Cow<'_, str>
);

Trait Implementationsยง

1.7.0 ยท sourceยง

impl AsRef<CStr> for CString

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fn as_ref(&self) -> &CStr

Converts this type into a shared reference of the (usually inferred) input type.
1.3.0 ยท sourceยง

impl Borrow<CStr> for CString

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fn borrow(&self) -> &CStr

Immutably borrows from an owned value. Read more
1.64.0 ยท sourceยง

impl Clone for CString

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fn clone(&self) -> CString

Returns a copy of the value. Read more
1.0.0 ยท sourceยง

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
1.0.0 ยท sourceยง

impl Debug for CString

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
1.10.0 ยท sourceยง

impl Default for CString

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fn default() -> CString

Creates an empty CString.

1.0.0 ยท sourceยง

impl Deref for CString

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type Target = CStr

The resulting type after dereferencing.
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fn deref(&self) -> &CStr

Dereferences the value.
1.13.0 ยท sourceยง

impl Drop for CString

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fn drop(&mut self)

Executes the destructor for this type. Read more
1.7.0 ยท sourceยง

impl From<&CStr> for CString

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fn from(s: &CStr) -> CString

Converts a &CStr into a CString by copying the contents into a new allocation.

1.28.0 ยท sourceยง

impl<'a> From<&'a CString> for Cow<'a, CStr>

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fn from(s: &'a CString) -> Cow<'a, CStr>

Converts a &CString into a borrowed Cow without copying or allocating.

1.18.0 ยท sourceยง

impl From<Box<CStr>> for CString

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fn from(s: Box<CStr>) -> CString

Converts a Box<CStr> into a CString without copying or allocating.

1.24.0 ยท sourceยง

impl From<CString> for Arc<CStr>

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fn from(s: CString) -> Arc<CStr>

Converts a CString into an Arc<CStr> by moving the CString data into a new Arc buffer.

1.20.0 ยท sourceยง

impl From<CString> for Box<CStr>

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fn from(s: CString) -> Box<CStr>

Converts a CString into a Box<CStr> without copying or allocating.

1.28.0 ยท sourceยง

impl<'a> From<CString> for Cow<'a, CStr>

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fn from(s: CString) -> Cow<'a, CStr>

Converts a CString into an owned Cow without copying or allocating.

1.24.0 ยท sourceยง

impl From<CString> for Rc<CStr>

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fn from(s: CString) -> Rc<CStr>

Converts a CString into an Rc<CStr> by moving the CString data into a new Rc buffer.

1.7.0 ยท sourceยง

impl From<CString> for Vec<u8>

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fn from(s: CString) -> Vec<u8> โ“˜

Converts a CString into a Vec<u8>.

The conversion consumes the CString, and removes the terminating NUL byte.

1.28.0 ยท sourceยง

impl<'a> From<Cow<'a, CStr>> for CString

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fn from(s: Cow<'a, CStr>) -> CString

Converts a Cow<'a, CStr> into a CString, by copying the contents if they are borrowed.

1.43.0 ยท sourceยง

impl From<Vec<NonZero<u8>>> for CString

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fn from(v: Vec<NonZero<u8>>) -> CString

Converts a Vec<NonZero<u8>> into a CString without copying nor checking for inner nul bytes.

1.64.0 ยท sourceยง

impl Hash for CString

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fn hash<__H>(&self, state: &mut __H)
where __H: Hasher,

Feeds this value into the given Hasher. Read more
1.3.0 ยท sourceยง

fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
1.7.0 ยท sourceยง

impl Index<RangeFull> for CString

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type Output = CStr

The returned type after indexing.
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fn index(&self, _index: RangeFull) -> &CStr

Performs the indexing (container[index]) operation. Read more
1.64.0 ยท sourceยง

impl Ord for CString

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fn cmp(&self, other: &CString) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 ยท sourceยง

fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 ยท sourceยง

fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 ยท sourceยง

fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
1.64.0 ยท sourceยง

impl PartialEq for CString

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fn eq(&self, other: &CString) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 ยท sourceยง

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.64.0 ยท sourceยง

impl PartialOrd for CString

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fn partial_cmp(&self, other: &CString) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 ยท sourceยง

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
1.0.0 ยท sourceยง

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 ยท sourceยง

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 ยท sourceยง

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
1.64.0 ยท sourceยง

impl Eq for CString

1.64.0 ยท sourceยง

impl StructuralPartialEq for CString

Auto Trait Implementationsยง

Blanket Implementationsยง

sourceยง

impl<T> Any for T
where T: 'static + ?Sized,

sourceยง

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
sourceยง

impl<T> Borrow<T> for T
where T: ?Sized,

sourceยง

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
sourceยง

impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

๐Ÿ”ฌThis is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.