1.0.0[−][src]Trait nom::lib::std::prelude::v1::v1::From
Simple and safe type conversions in to Self
. It is the reciprocal of
Into
.
This trait is useful when performing error handling as described by
the book and is closely related to the ?
operator.
When constructing a function that is capable of failing the return type
will generally be of the form Result<T, E>
.
The From
trait allows for simplification of error handling by providing a
means of returning a single error type that encapsulates numerous possible
erroneous situations.
This trait is not limited to error handling, rather the general case for this trait would be in any type conversions to have an explicit definition of how they are performed.
Note: this trait must not fail. If the conversion can fail, use
TryFrom
or a dedicated method which returns an Option<T>
or a
Result<T, E>
.
Generic Implementations
Examples
String
implements From<&str>
:
let string = "hello".to_string(); let other_string = String::from("hello"); assert_eq!(string, other_string);
An example usage for error handling:
use std::fs; use std::io; use std::num; enum CliError { IoError(io::Error), ParseError(num::ParseIntError), } impl From<io::Error> for CliError { fn from(error: io::Error) -> Self { CliError::IoError(error) } } impl From<num::ParseIntError> for CliError { fn from(error: num::ParseIntError) -> Self { CliError::ParseError(error) } } fn open_and_parse_file(file_name: &str) -> Result<i32, CliError> { let mut contents = fs::read_to_string(&file_name)?; let num: i32 = contents.trim().parse()?; Ok(num) }
Required methods
fn from(T) -> Self
Performs the conversion.
Implementations on Foreign Types
impl<'a> From<&'a Path> for Cow<'a, Path>
[src]
impl From<[u8; 4]> for IpAddr
[src]
fn from(octets: [u8; 4]) -> IpAddr
[src]
Creates an IpAddr::V4
from a four element byte array.
Examples
use std::net::{IpAddr, Ipv4Addr}; let addr = IpAddr::from([13u8, 12u8, 11u8, 10u8]); assert_eq!(IpAddr::V4(Ipv4Addr::new(13, 12, 11, 10)), addr);
impl From<OsString> for Rc<OsStr>
[src]
impl From<ErrorKind> for Error
[src]
Intended for use for errors not exposed to the user, where allocating onto the heap (for normal construction via Error::new) is too costly.
impl From<String> for OsString
[src]
fn from(s: String) -> OsString
[src]
Converts a String
into a [OsString
].
The conversion copies the data, and includes an allocation on the heap.
impl<'a, T> From<&'a T> for PathBuf where
T: AsRef<OsStr> + ?Sized,
[src]
T: AsRef<OsStr> + ?Sized,
impl<T> From<T> for RwLock<T>
[src]
fn from(t: T) -> RwLock<T>
[src]
Creates a new instance of an RwLock<T>
which is unlocked.
This is equivalent to [RwLock::new
].
impl<'a, T> From<&'a T> for OsString where
T: AsRef<OsStr> + ?Sized,
[src]
T: AsRef<OsStr> + ?Sized,
impl From<SocketAddrV4> for SocketAddr
[src]
fn from(sock4: SocketAddrV4) -> SocketAddr
[src]
Converts a [SocketAddrV4
] into a [SocketAddr::V4
].
impl From<Ipv6Addr> for u128
[src]
fn from(ip: Ipv6Addr) -> u128
[src]
Convert an Ipv6Addr
into a host byte order u128
.
Examples
use std::net::Ipv6Addr; let addr = Ipv6Addr::new( 0x1020, 0x3040, 0x5060, 0x7080, 0x90A0, 0xB0C0, 0xD0E0, 0xF00D, ); assert_eq!(0x102030405060708090A0B0C0D0E0F00D_u128, u128::from(addr));
impl<'a> From<&'a PathBuf> for Cow<'a, Path>
[src]
impl From<Ipv4Addr> for u32
[src]
fn from(ip: Ipv4Addr) -> u32
[src]
Converts an Ipv4Addr
into a host byte order u32
.
Examples
use std::net::Ipv4Addr; let addr = Ipv4Addr::new(13, 12, 11, 10); assert_eq!(0x0d0c0b0au32, u32::from(addr));
impl<'a> From<Cow<'a, CStr>> for CString
[src]
impl From<[u16; 8]> for IpAddr
[src]
fn from(segments: [u16; 8]) -> IpAddr
[src]
Creates an IpAddr::V6
from an eight element 16-bit array.
