1.0.0[−][src]Trait boolean_enums::lstd::prelude::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 From<Ipv4Addr> for u32
[src]
impl From<Ipv4Addr> for u32
fn from(ip: Ipv4Addr) -> u32 | [src] |
Convert 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 From<Ipv6Addr> for u128
[src]
impl From<Ipv6Addr> for u128
impl From<NonZeroU16> for u16
[src]
impl From<NonZeroU16> for u16
fn from(nonzero: NonZeroU16) -> u16 | [src] |
impl From<u8> for usize
[src]
impl From<u8> for usize
Converts u8
to usize
losslessly.
impl From<i16> for i32
[src]
impl From<i16> for i32
Converts i16
to i32
losslessly.
impl From<i32> for f64
[src]
impl From<i32> for f64
Converts i32
to f64
losslessly.
impl From<u8> for u128
[src]
impl From<u8> for u128
Converts u8
to u128
losslessly.
impl From<NonZeroU128> for u128
[src]
impl From<NonZeroU128> for u128
fn from(nonzero: NonZeroU128) -> u128 | [src] |
impl From<i32> for i64
[src]
impl From<i32> for i64
Converts i32
to i64
losslessly.
impl From<i16> for f64
[src]
impl From<i16> for f64
Converts i16
to f64
losslessly.
impl From<bool> for isize
[src]
impl From<bool> for isize
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<NonZeroU8> for u8
[src]
impl From<NonZeroU8> for u8
impl From<u8> for i64
[src]
impl From<u8> for i64
Converts u8
to i64
losslessly.
impl From<i8> for isize
[src]
impl From<i8> for isize
Converts i8
to isize
losslessly.
impl From<i16> for i128
[src]
impl From<i16> for i128
Converts i16
to i128
losslessly.
impl From<u64> for u128
[src]
impl From<u64> for u128
Converts u64
to u128
losslessly.
impl From<u32> for i64
[src]
impl From<u32> for i64
Converts u32
to i64
losslessly.
impl From<bool> for usize
[src]
impl From<bool> for usize
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<bool> for i16
[src]
impl From<bool> for i16
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 i64
[src]
impl From<i8> for i64
Converts i8
to i64
losslessly.
impl From<u8> for i32
[src]
impl From<u8> for i32
Converts u8
to i32
losslessly.
impl From<char> for u32
[src]
impl From<char> for u32
impl From<i8> for i32
[src]
impl From<i8> for i32
Converts i8
to i32
losslessly.
impl From<u8> for char
[src]
impl From<u8> for char
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<bool> for u32
[src]
impl From<bool> for u32
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 From<u8> for f32
[src]
impl From<u8> for f32
Converts u8
to f32
losslessly.
impl From<u16> for i128
[src]
impl From<u16> for i128
Converts u16
to i128
losslessly.
impl From<i64> for i128
[src]
impl From<i64> for i128
Converts i64
to i128
losslessly.
impl From<u8> for u32
[src]
impl From<u8> for u32
Converts u8
to u32
losslessly.
impl From<u16> for usize
[src]
impl From<u16> for usize
Converts u16
to usize
losslessly.
impl From<i8> for f64
[src]
impl From<i8> for f64
Converts i8
to f64
losslessly.
impl From<u16> for u64
[src]
impl From<u16> for u64
Converts u16
to u64
losslessly.
impl From<u8> for f64
[src]
impl From<u8> for f64
Converts u8
to f64
losslessly.
impl From<NonZeroU64> for u64
[src]
impl From<NonZeroU64> for u64
fn from(nonzero: NonZeroU64) -> u64 | [src] |
impl From<bool> for u128
[src]
impl From<bool> for u128
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<u32> for u64
[src]
impl From<u32> for u64
Converts u32
to u64
losslessly.
impl From<bool> for i128
[src]
impl From<bool> for i128
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<u8> for u64
[src]
impl From<u8> for u64
Converts u8
to u64
losslessly.
impl From<f32> for f64
[src]
impl From<f32> for f64
Converts f32
to f64
losslessly.
