Trait std::convert::From 1.0.0[−][src]
pub trait From<T> {
pub fn from(T) -> Self;
}Used to do value-to-value conversions while consuming the input value. It is the reciprocal of
Into.
One should always prefer implementing From over Into
because implementing From automatically provides one with an implementation of Into
thanks to the blanket implementation in the standard library.
Only implement Into when targeting a version prior to Rust 1.41 and converting to a type
outside the current crate.
From was not able to do these types of conversions in earlier versions because of Rust’s
orphaning rules.
See Into for more details.
Prefer using Into over using From when specifying trait bounds on a generic function.
This way, types that directly implement Into can be used as arguments as well.
The From is also very useful when performing error handling. When constructing a function
that is capable of failing, the return type will generally be of the form Result<T, E>.
The From trait simplifies error handling by allowing a function to return a single error type
that encapsulate multiple error types. See the “Examples” section and the book for more
details.
Note: This trait must not fail. If the conversion can fail, use TryFrom.
Generic Implementations
From<T> for UimpliesInto<U> for TFromis reflexive, which means thatFrom<T> for Tis implemented
Examples
String implements From<&str>:
An explicit conversion from a &str to a String is done as follows:
let string = "hello".to_string(); let other_string = String::from("hello"); assert_eq!(string, other_string);Run
While performing error handling it is often useful to implement From for your own error type.
By converting underlying error types to our own custom error type that encapsulates the
underlying error type, we can return a single error type without losing information on the
underlying cause. The ‘?’ operator automatically converts the underlying error type to our
custom error type by calling Into<CliError>::into which is automatically provided when
implementing From. The compiler then infers which implementation of Into should be used.
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) }Run
Required methods
Loading content...Implementors
impl From<&'_ str> for Box<dyn Error>1.6.0[src]
impl From<&'_ str> for Box<dyn Error>1.6.0[src]fn from(err: &str) -> Box<dyn Error>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<&'_ CStr> for Box<CStr>1.17.0[src]
impl From<&'_ CStr> for Box<CStr>1.17.0[src]fn from(s: &CStr) -> Box<CStr>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<&'_ OsStr> for Box<OsStr>1.17.0[src]
impl From<&'_ OsStr> for Box<OsStr>1.17.0[src]fn from(s: &OsStr) -> Box<OsStr>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<&'_ Path> for Box<Path>1.17.0[src]
impl From<&'_ Path> for Box<Path>1.17.0[src]fn from(path: &Path) -> Box<Path>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<Cow<'_, CStr>> for Box<CStr>1.45.0[src]
impl From<Cow<'_, CStr>> for Box<CStr>1.45.0[src]fn from(cow: Cow<'_, CStr>) -> Box<CStr>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<Cow<'_, OsStr>> for Box<OsStr>1.45.0[src]
impl From<Cow<'_, OsStr>> for Box<OsStr>1.45.0[src]fn from(cow: Cow<'_, OsStr>) -> Box<OsStr>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<Cow<'_, Path>> for Box<Path>1.45.0[src]
impl From<Cow<'_, Path>> for Box<Path>1.45.0[src]fn from(cow: Cow<'_, Path>) -> Box<Path>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<ErrorKind> for Error1.14.0[src]
impl From<ErrorKind> for Error1.14.0[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<Infallible> for TryFromSliceError1.36.0[src]
impl From<Infallible> for TryFromSliceError1.36.0[src]pub fn from(x: Infallible) -> TryFromSliceError[src]
impl From<Infallible> for TryFromIntError1.34.0[src]
impl From<Infallible> for TryFromIntError1.34.0[src]pub fn from(x: Infallible) -> TryFromIntError[src]
impl From<[u8; 16]> for IpAddr1.17.0[src]
impl From<[u8; 16]> for IpAddr1.17.0[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 );Run
impl From<[u8; 16]> for Ipv6Addr1.9.0[src]
impl From<[u8; 16]> for Ipv6Addr1.9.0[src]fn from(octets: [u8; 16]) -> Ipv6Addr[src]
Creates an Ipv6Addr from a sixteen element byte array.