Examples
use std::net::{IpAddr, Ipv6Addr}; let addr = IpAddr::from([ 525u16, 524u16, 523u16, 522u16, 521u16, 520u16, 519u16, 518u16, ]); assert_eq!( IpAddr::V6(Ipv6Addr::new( 0x20d, 0x20c, 0x20b, 0x20a, 0x209, 0x208, 0x207, 0x206 )), addr );
impl From<u32> for Ipv4Addr
[src]
fn from(ip: u32) -> Ipv4Addr
[src]
Converts a host byte order u32
into an Ipv4Addr
.
Examples
use std::net::Ipv4Addr; let addr = Ipv4Addr::from(0x0d0c0b0au32); assert_eq!(Ipv4Addr::new(13, 12, 11, 10), addr);
impl<I> From<(I, u16)> for SocketAddr where
I: Into<IpAddr>,
[src]
I: Into<IpAddr>,
fn from(pieces: (I, u16)) -> SocketAddr
[src]
Converts a tuple struct (Into<[IpAddr
]>, u16
) into a [SocketAddr
].
This conversion creates a [SocketAddr::V4
] for a [IpAddr::V4
]
and creates a [SocketAddr::V6
] for a [IpAddr::V6
].
u16
is treated as port of the newly created [SocketAddr
].
impl<'a> From<CString> for Cow<'a, CStr>
[src]
impl<W> From<IntoInnerError<W>> for Error
[src]
fn from(iie: IntoInnerError<W>) -> Error
[src]
impl<'a> From<&'a OsStr> for Rc<OsStr>
[src]
impl From<ChildStdin> for Stdio
[src]
fn from(child: ChildStdin) -> Stdio
[src]
Converts a ChildStdin
into a Stdio
Examples
ChildStdin
will be converted to Stdio
using Stdio::from
under the hood.
use std::process::{Command, Stdio}; let reverse = Command::new("rev") .stdin(Stdio::piped()) .spawn() .expect("failed reverse command"); let _echo = Command::new("echo") .arg("Hello, world!") .stdout(reverse.stdin.unwrap()) // Converted into a Stdio here .output() .expect("failed echo command"); // "!dlrow ,olleH" echoed to console
impl From<PathBuf> for Rc<Path>
[src]
fn from(s: PathBuf) -> Rc<Path>
[src]
Converts a Path into a Rc by copying the Path data into a new Rc buffer.
impl From<[u8; 16]> for IpAddr
[src]
fn from(octets: [u8; 16]) -> IpAddr
[src]
Creates an IpAddr::V6
from a sixteen element byte array.
Examples
use std::net::{IpAddr, Ipv6Addr}; let addr = IpAddr::from([ 25u8, 24u8, 23u8, 22u8, 21u8, 20u8, 19u8, 18u8, 17u8, 16u8, 15u8, 14u8, 13u8, 12u8, 11u8, 10u8, ]); assert_eq!( IpAddr::V6(Ipv6Addr::new( 0x1918, 0x1716, 0x1514, 0x1312, 0x1110, 0x0f0e, 0x0d0c, 0x0b0a )), addr );
impl<T> From<SendError<T>> for TrySendError<T>
[src]
fn from(err: SendError<T>) -> TrySendError<T>
[src]
impl From<OsString> for Arc<OsStr>
[src]
impl From<u128> for Ipv6Addr
[src]
fn from(ip: u128) -> Ipv6Addr
[src]
Convert a host byte order u128
into an Ipv6Addr
.
Examples
use std::net::Ipv6Addr; let addr = Ipv6Addr::from(0x102030405060708090A0B0C0D0E0F00D_u128); assert_eq!( Ipv6Addr::new( 0x1020, 0x3040, 0x5060, 0x7080, 0x90A0, 0xB0C0, 0xD0E0, 0xF00D, ), addr);
impl From<Box<CStr>> for CString
[src]
impl<'a> From<&'a Path> for Arc<Path>
[src]
fn from(s: &Path) -> Arc<Path>
[src]
Converts a Path into a Rc by copying the Path data into a new Rc buffer.