impl From<i32> for i128
[src]
impl From<i32> for i128
Converts i32
to i128
losslessly.
impl From<u16> for i32
[src]
impl From<u16> for i32
Converts u16
to i32
losslessly.
impl From<u64> for i128
[src]
impl From<u64> for i128
Converts u64
to i128
losslessly.
impl From<bool> for u64
[src]
impl From<bool> for u64
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<u32> for i128
[src]
impl From<u32> for i128
Converts u32
to i128
losslessly.
impl From<i16> for i64
[src]
impl From<i16> for i64
Converts i16
to i64
losslessly.
impl From<bool> for u16
[src]
impl From<bool> for u16
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 i32
[src]
impl From<bool> for i32
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 From<u8> for u16
[src]
impl From<u8> for u16
Converts u8
to u16
losslessly.
impl From<bool> for i64
[src]
impl From<bool> for i64
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<u16> for f64
[src]
impl From<u16> for f64
Converts u16
to f64
losslessly.
impl From<i8> for i128
[src]
impl From<i8> for i128
Converts i8
to i128
losslessly.
impl From<bool> for u8
[src]
impl From<bool> for u8
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<NonZeroUsize> for usize
[src]
impl From<NonZeroUsize> for usize
fn from(nonzero: NonZeroUsize) -> usize | [src] |
impl From<u16> for f32
[src]
impl From<u16> for f32
Converts u16
to f32
losslessly.
impl From<u16> for i64
[src]
impl From<u16> for i64
Converts u16
to i64
losslessly.
impl From<u16> for u128
[src]
impl From<u16> for u128
Converts u16
to u128
losslessly.
impl From<i16> for f32
[src]
impl From<i16> for f32
Converts i16
to f32
losslessly.
impl From<u8> for i16
[src]
impl From<u8> for i16
Converts u8
to i16
losslessly.
impl From<i8> for f32
[src]
impl From<i8> for f32
Converts i8
to f32
losslessly.
impl From<bool> for i8
[src]
impl From<bool> for i8
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<u8> for i128
[src]
impl From<u8> for i128
Converts u8
to i128
losslessly.
impl From<NonZeroU32> for u32
[src]
impl From<NonZeroU32> for u32
fn from(nonzero: NonZeroU32) -> u32 | [src] |
impl From<i16> for isize
[src]
impl From<i16> for isize
Converts i16
to isize
losslessly.
impl From<u32> for u128
[src]
impl From<u32> for u128
Converts u32
to u128
losslessly.
impl From<u32> for f64
[src]
impl From<u32> for f64
Converts u32
to f64
losslessly.
impl From<u8> for isize
[src]
impl From<u8> for isize
Converts u8
to isize
losslessly.
impl From<u16> for u32
[src]
impl From<u16> for u32
Converts u16
to u32
losslessly.
impl From<i8> for i16
[src]
impl From<i8> for i16
Converts i8
to i16
losslessly.
Implementors
impl From<RecvError> for RecvTimeoutError
[src]
impl From<RecvError> for RecvTimeoutError
fn from(err: RecvError) -> RecvTimeoutError | [src] |
impl From<CString> for Rc<CStr>
[src]
impl From<CString> for Rc<CStr>
impl From<OsString> for Rc<OsStr>
[src]
impl From<OsString> for Rc<OsStr>
impl From<NulError> for Error
[src]
impl From<NulError> for Error
impl From<RecvError> for TryRecvError
[src]
impl From<RecvError> for TryRecvError
fn from(err: RecvError) -> TryRecvError | [src] |
impl From<DefaultEnvKey> for OsString
[src]
impl From<DefaultEnvKey> for OsString
impl From<PathBuf> for OsString
[src]
impl From<PathBuf> for OsString
fn from(path_buf: PathBuf) -> OsString | [src] |
Converts a PathBuf
into a OsString
This conversion does not allocate or copy memory.