Examples
use std::net::Ipv6Addr; let addr = Ipv6Addr::from([ 25u8, 24u8, 23u8, 22u8, 21u8, 20u8, 19u8, 18u8, 17u8, 16u8, 15u8, 14u8, 13u8, 12u8, 11u8, 10u8, ]); assert_eq!( Ipv6Addr::new( 0x1918, 0x1716, 0x1514, 0x1312, 0x1110, 0x0f0e, 0x0d0c, 0x0b0a ), addr );Run
impl From<[u16; 8]> for IpAddr1.17.0[src]
impl From<[u16; 8]> for IpAddr1.17.0[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 );Run
impl From<bool> for AtomicBool1.24.0[src]
impl From<bool> for AtomicBool1.24.0[src]impl From<i128> for AtomicI128[src]
impl From<i128> for AtomicI128[src]pub fn from(v: i128) -> AtomicI128[src]
Converts an i128 into an AtomicI128.
impl From<isize> for AtomicIsize1.23.0[src]
impl From<isize> for AtomicIsize1.23.0[src]pub fn from(v: isize) -> AtomicIsize[src]
Converts an isize into an AtomicIsize.
impl From<!> for Infallible1.34.0[src]
impl From<!> for Infallible1.34.0[src]pub fn from(x: !) -> Infallible[src]
impl From<!> for TryFromIntError[src]
impl From<!> for TryFromIntError[src]pub fn from(never: !) -> TryFromIntError[src]
impl From<u8> for char1.13.0[src]
impl From<u8> for char1.13.0[src]Maps a byte in 0x00..=0xFF to a char whose code point has the same value, in U+0000..=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<u128> for AtomicU128[src]
impl From<u128> for AtomicU128[src]pub fn from(v: u128) -> AtomicU128[src]
Converts an u128 into an AtomicU128.
impl From<usize> for AtomicUsize1.23.0[src]
impl From<usize> for AtomicUsize1.23.0[src]pub fn from(v: usize) -> AtomicUsize[src]
Converts an usize into an AtomicUsize.
impl From<LayoutError> for TryReserveError[src]
impl From<LayoutError> for TryReserveError[src]pub fn from(LayoutError) -> TryReserveError[src]
impl From<CString> for Box<CStr>1.20.0[src]
impl From<CString> for Box<CStr>1.20.0[src]fn from(s: CString) -> Box<CStr>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<OsString> for Box<OsStr>1.20.0[src]
impl From<OsString> for Box<OsStr>1.20.0[src]fn from(s: OsString) -> Box<OsStr>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<File> for Stdio1.20.0[src]
impl From<File> for Stdio1.20.0[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");Run
impl From<SocketAddrV4> for SocketAddr1.16.0[src]
impl From<SocketAddrV4> for SocketAddr1.16.0[src]fn from(sock4: SocketAddrV4) -> SocketAddr[src]
Converts a SocketAddrV4 into a SocketAddr::V4.
impl From<SocketAddrV6> for SocketAddr1.16.0[src]
impl From<SocketAddrV6> for SocketAddr1.16.0[src]fn from(sock6: SocketAddrV6) -> SocketAddr[src]
Converts a SocketAddrV6 into a SocketAddr::V6.
impl From<NonZeroI8> for NonZeroI161.41.0[src]
impl From<NonZeroI8> for NonZeroI161.41.0[src]pub fn from(small: NonZeroI8) -> NonZeroI16[src]
Converts NonZeroI8 to NonZeroI16 losslessly.
impl From<NonZeroI8> for NonZeroI321.41.0[src]
impl From<NonZeroI8> for NonZeroI321.41.0[src]pub fn from(small: NonZeroI8) -> NonZeroI32[src]
Converts NonZeroI8 to NonZeroI32 losslessly.