impl<'a> From<Cow<'a, Path>> for PathBuf
[src]
impl From<PathBuf> for OsString
[src]
fn from(path_buf: PathBuf) -> OsString
[src]
Converts a PathBuf
into a OsString
This conversion does not allocate or copy memory.
impl<'a> From<&'a OsStr> for Arc<OsStr>
[src]
impl From<DefaultEnvKey> for OsString
[src]
impl From<SocketAddrV6> for SocketAddr
[src]
fn from(sock6: SocketAddrV6) -> SocketAddr
[src]
Converts a [SocketAddrV6
] into a [SocketAddr::V6
].
impl From<NulError> for Error
[src]
impl From<Box<Path>> for PathBuf
[src]
fn from(boxed: Box<Path>) -> PathBuf
[src]
Converts a Box<Path>
into a PathBuf
This conversion does not allocate or copy memory.
impl From<Ipv6Addr> for IpAddr
[src]
impl<'a> From<&'a CStr> for CString
[src]
impl<'a> From<OsString> for Cow<'a, OsStr>
[src]
impl<'a> From<&'a CStr> for Rc<CStr>
[src]
impl From<ChildStderr> for Stdio
[src]
fn from(child: ChildStderr) -> Stdio
[src]
Converts a ChildStderr
into a Stdio
Examples
use std::process::{Command, Stdio}; let reverse = Command::new("rev") .arg("non_existing_file.txt") .stderr(Stdio::piped()) .spawn() .expect("failed reverse command"); let cat = Command::new("cat") .arg("-") .stdin(reverse.stderr.unwrap()) // Converted into a Stdio here .output() .expect("failed echo command"); assert_eq!( String::from_utf8_lossy(&cat.stdout), "rev: cannot open non_existing_file.txt: No such file or directory\n" );
impl<'a> From<&'a OsString> for Cow<'a, OsStr>
[src]
impl<'a> From<PathBuf> for Cow<'a, Path>
[src]
impl From<CString> for Rc<CStr>
[src]
impl From<RecvError> for RecvTimeoutError
[src]
fn from(err: RecvError) -> RecvTimeoutError
[src]
impl From<[u8; 4]> for Ipv4Addr
[src]
fn from(octets: [u8; 4]) -> Ipv4Addr
[src]
Examples
use std::net::Ipv4Addr; let addr = Ipv4Addr::from([13u8, 12u8, 11u8, 10u8]); assert_eq!(Ipv4Addr::new(13, 12, 11, 10), addr);
impl From<RecvError> for TryRecvError
[src]
fn from(err: RecvError) -> TryRecvError
[src]
impl From<[u8; 16]> for Ipv6Addr
[src]
impl<'a> From<&'a CString> for Cow<'a, CStr>
[src]
impl From<CString> for Arc<CStr>
[src]
impl From<String> for PathBuf
[src]
fn from(s: String) -> PathBuf
[src]
Converts a String
into a PathBuf
This conversion does not allocate or copy memory.
impl From<[u16; 8]> for Ipv6Addr
[src]
impl From<OsString> for PathBuf
[src]
fn from(s: OsString) -> PathBuf
[src]
Converts a OsString
into a PathBuf
This conversion does not allocate or copy memory.
impl From<ChildStdout> for Stdio
[src]
fn from(child: ChildStdout) -> Stdio
[src]
Converts a ChildStdout
into a Stdio
Examples
ChildStdout
will be converted to Stdio
using Stdio::from
under the hood.
use std::process::{Command, Stdio}; let hello = Command::new("echo") .arg("Hello, world!") .stdout(Stdio::piped()) .spawn() .expect("failed echo command"); let reverse = Command::new("rev") .stdin(hello.stdout.unwrap()) // Converted into a Stdio here .output() .expect("failed reverse command"); assert_eq!(reverse.stdout, b"!dlrow ,olleH\n");
impl From<Box<OsStr>> for OsString
[src]
fn from(boxed: Box<OsStr>) -> OsString
[src]
Converts a Box<OsStr>
into a OsString
without copying or allocating.
impl<'a> From<&'a OsStr> for Cow<'a, OsStr>
[src]
impl From<Ipv4Addr> for IpAddr
[src]
impl<'a> From<&'a CStr> for Arc<CStr>
[src]
impl<'a> From<&'a CStr> for Cow<'a, CStr>
[src]
impl<T> From<T> for Mutex<T>
[src]
fn from(t: T) -> Mutex<T>
[src]
Creates a new mutex in an unlocked state ready for use.