impl From<OsString> for Arc<OsStr>
[src]
impl From<OsString> for Arc<OsStr>
impl From<PathBuf> for Rc<Path>
[src]
impl From<PathBuf> for Rc<Path>
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<CString> for Arc<CStr>
[src]
impl From<CString> for Arc<CStr>
impl From<ChildStderr> for Stdio
[src]
impl From<ChildStderr> for Stdio
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 From<ChildStdin> for Stdio
[src]
impl From<ChildStdin> for Stdio
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<ErrorKind> for Error
[src]
impl From<ErrorKind> for Error
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<File> for Stdio
[src]
impl From<File> for Stdio
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 From<OsString> for PathBuf
[src]
impl From<OsString> for PathBuf
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]
impl From<ChildStdout> for Stdio
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<PathBuf> for Arc<Path>
[src]
impl From<PathBuf> for Arc<Path>
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<LocalWaker> for Waker
[src]
impl From<LocalWaker> for Waker
fn from(local_waker: LocalWaker) -> Waker | [src] |
Converts a LocalWaker
into a Waker
.
This conversion turns a !Sync
LocalWaker
into a Sync
Waker
, allowing a wakeup
object to be sent to another thread, but giving up its ability to do specialized
thread-local wakeup behavior.
impl From<isize> for AtomicIsize
[src]
impl From<isize> for AtomicIsize
fn from(v: isize) -> AtomicIsize | [src] |
Converts an isize
into an AtomicIsize
.
impl From<usize> for AtomicUsize
[src]
impl From<usize> for AtomicUsize
fn from(v: usize) -> AtomicUsize | [src] |
Converts an usize
into an AtomicUsize
.
impl From<!> for TryFromIntError
[src]
impl From<!> for TryFromIntError
fn from(never: !) -> TryFromIntError | [src] |
impl From<bool> for AtomicBool
[src]
impl From<bool> for AtomicBool
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<AllocErr> for CollectionAllocErr
[src]
impl From<AllocErr> for CollectionAllocErr
fn from(AllocErr) -> CollectionAllocErr | [src] |
impl From<LayoutErr> for CollectionAllocErr
[src]
impl From<LayoutErr> for CollectionAllocErr
fn from(LayoutErr) -> CollectionAllocErr | [src] |
impl From<[u16; 8]> for IpAddr
[src]
impl From<[u16; 8]> for IpAddr
fn from(segments: [u16; 8]) -> IpAddr | [src] |
Create 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<[u16; 8]> for Ipv6Addr
[src]
impl From<[u16; 8]> for Ipv6Addr
impl From<[u8; 4]> for IpAddr
[src]
impl From<[u8; 4]> for IpAddr
fn from(octets: [u8; 4]) -> IpAddr | [src] |
Create 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<[u8; 16]> for IpAddr
[src]
impl From<[u8; 16]> for IpAddr
fn from(octets: [u8; 16]) -> IpAddr | [src] |
Create 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 From<[u8; 16]> for Ipv6Addr
[src]
impl From<[u8; 16]> for Ipv6Addr
impl From<[u8; 4]> for Ipv4Addr
[src]
impl From<[u8; 4]> for Ipv4Addr
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<i16> for AtomicI16
[src]
impl From<i16> for AtomicI16
impl From<i32> for AtomicI32
[src]
impl From<i32> for AtomicI32
impl From<i64> for AtomicI64
[src]
impl From<i64> for AtomicI64
impl From<i8> for AtomicI8
[src]
impl From<i8> for AtomicI8
impl From<u128> for Ipv6Addr
[src]
impl From<u128> for Ipv6Addr
impl From<u16> for AtomicU16
[src]
impl From<u16> for AtomicU16
impl From<u32> for Ipv4Addr
[src]
impl From<u32> for Ipv4Addr
fn from(ip: u32) -> Ipv4Addr | [src] |
Convert 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 From<u32> for AtomicU32
[src]
impl From<u32> for AtomicU32
impl From<u64> for AtomicU64
[src]
impl From<u64> for AtomicU64
impl From<u8> for AtomicU8
[src]
impl From<u8> for AtomicU8
impl From<CString> for Box<CStr>
[src]
impl From<CString> for Box<CStr>
impl From<CString> for Vec<u8>
[src]
impl From<CString> for Vec<u8>
impl From<OsString> for Box<OsStr>
[src]
impl From<OsString> for Box<OsStr>
impl From<Ipv4Addr> for IpAddr
[src]
impl From<Ipv4Addr> for IpAddr
impl From<Ipv6Addr> for IpAddr
[src]
impl From<Ipv6Addr> for IpAddr
impl From<SocketAddrV4> for SocketAddr
[src]
impl From<SocketAddrV4> for SocketAddr
fn from(sock4: SocketAddrV4) -> SocketAddr | [src] |
Converts a [SocketAddrV4
] into a [SocketAddr::V4
].