impl From<NonZeroI8> for NonZeroI641.41.0[src]
impl From<NonZeroI8> for NonZeroI641.41.0[src]pub fn from(small: NonZeroI8) -> NonZeroI64[src]
Converts NonZeroI8 to NonZeroI64 losslessly.
impl From<NonZeroI8> for NonZeroI1281.41.0[src]
impl From<NonZeroI8> for NonZeroI1281.41.0[src]pub fn from(small: NonZeroI8) -> NonZeroI128[src]
Converts NonZeroI8 to NonZeroI128 losslessly.
impl From<NonZeroI8> for NonZeroIsize1.41.0[src]
impl From<NonZeroI8> for NonZeroIsize1.41.0[src]pub fn from(small: NonZeroI8) -> NonZeroIsize[src]
Converts NonZeroI8 to NonZeroIsize losslessly.
impl From<NonZeroI16> for i161.31.0[src]
impl From<NonZeroI16> for i161.31.0[src]pub fn from(nonzero: NonZeroI16) -> i16[src]
Converts a NonZeroI16 into an i16
impl From<NonZeroI16> for NonZeroI321.41.0[src]
impl From<NonZeroI16> for NonZeroI321.41.0[src]pub fn from(small: NonZeroI16) -> NonZeroI32[src]
Converts NonZeroI16 to NonZeroI32 losslessly.
impl From<NonZeroI16> for NonZeroI641.41.0[src]
impl From<NonZeroI16> for NonZeroI641.41.0[src]pub fn from(small: NonZeroI16) -> NonZeroI64[src]
Converts NonZeroI16 to NonZeroI64 losslessly.
impl From<NonZeroI16> for NonZeroI1281.41.0[src]
impl From<NonZeroI16> for NonZeroI1281.41.0[src]pub fn from(small: NonZeroI16) -> NonZeroI128[src]
Converts NonZeroI16 to NonZeroI128 losslessly.
impl From<NonZeroI16> for NonZeroIsize1.41.0[src]
impl From<NonZeroI16> for NonZeroIsize1.41.0[src]pub fn from(small: NonZeroI16) -> NonZeroIsize[src]
Converts NonZeroI16 to NonZeroIsize losslessly.
impl From<NonZeroI32> for i321.31.0[src]
impl From<NonZeroI32> for i321.31.0[src]pub fn from(nonzero: NonZeroI32) -> i32[src]
Converts a NonZeroI32 into an i32
impl From<NonZeroI32> for NonZeroI641.41.0[src]
impl From<NonZeroI32> for NonZeroI641.41.0[src]pub fn from(small: NonZeroI32) -> NonZeroI64[src]
Converts NonZeroI32 to NonZeroI64 losslessly.
impl From<NonZeroI32> for NonZeroI1281.41.0[src]
impl From<NonZeroI32> for NonZeroI1281.41.0[src]pub fn from(small: NonZeroI32) -> NonZeroI128[src]
Converts NonZeroI32 to NonZeroI128 losslessly.
impl From<NonZeroI64> for i641.31.0[src]
impl From<NonZeroI64> for i641.31.0[src]pub fn from(nonzero: NonZeroI64) -> i64[src]
Converts a NonZeroI64 into an i64
impl From<NonZeroI64> for NonZeroI1281.41.0[src]
impl From<NonZeroI64> for NonZeroI1281.41.0[src]pub fn from(small: NonZeroI64) -> NonZeroI128[src]
Converts NonZeroI64 to NonZeroI128 losslessly.
impl From<NonZeroI128> for i1281.31.0[src]
impl From<NonZeroI128> for i1281.31.0[src]pub fn from(nonzero: NonZeroI128) -> i128[src]
Converts a NonZeroI128 into an i128
impl From<NonZeroIsize> for isize1.31.0[src]
impl From<NonZeroIsize> for isize1.31.0[src]pub fn from(nonzero: NonZeroIsize) -> isize[src]
Converts a NonZeroIsize into an isize
impl From<NonZeroU8> for NonZeroI161.41.0[src]
impl From<NonZeroU8> for NonZeroI161.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroI16[src]
Converts NonZeroU8 to NonZeroI16 losslessly.