This is equivalent to [Mutex::new
].
impl<'a> From<&'a Path> for Rc<Path>
[src]
fn from(s: &Path) -> Rc<Path>
[src]
Converts a Path into a Rc by copying the Path data into a new Rc buffer.
impl<T> From<PoisonError<T>> for TryLockError<T>
[src]
fn from(err: PoisonError<T>) -> TryLockError<T>
[src]
impl From<File> for Stdio
[src]
fn from(file: File) -> Stdio
[src]
Converts a File
into a Stdio
Examples
File
will be converted to Stdio
using Stdio::from
under the hood.
use std::fs::File; use std::process::Command; // With the `foo.txt` file containing `Hello, world!" let file = File::open("foo.txt").unwrap(); let reverse = Command::new("rev") .stdin(file) // Implicit File conversion into a Stdio .output() .expect("failed reverse command"); assert_eq!(reverse.stdout, b"!dlrow ,olleH");
impl<'a> From<Cow<'a, OsStr>> for OsString
[src]
impl From<PathBuf> for Arc<Path>
[src]
fn from(s: PathBuf) -> Arc<Path>
[src]
Converts a Path into a Rc by copying the Path data into a new Rc buffer.
impl From<bool> for u32
[src]
Converts a bool
to a u32
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(u32::from(true), 1); assert_eq!(u32::from(false), 0);
impl<T> From<T> for Poll<T>
[src]
impl From<bool> for u64
[src]
Converts a bool
to a u64
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(u64::from(true), 1); assert_eq!(u64::from(false), 0);
impl From<i64> for i128
[src]
Converts i64
to i128
losslessly.
impl From<bool> for i8
[src]
Converts a bool
to a i8
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(i8::from(true), 1); assert_eq!(i8::from(false), 0);
impl From<i64> for AtomicI64
[src]
impl<T> From<T> for RefCell<T>
[src]
impl From<NonZeroUsize> for usize
[src]
fn from(nonzero: NonZeroUsize) -> usize
[src]
impl From<NonZeroI128> for i128
[src]
fn from(nonzero: NonZeroI128) -> i128
[src]
impl From<u64> for u128
[src]
Converts u64
to u128
losslessly.
impl From<bool> for u128
[src]
Converts a bool
to a u128
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(u128::from(true), 1); assert_eq!(u128::from(false), 0);
impl From<NonZeroU32> for u32
[src]
fn from(nonzero: NonZeroU32) -> u32
[src]
impl From<u8> for i64
[src]
Converts u8
to i64
losslessly.
impl From<NonZeroI8> for i8
[src]
impl From<NonZeroU8> for u8
[src]
impl From<u32> for u128
[src]
Converts u32
to u128
losslessly.
impl From<u16> for f32
[src]
Converts u16
to f32
losslessly.
impl From<bool> for u8
[src]
Converts a bool
to a u8
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(u8::from(true), 1); assert_eq!(u8::from(false), 0);
impl From<NonZeroI32> for i32
[src]
fn from(nonzero: NonZeroI32) -> i32
[src]
impl From<u8> for f32
[src]
Converts u8
to f32
losslessly.
impl From<u64> for i128
[src]
Converts u64
to i128
losslessly.
impl From<u8> for i16
[src]
Converts u8
to i16
losslessly.
impl<T> From<T> for UnsafeCell<T>
[src]
fn from(t: T) -> UnsafeCell<T>
[src]
impl From<isize> for AtomicIsize
[src]
fn from(v: isize) -> AtomicIsize
[src]
Converts an isize
into an AtomicIsize
.
impl From<i16> for i64
[src]
Converts i16
to i64
losslessly.
impl From<u8> for f64
[src]
Converts u8
to f64
losslessly.
impl From<NonZeroU16> for u16
[src]
fn from(nonzero: NonZeroU16) -> u16
[src]
impl From<bool> for i128
[src]
Converts a bool
to a i128
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(i128::from(true), 1); assert_eq!(i128::from(false), 0);
impl From<NonZeroI64> for i64
[src]
fn from(nonzero: NonZeroI64) -> i64
[src]
impl From<!> for TryFromIntError
[src]
fn from(never: !) -> TryFromIntError
[src]
impl From<usize> for AtomicUsize
[src]
fn from(v: usize) -> AtomicUsize
[src]
Converts an usize
into an AtomicUsize
.