impl From<SocketAddrV6> for SocketAddr
[src]
impl From<SocketAddrV6> for SocketAddr
fn from(sock6: SocketAddrV6) -> SocketAddr | [src] |
Converts a [SocketAddrV6
] into a [SocketAddr::V6
].
impl From<PathBuf> for Box<Path>
[src]
impl From<PathBuf> for Box<Path>
ⓘImportant traits for Box<W>
fn from(p: PathBuf) -> Box<Path> | [src] |
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 From<Box<Path>> for PathBuf
[src]
impl From<Box<Path>> for PathBuf
fn from(boxed: Box<Path>) -> PathBuf | [src] |
Converts a Box<Path>
into a PathBuf
This conversion does not allocate or copy memory.
impl From<Box<CStr>> for CString
[src]
impl From<Box<CStr>> for CString
impl From<Box<OsStr>> for OsString
[src]
impl From<Box<OsStr>> for OsString
fn from(boxed: Box<OsStr>) -> OsString | [src] |
Converts a Box<OsStr>
into a OsString
without copying or allocating.
impl From<Box<str>> for Box<[u8]>
[src]
impl From<Box<str>> for Box<[u8]>
ⓘImportant traits for Box<W>
fn from(s: Box<str>) -> Box<[u8]> | [src] |
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
[src]
impl From<Box<str>> for String
fn from(s: Box<str>) -> String | [src] |
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 OsString
[src]
impl From<String> for OsString
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 From<String> for PathBuf
[src]
impl From<String> for PathBuf
fn from(s: String) -> PathBuf | [src] |
Converts a String
into a PathBuf
This conversion does not allocate or copy memory.
impl From<String> for Arc<str>
[src]
impl From<String> for Arc<str>
impl From<String> for Rc<str>
[src]
impl From<String> for Rc<str>
impl From<String> for Box<dyn Error + 'static>
[src]
impl From<String> for Box<dyn Error + 'static>
impl From<String> for Box<str>
[src]
impl From<String> for Box<str>
ⓘImportant traits for Box<W>
fn from(s: String) -> Box<str> | [src] |
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 + Sync + Send>
[src]
impl From<String> for Box<dyn Error + 'static + Sync + Send>
ⓘImportant traits for Box<W>
fn from(err: String) -> Box<dyn Error + 'static + Sync + Send> | [src] |
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>
[src]
impl From<String> for Vec<u8>
fn from(string: String) -> Vec<u8> | [src] |
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<'a> From<&'a OsString> for Cow<'a, OsStr>
[src]
impl<'a> From<&'a OsString> for Cow<'a, OsStr>
impl<'a> From<&'a PathBuf> for Cow<'a, Path>
[src]
impl<'a> From<&'a PathBuf> for Cow<'a, Path>
impl<'a> From<&'a Path> for Rc<Path>
[src]
impl<'a> From<&'a Path> for Rc<Path>
fn from(s: &Path) -> Rc<Path> | [src] |
Converts a Path into a Rc by copying the Path data into a new Rc buffer.