impl From<NonZeroU8> for NonZeroI321.41.0[src]
impl From<NonZeroU8> for NonZeroI321.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroI32[src]
Converts NonZeroU8 to NonZeroI32 losslessly.
impl From<NonZeroU8> for NonZeroI641.41.0[src]
impl From<NonZeroU8> for NonZeroI641.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroI64[src]
Converts NonZeroU8 to NonZeroI64 losslessly.
impl From<NonZeroU8> for NonZeroI1281.41.0[src]
impl From<NonZeroU8> for NonZeroI1281.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroI128[src]
Converts NonZeroU8 to NonZeroI128 losslessly.
impl From<NonZeroU8> for NonZeroIsize1.41.0[src]
impl From<NonZeroU8> for NonZeroIsize1.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroIsize[src]
Converts NonZeroU8 to NonZeroIsize losslessly.
impl From<NonZeroU8> for NonZeroU161.41.0[src]
impl From<NonZeroU8> for NonZeroU161.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroU16[src]
Converts NonZeroU8 to NonZeroU16 losslessly.
impl From<NonZeroU8> for NonZeroU321.41.0[src]
impl From<NonZeroU8> for NonZeroU321.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroU32[src]
Converts NonZeroU8 to NonZeroU32 losslessly.
impl From<NonZeroU8> for NonZeroU641.41.0[src]
impl From<NonZeroU8> for NonZeroU641.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroU64[src]
Converts NonZeroU8 to NonZeroU64 losslessly.
impl From<NonZeroU8> for NonZeroU1281.41.0[src]
impl From<NonZeroU8> for NonZeroU1281.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroU128[src]
Converts NonZeroU8 to NonZeroU128 losslessly.
impl From<NonZeroU8> for NonZeroUsize1.41.0[src]
impl From<NonZeroU8> for NonZeroUsize1.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroUsize[src]
Converts NonZeroU8 to NonZeroUsize losslessly.
impl From<NonZeroU16> for u161.31.0[src]
impl From<NonZeroU16> for u161.31.0[src]pub fn from(nonzero: NonZeroU16) -> u16[src]
Converts a NonZeroU16 into an u16
impl From<NonZeroU16> for NonZeroI321.41.0[src]
impl From<NonZeroU16> for NonZeroI321.41.0[src]pub fn from(small: NonZeroU16) -> NonZeroI32[src]
Converts NonZeroU16 to NonZeroI32 losslessly.
impl From<NonZeroU16> for NonZeroI641.41.0[src]
impl From<NonZeroU16> for NonZeroI641.41.0[src]pub fn from(small: NonZeroU16) -> NonZeroI64[src]
Converts NonZeroU16 to NonZeroI64 losslessly.
impl From<NonZeroU16> for NonZeroI1281.41.0[src]
impl From<NonZeroU16> for NonZeroI1281.41.0[src]pub fn from(small: NonZeroU16) -> NonZeroI128[src]
Converts NonZeroU16 to NonZeroI128 losslessly.
impl From<NonZeroU16> for NonZeroU321.41.0[src]
impl From<NonZeroU16> for NonZeroU321.41.0[src]pub fn from(small: NonZeroU16) -> NonZeroU32[src]
Converts NonZeroU16 to NonZeroU32 losslessly.
impl From<NonZeroU16> for NonZeroU641.41.0[src]
impl From<NonZeroU16> for NonZeroU641.41.0[src]pub fn from(small: NonZeroU16) -> NonZeroU64[src]
Converts NonZeroU16 to NonZeroU64 losslessly.
impl From<NonZeroU16> for NonZeroU1281.41.0[src]
impl From<NonZeroU16> for NonZeroU1281.41.0[src]pub fn from(small: NonZeroU16) -> NonZeroU128[src]
Converts NonZeroU16 to NonZeroU128 losslessly.