impl From<i8> for i32
[src]
Converts i8
to i32
losslessly.
impl From<u8> for u16
[src]
Converts u8
to u16
losslessly.
impl From<i32> for i128
[src]
Converts i32
to i128
losslessly.
impl From<u16> for i128
[src]
Converts u16
to i128
losslessly.
impl From<i32> for i64
[src]
Converts i32
to i64
losslessly.
impl From<NonZeroU64> for u64
[src]
fn from(nonzero: NonZeroU64) -> u64
[src]
impl From<bool> for i64
[src]
Converts a bool
to a i64
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(i64::from(true), 1); assert_eq!(i64::from(false), 0);
impl From<u32> for AtomicU32
[src]
impl From<bool> for AtomicBool
[src]
fn from(b: bool) -> AtomicBool
[src]
Converts a bool
into an AtomicBool
.
Examples
use std::sync::atomic::AtomicBool; let atomic_bool = AtomicBool::from(true); assert_eq!(format!("{:?}", atomic_bool), "true")
impl From<u16> for i64
[src]
Converts u16
to i64
losslessly.
impl From<i8> for isize
[src]
Converts i8
to isize
losslessly.
impl From<char> for u32
[src]
fn from(c: char) -> u32
[src]
Converts a [char
] into a [u32
].
Examples
use std::mem; fn main() { let c = 'c'; let u = u32::from(c); assert!(4 == mem::size_of_val(&u)) }
impl From<NonZeroU128> for u128
[src]
fn from(nonzero: NonZeroU128) -> u128
[src]
impl From<bool> for u16
[src]
Converts a bool
to a u16
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(u16::from(true), 1); assert_eq!(u16::from(false), 0);
impl From<bool> for i16
[src]
Converts a bool
to a i16
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(i16::from(true), 1); assert_eq!(i16::from(false), 0);
impl From<i8> for f32
[src]
Converts i8
to f32
losslessly.
impl From<bool> for usize
[src]
Converts a bool
to a usize
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(usize::from(true), 1); assert_eq!(usize::from(false), 0);
impl From<i16> for isize
[src]
Converts i16
to isize
losslessly.
impl From<i32> for f64
[src]
Converts i32
to f64
losslessly.
impl<T> From<Unique<T>> for NonNull<T> where
T: ?Sized,
[src]
T: ?Sized,
impl From<bool> for i32
[src]
Converts a bool
to a i32
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(i32::from(true), 1); assert_eq!(i32::from(false), 0);
impl<T> From<T> for Cell<T>
[src]
impl From<u16> for u128
[src]
Converts u16
to u128
losslessly.
impl From<u8> for i32
[src]
Converts u8
to i32
losslessly.
impl<'a, T> From<&'a mut T> for NonNull<T> where
T: ?Sized,
[src]
T: ?Sized,
impl From<i8> for f64
[src]
Converts i8
to f64
losslessly.
impl From<u64> for AtomicU64
[src]
impl From<u8> for i128
[src]
Converts u8
to i128
losslessly.
impl From<u32> for f64
[src]
Converts u32
to f64
losslessly.
impl From<i16> for i128
[src]
Converts i16
to i128
losslessly.
impl From<Infallible> for TryFromIntError
[src]
fn from(x: Infallible) -> TryFromIntError
[src]
impl<T> From<*mut T> for AtomicPtr<T>
[src]
impl From<i32> for AtomicI32
[src]
impl From<u16> for usize
[src]
Converts u16
to usize
losslessly.
impl From<u32> for u64
[src]
Converts u32
to u64
losslessly.
impl From<u16> for u64
[src]
Converts u16
to u64
losslessly.
impl From<u32> for i64
[src]
Converts u32
to i64
losslessly.
impl From<u16> for f64
[src]
Converts u16
to f64
losslessly.
impl From<i8> for i64
[src]
Converts i8
to i64
losslessly.
impl From<u16> for AtomicU16
[src]
impl From<i16> for f64
[src]
Converts i16
to f64
losslessly.
impl From<i16> for f32
[src]
Converts i16
to f32
losslessly.
impl From<f32> for f64
[src]
Converts f32
to f64
losslessly.