impl<'a> From<&'a OsStr> for Cow<'a, OsStr>
[src]
impl<'a> From<&'a OsStr> for Cow<'a, OsStr>
impl<'a> From<Cow<'a, CStr>> for CString
[src]
impl<'a> From<Cow<'a, CStr>> for CString
impl<'a> From<Cow<'a, Path>> for PathBuf
[src]
impl<'a> From<Cow<'a, Path>> for PathBuf
impl<'a> From<&'a CString> for Cow<'a, CStr>
[src]
impl<'a> From<&'a CString> for Cow<'a, CStr>
impl<'a> From<&'a CStr> for CString
[src]
impl<'a> From<&'a CStr> for CString
impl<'a> From<&'a Path> for Cow<'a, Path>
[src]
impl<'a> From<&'a Path> for Cow<'a, Path>
impl<'a> From<CString> for Cow<'a, CStr>
[src]
impl<'a> From<CString> for Cow<'a, CStr>
impl<'a> From<PathBuf> for Cow<'a, Path>
[src]
impl<'a> From<PathBuf> for Cow<'a, Path>
impl<'a> From<&'a CStr> for Cow<'a, CStr>
[src]
impl<'a> From<&'a CStr> for Cow<'a, CStr>
impl<'a> From<&'a CStr> for Rc<CStr>
[src]
impl<'a> From<&'a CStr> for Rc<CStr>
impl<'a> From<OsString> for Cow<'a, OsStr>
[src]
impl<'a> From<OsString> for Cow<'a, OsStr>
impl<'a> From<Cow<'a, OsStr>> for OsString
[src]
impl<'a> From<Cow<'a, OsStr>> for OsString
impl<'a> From<&'a OsStr> for Arc<OsStr>
[src]
impl<'a> From<&'a OsStr> for Arc<OsStr>
impl<'a> From<&'a OsStr> for Rc<OsStr>
[src]
impl<'a> From<&'a OsStr> for Rc<OsStr>
impl<'a> From<&'a Path> for Arc<Path>
[src]
impl<'a> From<&'a Path> for Arc<Path>
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<&'a CStr> for Arc<CStr>
[src]
impl<'a> From<&'a CStr> for Arc<CStr>
impl<'a> From<&'a str> for Arc<str>
[src]
impl<'a> From<&'a str> for Arc<str>
impl<'a> From<&'a str> for Cow<'a, str>
[src]
impl<'a> From<&'a str> for Cow<'a, str>
impl<'a> From<&'a str> for Rc<str>
[src]
impl<'a> From<&'a str> for Rc<str>
impl<'a> From<&'a str> for Box<dyn Error + 'static>
[src]
impl<'a> From<&'a str> for Box<dyn Error + 'static>
impl<'a> From<&'a str> for Box<str>
[src]
impl<'a> From<&'a str> for Box<str>
ⓘImportant traits for Box<W>
fn from(s: &'a str) -> Box<str> | [src] |
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
[src]
impl<'a> From<&'a str> for String
impl<'a> From<&'a str> for Vec<u8>
[src]
impl<'a> From<&'a str> for Vec<u8>
impl<'a> From<&'a CStr> for Box<CStr>
[src]
impl<'a> From<&'a CStr> for Box<CStr>
impl<'a> From<&'a OsStr> for Box<OsStr>
[src]
impl<'a> From<&'a OsStr> for Box<OsStr>
impl<'a> From<&'a Path> for Box<Path>
[src]
impl<'a> From<&'a Path> for Box<Path>
impl<'a> From<&'a String> for Cow<'a, str>
[src]
impl<'a> From<&'a String> for Cow<'a, str>
impl<'a> From<Cow<'a, str>> for Box<dyn Error + 'static>
[src]
impl<'a> From<Cow<'a, str>> for Box<dyn Error + 'static>
ⓘImportant traits for Box<W>
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
[src]
impl<'a> From<Cow<'a, str>> for String
impl<'a> From<String> for Cow<'a, str>
[src]
impl<'a> From<String> for Cow<'a, str>
impl<'a, 'b> From<&'b str> for Box<dyn Error + 'a + Sync + Send>
[src]
impl<'a, 'b> From<&'b str> for Box<dyn Error + 'a + Sync + Send>
impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + 'a + Sync + Send>
[src]
impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + 'a + Sync + Send>
ⓘImportant traits for Box<W>
fn from(err: Cow<'b, str>) -> Box<dyn Error + 'a + Sync + Send> | [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,
[src]
impl<'a, E> From<E> for Box<dyn Error + 'a> where
E: 'a + Error,
ⓘImportant traits for Box<W>
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 + Sync + Send> where
E: 'a + Error + Send + Sync,
[src]
impl<'a, E> From<E> for Box<dyn Error + 'a + Sync + Send> where
E: 'a + Error + Send + Sync,
ⓘImportant traits for Box<W>
fn from(err: E) -> Box<dyn Error + 'a + Sync + Send> | [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 Option<T>> for Option<&'a T>
impl<'a, T> From<&'a Vec<T>> for Cow<'a, [T]> where
T: Clone,
[src]
impl<'a, T> From<&'a Vec<T>> for Cow<'a, [T]> where
T: Clone,
impl<'a, T> From<&'a mut Option<T>> for Option<&'a mut T>
[src]
impl<'a, T> From<&'a mut Option<T>> for Option<&'a mut T>
impl<'a, T> From<Cow<'a, [T]>> for Vec<T> where
[T]: ToOwned,
<[T] as ToOwned>::Owned == Vec<T>,
[src]
impl<'a, T> From<Cow<'a, [T]>> for Vec<T> where
[T]: ToOwned,
<[T] as ToOwned>::Owned == Vec<T>,
impl<'a, T> From<&'a T> for OsString where
T: AsRef<OsStr> + ?Sized,
[src]
impl<'a, T> From<&'a T> for OsString where
T: AsRef<OsStr> + ?Sized,
impl<'a, T> From<&'a T> for PathBuf where
T: AsRef<OsStr> + ?Sized,
[src]
impl<'a, T> From<&'a T> for PathBuf where
T: AsRef<OsStr> + ?Sized,
impl<'a, T> From<&'a T> for NonNull<T> where
T: ?Sized,
[src]
impl<'a, T> From<&'a T> for NonNull<T> where
T: ?Sized,
impl<'a, T> From<&'a mut T> for NonNull<T> where
T: ?Sized,
[src]
impl<'a, T> From<&'a mut T> for NonNull<T> where
T: ?Sized,
impl<'a, T> From<&'a [T]> for Cow<'a, [T]> where
T: Clone,
[src]
impl<'a, T> From<&'a [T]> for Cow<'a, [T]> where
T: Clone,
impl<'a, T> From<&'a [T]> for Box<[T]> where
T: Copy,
[src]
impl<'a, T> From<&'a [T]> for Box<[T]> where
T: Copy,
ⓘImportant traits for Box<W>
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]
impl<'a, T> From<&'a [T]> for Vec<T> where
T: Clone,
impl<'a, T> From<&'a [T]> for Rc<[T]> where
T: Clone,
[src]
impl<'a, T> From<&'a [T]> for Rc<[T]> where
T: Clone,
impl<'a, T> From<&'a [T]> for Arc<[T]> where
T: Clone,
[src]
impl<'a, T> From<&'a [T]> for Arc<[T]> where
T: Clone,
impl<'a, T> From<&'a mut [T]> for Vec<T> where
T: Clone,
[src]
impl<'a, T> From<&'a mut [T]> for Vec<T> where
T: Clone,
impl<'a, T> From<Vec<T>> for Cow<'a, [T]> where
T: Clone,
[src]
impl<'a, T> From<Vec<T>> for Cow<'a, [T]> where
T: Clone,
impl<I> From<(I, u16)> for SocketAddr where
I: Into<IpAddr>,
[src]
impl<I> From<(I, u16)> for SocketAddr where
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<T> From<T> for RwLock<T>
[src]
impl<T> From<T> for RwLock<T>
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<T> From<T> for Mutex<T>