impl From<NonZeroU16> for NonZeroUsize1.41.0[src]
impl From<NonZeroU16> for NonZeroUsize1.41.0[src]pub fn from(small: NonZeroU16) -> NonZeroUsize[src]
Converts NonZeroU16 to NonZeroUsize losslessly.
impl From<NonZeroU32> for u321.31.0[src]
impl From<NonZeroU32> for u321.31.0[src]pub fn from(nonzero: NonZeroU32) -> u32[src]
Converts a NonZeroU32 into an u32
impl From<NonZeroU32> for NonZeroI641.41.0[src]
impl From<NonZeroU32> for NonZeroI641.41.0[src]pub fn from(small: NonZeroU32) -> NonZeroI64[src]
Converts NonZeroU32 to NonZeroI64 losslessly.
impl From<NonZeroU32> for NonZeroI1281.41.0[src]
impl From<NonZeroU32> for NonZeroI1281.41.0[src]pub fn from(small: NonZeroU32) -> NonZeroI128[src]
Converts NonZeroU32 to NonZeroI128 losslessly.
impl From<NonZeroU32> for NonZeroU641.41.0[src]
impl From<NonZeroU32> for NonZeroU641.41.0[src]pub fn from(small: NonZeroU32) -> NonZeroU64[src]
Converts NonZeroU32 to NonZeroU64 losslessly.
impl From<NonZeroU32> for NonZeroU1281.41.0[src]
impl From<NonZeroU32> for NonZeroU1281.41.0[src]pub fn from(small: NonZeroU32) -> NonZeroU128[src]
Converts NonZeroU32 to NonZeroU128 losslessly.
impl From<NonZeroU64> for u641.31.0[src]
impl From<NonZeroU64> for u641.31.0[src]pub fn from(nonzero: NonZeroU64) -> u64[src]
Converts a NonZeroU64 into an u64
impl From<NonZeroU64> for NonZeroI1281.41.0[src]
impl From<NonZeroU64> for NonZeroI1281.41.0[src]pub fn from(small: NonZeroU64) -> NonZeroI128[src]
Converts NonZeroU64 to NonZeroI128 losslessly.
impl From<NonZeroU64> for NonZeroU1281.41.0[src]
impl From<NonZeroU64> for NonZeroU1281.41.0[src]pub fn from(small: NonZeroU64) -> NonZeroU128[src]
Converts NonZeroU64 to NonZeroU128 losslessly.
impl From<NonZeroU128> for u1281.31.0[src]
impl From<NonZeroU128> for u1281.31.0[src]pub fn from(nonzero: NonZeroU128) -> u128[src]
Converts a NonZeroU128 into an u128
impl From<NonZeroUsize> for usize1.31.0[src]
impl From<NonZeroUsize> for usize1.31.0[src]pub fn from(nonzero: NonZeroUsize) -> usize[src]
Converts a NonZeroUsize into an usize
impl From<PathBuf> for Box<Path>1.20.0[src]
impl From<PathBuf> for Box<Path>1.20.0[src]fn from(p: PathBuf) -> Box<Path>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>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<ChildStderr> for Stdio1.20.0[src]
impl From<ChildStderr> for Stdio1.20.0[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" );Run
impl From<ChildStdin> for Stdio1.20.0[src]
impl From<ChildStdin> for Stdio1.20.0[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 consoleRun
impl From<ChildStdout> for Stdio1.20.0[src]
impl From<ChildStdout> for Stdio1.20.0[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");Run
impl From<String> for Box<str, Global>1.20.0[src]
impl From<String> for Box<str, Global>1.20.0[src]pub fn from(s: String) -> Box<str, Global>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<String> for Box<dyn Error + Send + Sync>[src]
impl From<String> for Box<dyn Error + Send + Sync>[src]fn from(err: String) -> Box<dyn Error + Send + Sync>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>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::<dyn Error + Send + Sync>::from(a_string_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))Run
impl From<String> for Box<dyn Error>1.6.0[src]
impl From<String> for Box<dyn Error>1.6.0[src]fn from(str_err: String) -> Box<dyn Error>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl From<String> for Vec<u8, Global>1.14.0[src]
impl From<String> for Vec<u8, Global>1.14.0[src]impl From<RecvError> for RecvTimeoutError1.24.0[src]
impl From<RecvError> for RecvTimeoutError1.24.0[src]fn from(err: RecvError) -> RecvTimeoutError[src]
Converts a RecvError into a RecvTimeoutError.