impl From<u32> for i128
[src]
Converts u32
to i128
losslessly.
impl From<NonZeroIsize> for isize
[src]
fn from(nonzero: NonZeroIsize) -> isize
[src]
impl From<u8> for u64
[src]
Converts u8
to u64
losslessly.
impl From<i16> for i32
[src]
Converts i16
to i32
losslessly.
impl From<u8> for usize
[src]
Converts u8
to usize
losslessly.
impl From<u8> for AtomicU8
[src]
impl From<i8> for i16
[src]
Converts i8
to i16
losslessly.
impl From<u8> for isize
[src]
Converts u8
to isize
losslessly.
impl From<u8> for char
[src]
Maps a byte in 0x00...0xFF to a char
whose code point has the same value, in U+0000 to U+00FF.
Unicode is designed such that this effectively decodes bytes with the character encoding that IANA calls ISO-8859-1. This encoding is compatible with ASCII.
Note that this is different from ISO/IEC 8859-1 a.k.a. ISO 8859-1 (with one less hyphen), which leaves some "blanks", byte values that are not assigned to any character. ISO-8859-1 (the IANA one) assigns them to the C0 and C1 control codes.
Note that this is also different from Windows-1252 a.k.a. code page 1252, which is a superset ISO/IEC 8859-1 that assigns some (not all!) blanks to punctuation and various Latin characters.
To confuse things further, on the Web
ascii
, iso-8859-1
, and windows-1252
are all aliases
for a superset of Windows-1252 that fills the remaining blanks with corresponding
C0 and C1 control codes.
impl From<u8> for u128
[src]
Converts u8
to u128
losslessly.
impl<'a, T> From<&'a T> for NonNull<T> where
T: ?Sized,
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T: ?Sized,
impl From<i8> for i128
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Converts i8
to i128
losslessly.
impl From<bool> for isize
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Converts a bool
to a isize
. The resulting value is 0
for false
and 1
for true
values.
Examples
assert_eq!(isize::from(true), 1); assert_eq!(isize::from(false), 0);
impl From<i8> for AtomicI8
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impl From<u16> for u32
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Converts u16
to u32
losslessly.
impl From<NonZeroI16> for i16
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fn from(nonzero: NonZeroI16) -> i16
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impl From<u8> for u32
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Converts u8
to u32
losslessly.
impl From<u16> for i32
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Converts u16
to i32
losslessly.
impl From<i16> for AtomicI16
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impl<T> From<Vec<T>> for Rc<[T]>
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impl<'_> From<&'_ str> for Arc<str>
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impl<'a, T> From<Vec<T>> for Cow<'a, [T]> where
T: Clone,
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T: Clone,
impl<T> From<Vec<T>> for Arc<[T]>
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impl<T> From<T> for Rc<T>
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impl<T> From<Box<T>> for Rc<T> where
T: ?Sized,
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T: ?Sized,
impl<T> From<Box<T>> for Pin<Box<T>> where
T: ?Sized,
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T: ?Sized,
fn from(boxed: Box<T>) -> Pin<Box<T>>
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Converts a Box<T>
into a Pin<Box<T>>
This conversion does not allocate on the heap and happens in place.
impl<'a, T> From<&'a [T]> for Rc<[T]> where
T: Clone,
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T: Clone,
impl<'a> From<&'a String> for Cow<'a, str>
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impl<T> From<T> for Arc<T>
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impl<'a> From<&'a str> for Rc<str>
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impl<'a, T> From<&'a [T]> for Cow<'a, [T]> where
T: Clone,
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T: Clone,
impl From<String> for Rc<str>
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impl<'a, T> From<&'a Vec<T>> for Cow<'a, [T]> where
T: Clone,
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T: Clone,
impl<'_, T> From<&'_ [T]> for Arc<[T]> where
T: Clone,
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T: Clone,
impl From<String> for Arc<str>
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impl<'a> From<String> for Cow<'a, str>
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impl<'a> From<&'a str> for Cow<'a, str>
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impl<T> From<Box<T>> for Arc<T> where
T: ?Sized,
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T: ?Sized,
impl<'t> From<Match<'t>> for &'t str
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impl From<Error> for Error
fn from(err: Error) -> Error
impl From<Error> for Error
fn from(err: Error) -> Error
Implementors
impl From<!> for Infallible
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fn from(x: !) -> Infallible
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impl From<AllocErr> for CollectionAllocErr
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fn from(AllocErr) -> CollectionAllocErr
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impl From<LayoutErr> for CollectionAllocErr
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fn from(LayoutErr) -> CollectionAllocErr
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impl From<Box<str>> for Box<[u8]>
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ⓘImportant traits for Box<R>fn from(s: Box<str>) -> Box<[u8]>
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Converts a Box<str>>
into a Box<[u8]>
This conversion does not allocate on the heap and happens in place.