[src]
impl<T> From<T> for Mutex<T>
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<T> From<SendError<T>> for TrySendError<T>
[src]
impl<T> From<SendError<T>> for TrySendError<T>
fn from(err: SendError<T>) -> TrySendError<T> | [src] |
impl<T> From<PoisonError<T>> for TryLockError<T>
[src]
impl<T> From<PoisonError<T>> for TryLockError<T>
fn from(err: PoisonError<T>) -> TryLockError<T> | [src] |
impl<T> From<T> for RefCell<T>
[src]
impl<T> From<T> for RefCell<T>
impl<T> From<T> for Cell<T>
[src]
impl<T> From<T> for Cell<T>
impl<T> From<T> for Poll<T>
[src]
impl<T> From<T> for Poll<T>
impl<T> From<*mut T> for AtomicPtr<T>
[src]
impl<T> From<*mut T> for AtomicPtr<T>
impl<T> From<T> for T
[src]
impl<T> From<T> for T
impl<T> From<T> for UnsafeCell<T>
[src]
impl<T> From<T> for UnsafeCell<T>
fn from(t: T) -> UnsafeCell<T> | [src] |
impl<T> From<Arc<T>> for Waker where
T: Wake + 'static,
[src]
impl<T> From<Arc<T>> for Waker where
T: Wake + 'static,
impl<T> From<T> for Rc<T>
[src]
impl<T> From<T> for Rc<T>
impl<T> From<T> for Arc<T>
[src]
impl<T> From<T> for Arc<T>
impl<T> From<BinaryHeap<T>> for Vec<T>
[src]
impl<T> From<BinaryHeap<T>> for Vec<T>
impl<T> From<VecDeque<T>> for Vec<T>
[src]
impl<T> From<VecDeque<T>> for Vec<T>
impl<T> From<Box<[T]>> for Vec<T>
[src]
impl<T> From<Box<[T]>> for Vec<T>
impl<T> From<Box<T>> for Pin<Box<T>> where
T: ?Sized,
[src]
impl<T> From<Box<T>> for Pin<Box<T>> where
T: ?Sized,
fn from(boxed: Box<T>) -> Pin<Box<T>> | [src] |
Converts a Box<T>
into a Pin<Box<T>>
This conversion does not allocate on the heap and happens in place.
impl<T> From<Box<T>> for Rc<T> where
T: ?Sized,
[src]
impl<T> From<Box<T>> for Rc<T> where
T: ?Sized,
impl<T> From<Box<T>> for Arc<T> where
T: ?Sized,
[src]
impl<T> From<Box<T>> for Arc<T> where
T: ?Sized,
impl<T> From<Vec<T>> for Rc<[T]>
[src]
impl<T> From<Vec<T>> for Rc<[T]>
impl<T> From<Vec<T>> for VecDeque<T>
[src]
impl<T> From<Vec<T>> for VecDeque<T>
impl<T> From<Vec<T>> for Arc<[T]>
[src]
impl<T> From<Vec<T>> for Arc<[T]>
impl<T> From<Vec<T>> for BinaryHeap<T> where
T: Ord,
[src]
impl<T> From<Vec<T>> for BinaryHeap<T> where
T: Ord,
fn from(vec: Vec<T>) -> BinaryHeap<T> | [src] |
impl<T> From<Vec<T>> for Box<[T]>
[src]
impl<T> From<Vec<T>> for Box<[T]>
impl<T> From<T> for Option<T>
[src]
impl<T> From<T> for Option<T>
impl<T> From<T> for Box<T>
[src]
impl<T> From<T> for Box<T>
ⓘImportant traits for Box<W>
fn from(t: T) -> Box<T> | [src] |
Converts a generic type T
into a Box<T>
The conversion allocates on the heap and moves t
from the stack into it.
Examples
let x = 5; let boxed = Box::new(5); assert_eq!(Box::from(x), boxed);
impl<T> From<Unique<T>> for NonNull<T> where
T: ?Sized,
[src]
impl<T> From<Unique<T>> for NonNull<T> where
T: ?Sized,
impl<W> From<IntoInnerError<W>> for Error
[src]
impl<W> From<IntoInnerError<W>> for Error
fn from(iie: IntoInnerError<W>) -> Error | [src] |