This conversion always returns RecvTimeoutError::Disconnected.
No data is allocated on the heap.
impl From<RecvError> for TryRecvError1.24.0[src]
impl From<RecvError> for TryRecvError1.24.0[src]fn from(err: RecvError) -> TryRecvError[src]
Converts a RecvError into a TryRecvError.
This conversion always returns TryRecvError::Disconnected.
No data is allocated on the heap.
impl<'_> From<&'_ str> for Box<str, Global>1.17.0[src]
impl<'_> From<&'_ str> for Box<str, Global>1.17.0[src]pub fn from(s: &str) -> Box<str, Global>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<'_> From<Cow<'_, str>> for Box<str, Global>1.45.0[src]
impl<'_> From<Cow<'_, str>> for Box<str, Global>1.45.0[src]pub fn from(cow: Cow<'_, str>) -> Box<str, Global>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<'_, T> From<Cow<'_, [T]>> for Box<[T], Global> where
T: Copy, 1.45.0[src]
impl<'_, T> From<Cow<'_, [T]>> for Box<[T], Global> where
T: Copy, 1.45.0[src]pub fn from(cow: Cow<'_, [T]>) -> Box<[T], Global>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<'_, T> From<&'_ [T]> for Box<[T], Global> where
T: Copy, 1.17.0[src]
impl<'_, T> From<&'_ [T]> for Box<[T], Global> where
T: Copy, 1.17.0[src]pub fn from(slice: &[T]) -> Box<[T], Global>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<'a> From<&'_ str> for Box<dyn Error + Send + Sync + 'a>[src]
impl<'a> From<&'_ str> for Box<dyn Error + Send + Sync + 'a>[src]fn from(err: &str) -> Box<dyn Error + Send + Sync + 'a>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<'a> From<Cow<'a, str>> for Box<dyn Error>1.22.0[src]
impl<'a> From<Cow<'a, str>> for Box<dyn Error>1.22.0[src]fn from(err: Cow<'a, str>) -> Box<dyn Error>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + Send + Sync + 'a>1.22.0[src]
impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + Send + Sync + 'a>1.22.0[src]fn from(err: Cow<'b, str>) -> Box<dyn Error + Send + Sync + 'a>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>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::<dyn Error + Send + Sync>::from(a_cow_str_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))Run
impl<'a, B> From<Cow<'a, B>> for Rc<B> where
B: ToOwned + ?Sized,
Rc<B>: From<&'a B>,
Rc<B>: From<<B as ToOwned>::Owned>, 1.45.0[src]
impl<'a, B> From<Cow<'a, B>> for Rc<B> where
B: ToOwned + ?Sized,
Rc<B>: From<&'a B>,
Rc<B>: From<<B as ToOwned>::Owned>, 1.45.0[src]impl<'a, B> From<Cow<'a, B>> for Arc<B> where
B: ToOwned + ?Sized,
Arc<B>: From<&'a B>,
Arc<B>: From<<B as ToOwned>::Owned>, 1.45.0[src]
impl<'a, B> From<Cow<'a, B>> for Arc<B> where
B: ToOwned + ?Sized,
Arc<B>: From<&'a B>,
Arc<B>: From<<B as ToOwned>::Owned>, 1.45.0[src]impl<'a, E: Error + 'a> From<E> for Box<dyn Error + 'a>[src]
impl<'a, E: Error + 'a> From<E> for Box<dyn Error + 'a>[src]fn from(err: E) -> Box<dyn Error + 'a>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>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 {} let an_error = AnError; assert!(0 == mem::size_of_val(&an_error)); let a_boxed_error = Box::<dyn Error>::from(an_error); assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))Run
impl<'a, E: Error + Send + Sync + 'a> From<E> for Box<dyn Error + Send + Sync + 'a>[src]
impl<'a, E: Error + Send + Sync + 'a> From<E> for Box<dyn Error + Send + Sync + 'a>[src]fn from(err: E) -> Box<dyn Error + Send + Sync + 'a>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>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 {} 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::<dyn Error + Send + Sync>::from(an_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))Run
impl<'a, T> From<&'a Option<T>> for Option<&'a T>1.30.0[src]
impl<'a, T> From<&'a Option<T>> for Option<&'a T>1.30.0[src]pub fn from(o: &'a Option<T>) -> Option<&'a T>[src]
Converts from &Option<T> to Option<&T>.