Examples
// create a Box<str> which will be used to create a Box<[u8]> let boxed: Box<str> = Box::from("hello"); let boxed_str: Box<[u8]> = Box::from(boxed); // create a &[u8] which will be used to create a Box<[u8]> let slice: &[u8] = &[104, 101, 108, 108, 111]; let boxed_slice = Box::from(slice); assert_eq!(boxed_slice, boxed_str);
impl From<Box<str>> for String
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fn from(s: Box<str>) -> String
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Converts the given boxed str
slice to a String
.
It is notable that the str
slice is owned.
Examples
Basic usage:
let s1: String = String::from("hello world"); let s2: Box<str> = s1.into_boxed_str(); let s3: String = String::from(s2); assert_eq!("hello world", s3)
impl From<String> for Box<dyn Error + 'static>
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impl From<String> for Box<str>
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ⓘImportant traits for Box<R>fn from(s: String) -> Box<str>
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Converts the given String
to a boxed str
slice that is owned.
Examples
Basic usage:
let s1: String = String::from("hello world"); let s2: Box<str> = Box::from(s1); let s3: String = String::from(s2); assert_eq!("hello world", s3)
impl From<String> for Box<dyn Error + 'static + Send + Sync>
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ⓘImportant traits for Box<R>fn from(err: String) -> Box<dyn Error + 'static + Send + Sync>
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Converts a String
into a box of dyn [Error
] + Send
+ Sync
.
Examples
use std::error::Error; use std::mem; let a_string_error = "a string error".to_string(); let a_boxed_error = Box::<Error + Send + Sync>::from(a_string_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))
impl From<String> for Vec<u8>
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fn from(string: String) -> Vec<u8>
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Converts the given String
to a vector Vec
that holds values of type u8
.
Examples
Basic usage:
let s1 = String::from("hello world"); let v1 = Vec::from(s1); for b in v1 { println!("{}", b); }
impl From<CString> for Box<CStr>
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impl From<CString> for Vec<u8>
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impl From<OsString> for Box<OsStr>
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impl From<PathBuf> for Box<Path>
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ⓘImportant traits for Box<R>fn from(p: PathBuf) -> Box<Path>
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Converts a PathBuf
into a Box<Path>
This conversion currently should not allocate memory, but this behavior is not guaranteed on all platforms or in all future versions.
impl<'a> From<&'a str> for CompleteStr<'a>
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impl<'a> From<&'a str> for Box<dyn Error + 'static>
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ⓘImportant traits for Box<R>fn from(err: &'a str) -> Box<dyn Error + 'static>
[src]
Converts a [str
] into a box of dyn [Error
].
Examples
use std::error::Error; use std::mem; let a_str_error = "a str error"; let a_boxed_error = Box::<Error>::from(a_str_error); assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))
impl<'a> From<&'a str> for Box<str>
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ⓘImportant traits for Box<R>fn from(s: &'a str) -> Box<str>
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Converts a &str
into a Box<str>
This conversion allocates on the heap
and performs a copy of s
.
Examples
let boxed: Box<str> = Box::from("hello"); println!("{}", boxed);
impl<'a> From<&'a str> for String
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impl<'a> From<&'a str> for Vec<u8>
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impl<'a> From<&'a CStr> for Box<CStr>
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impl<'a> From<&'a OsStr> for Box<OsStr>
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impl<'a> From<&'a Path> for Box<Path>
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impl<'a> From<Cow<'a, str>> for Box<dyn Error + 'static>
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ⓘImportant traits for Box<R>fn from(err: Cow<'a, str>) -> Box<dyn Error + 'static>
[src]
Converts a [Cow
] into a box of dyn [Error
].