Examples
Converts an Option<String> into an Option<usize>, preserving the original.
The map method takes the self argument by value, consuming the original,
so this technique uses as_ref to first take an Option to a reference
to the value inside the original.
let s: Option<String> = Some(String::from("Hello, Rustaceans!")); let o: Option<usize> = Option::from(&s).map(|ss: &String| ss.len()); println!("Can still print s: {:?}", s); assert_eq!(o, Some(18));Run
impl<'a, T> From<&'a mut Option<T>> for Option<&'a mut T>1.30.0[src]
impl<'a, T> From<&'a mut Option<T>> for Option<&'a mut T>1.30.0[src]impl<'a, T> From<Cow<'a, [T]>> for Vec<T, Global> where
[T]: ToOwned,
<[T] as ToOwned>::Owned == Vec<T, Global>, 1.14.0[src]
impl<'a, T> From<Cow<'a, [T]>> for Vec<T, Global> where
[T]: ToOwned,
<[T] as ToOwned>::Owned == Vec<T, Global>, 1.14.0[src]pub fn from(s: Cow<'a, [T]>) -> Vec<T, Global>ⓘ[src]
Convert a clone-on-write slice into a vector.
If s already owns a Vec<T>, it will be returned directly.
If s is borrowing a slice, a new Vec<T> will be allocated and
filled by cloning s’s items into it.
Examples
let o: Cow<[i32]> = Cow::Owned(vec![1, 2, 3]); let b: Cow<[i32]> = Cow::Borrowed(&[1, 2, 3]); assert_eq!(Vec::from(o), Vec::from(b));Run
impl<A> From<Box<str, A>> for Box<[u8], A> where
A: Allocator, 1.19.0[src]
impl<A> From<Box<str, A>> for Box<[u8], A> where
A: Allocator, 1.19.0[src]pub fn from(s: Box<str, A>) -> Box<[u8], A>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>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);Run
impl<I: Into<IpAddr>> From<(I, u16)> for SocketAddr1.17.0[src]
impl<I: Into<IpAddr>> From<(I, u16)> for SocketAddr1.17.0[src]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<!> for T1.34.0[src]
impl<T> From<!> for T1.34.0[src]Stability note: This impl does not yet exist, but we are “reserving space” to add it in the future. See rust-lang/rust#64715 for details.
impl<T> From<BinaryHeap<T>> for Vec<T, Global>1.5.0[src]
impl<T> From<BinaryHeap<T>> for Vec<T, Global>1.5.0[src]impl<T> From<VecDeque<T>> for Vec<T, Global>1.10.0[src]
impl<T> From<VecDeque<T>> for Vec<T, Global>1.10.0[src]pub fn from(other: VecDeque<T>) -> Vec<T, Global>ⓘ[src]
Turn a VecDeque<T> into a Vec<T>.
This never needs to re-allocate, but does need to do O(n) data movement if the circular buffer doesn’t happen to be at the beginning of the allocation.