Examples
use std::error::Error; use std::mem; use std::borrow::Cow; let a_cow_str_error = Cow::from("a str error"); let a_boxed_error = Box::<Error>::from(a_cow_str_error); assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))
impl<'a> From<Cow<'a, str>> for String
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impl<'a> From<&'a [u8]> for CompleteByteSlice<'a>
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impl<'a, 'b> From<&'b &'a str> for CompleteStr<'a>
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impl<'a, 'b> From<&'b &'a [u8]> for CompleteByteSlice<'a>
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impl<'a, 'b> From<&'b str> for Box<dyn Error + 'a + Send + Sync>
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impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + 'a + Send + Sync>
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ⓘImportant traits for Box<R>fn from(err: Cow<'b, str>) -> Box<dyn Error + 'a + Send + Sync>
[src]
Converts a [Cow
] into a box of dyn [Error
] + Send
+ Sync
.
Examples
use std::error::Error; use std::mem; use std::borrow::Cow; let a_cow_str_error = Cow::from("a str error"); let a_boxed_error = Box::<Error + Send + Sync>::from(a_cow_str_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))
impl<'a, E> From<E> for Box<dyn Error + 'a> where
E: 'a + Error,
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E: 'a + Error,
ⓘImportant traits for Box<R>fn from(err: E) -> Box<dyn Error + 'a>
[src]
Converts a type of [Error
] into a box of dyn [Error
].
Examples
use std::error::Error; use std::fmt; use std::mem; #[derive(Debug)] struct AnError; impl fmt::Display for AnError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f , "An error") } } impl Error for AnError { fn description(&self) -> &str { "Description of an error" } } let an_error = AnError; assert!(0 == mem::size_of_val(&an_error)); let a_boxed_error = Box::<Error>::from(an_error); assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))
impl<'a, E> From<E> for Box<dyn Error + 'a + Send + Sync> where
E: 'a + Error + Send + Sync,
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E: 'a + Error + Send + Sync,
ⓘImportant traits for Box<R>fn from(err: E) -> Box<dyn Error + 'a + Send + Sync>
[src]
Converts a type of [Error
] + Send
+ Sync
into a box of dyn [Error
] +
Send
+ Sync
.
Examples
use std::error::Error; use std::fmt; use std::mem; #[derive(Debug)] struct AnError; impl fmt::Display for AnError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f , "An error") } } impl Error for AnError { fn description(&self) -> &str { "Description of an error" } } unsafe impl Send for AnError {} unsafe impl Sync for AnError {} let an_error = AnError; assert!(0 == mem::size_of_val(&an_error)); let a_boxed_error = Box::<Error + Send + Sync>::from(an_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))
impl<'a, T> From<&'a Option<T>> for Option<&'a T>
[src]
impl<'a, T> From<&'a mut Option<T>> for Option<&'a mut T>
[src]
impl<'a, T> From<Cow<'a, [T]>> for Vec<T> where
[T]: ToOwned,
<[T] as ToOwned>::Owned == Vec<T>,
[src]
[T]: ToOwned,
<[T] as ToOwned>::Owned == Vec<T>,
impl<'a, T> From<&'a [T]> for Box<[T]> where
T: Copy,
[src]
T: Copy,
ⓘImportant traits for Box<R>fn from(slice: &'a [T]) -> Box<[T]>
[src]
Converts a &[T]
into a Box<[T]>
This conversion allocates on the heap
and performs a copy of slice
.
Examples
// create a &[u8] which will be used to create a Box<[u8]> let slice: &[u8] = &[104, 101, 108, 108, 111]; let boxed_slice: Box<[u8]> = Box::from(slice); println!("{:?}", boxed_slice);
impl<'a, T> From<&'a [T]> for Vec<T> where
T: Clone,
[src]
T: Clone,
impl<'a, T> From<&'a mut [T]> for Vec<T> where
T: Clone,
[src]
T: Clone,
impl<T> From<T> for T
[src]
impl<T> From<BinaryHeap<T>> for Vec<T>
[src]
impl<T> From<VecDeque<T>> for Vec<T>
[src]
impl<T> From<Box<[T]>> for Vec<T>
[src]
impl<T> From<Vec<T>> for VecDeque<T>
[src]
impl<T> From<Vec<T>> for BinaryHeap<T> where
T: Ord,
[src]
T: Ord,