Examples
use std::collections::VecDeque; // This one is *O*(1). let deque: VecDeque<_> = (1..5).collect(); let ptr = deque.as_slices().0.as_ptr(); let vec = Vec::from(deque); assert_eq!(vec, [1, 2, 3, 4]); assert_eq!(vec.as_ptr(), ptr); // This one needs data rearranging. let mut deque: VecDeque<_> = (1..5).collect(); deque.push_front(9); deque.push_front(8); let ptr = deque.as_slices().1.as_ptr(); let vec = Vec::from(deque); assert_eq!(vec, [8, 9, 1, 2, 3, 4]); assert_eq!(vec.as_ptr(), ptr);Run
impl<T> From<SendError<T>> for TrySendError<T>1.24.0[src]
impl<T> From<SendError<T>> for TrySendError<T>1.24.0[src]fn from(err: SendError<T>) -> TrySendError<T>[src]
Converts a SendError<T> into a TrySendError<T>.
This conversion always returns a TrySendError::Disconnected containing the data in the SendError<T>.
No data is allocated on the heap.
impl<T> From<PoisonError<T>> for TryLockError<T>[src]
impl<T> From<PoisonError<T>> for TryLockError<T>[src]fn from(err: PoisonError<T>) -> TryLockError<T>[src]
impl<T> From<Vec<T, Global>> for BinaryHeap<T> where
T: Ord, 1.5.0[src]
impl<T> From<Vec<T, Global>> for BinaryHeap<T> where
T: Ord, 1.5.0[src]pub fn from(vec: Vec<T, Global>) -> BinaryHeap<T>[src]
Converts a Vec<T> into a BinaryHeap<T>.
This conversion happens in-place, and has O(n) time complexity.
impl<T> From<T> for Box<T, Global>1.6.0[src]
impl<T> From<T> for Box<T, Global>1.6.0[src]pub fn from(t: T) -> Box<T, Global>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<T> From<T> for UnsafeCell<T>1.12.0[src]
impl<T> From<T> for UnsafeCell<T>1.12.0[src]pub fn from(t: T) -> UnsafeCell<T>[src]
impl<T> From<T> for SyncOnceCell<T>[src]
impl<T> From<T> for SyncOnceCell<T>[src]impl<T> From<T> for Mutex<T>1.24.0[src]
impl<T> From<T> for Mutex<T>1.24.0[src]fn from(t: T) -> Self[src]
Creates a new mutex in an unlocked state ready for use.
This is equivalent to Mutex::new.
impl<T> From<T> for RwLock<T>1.24.0[src]
impl<T> From<T> for RwLock<T>1.24.0[src]fn from(t: T) -> Self[src]
Creates a new instance of an RwLock<T> which is unlocked.
This is equivalent to RwLock::new.
impl<T, A> From<Box<[T], A>> for Vec<T, A> where
A: Allocator, 1.18.0[src]
impl<T, A> From<Box<[T], A>> for Vec<T, A> where
A: Allocator, 1.18.0[src]impl<T, A> From<Box<T, A>> for Pin<Box<T, A>> where
T: ?Sized,
A: Allocator + 'static, 1.33.0[src]
impl<T, A> From<Box<T, A>> for Pin<Box<T, A>> where
T: ?Sized,
A: Allocator + 'static, 1.33.0[src]impl<T, A> From<Vec<T, A>> for Box<[T], A> where
A: Allocator, 1.20.0[src]
impl<T, A> From<Vec<T, A>> for Box<[T], A> where
A: Allocator, 1.20.0[src]pub fn from(v: Vec<T, A>) -> Box<[T], A>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<T, const N: usize> From<[T; N]> for Box<[T], Global>1.45.0[src]
impl<T, const N: usize> From<[T; N]> for Box<[T], Global>1.45.0[src]pub fn from(array: [T; N]) -> Box<[T], Global>ⓘNotable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>[src]
Notable traits for Box<I, A>
impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>impl<W> From<IntoInnerError<W>> for Error[src]
impl<W> From<IntoInnerError<W>> for Error[src]