Trait ToOwned

pub trait ToOwned {
    type Owned: Borrow<Self>;

    // Required method
    fn to_owned(&self) -> Self::Owned;

    // Provided method
    fn clone_into(&self, target: &mut Self::Owned) { ... }
}

A generalization of Clone to borrowed data.

Some types make it possible to go from borrowed to owned, usually by implementing the Clone trait. But Clone works only for going from &T to T. The ToOwned trait generalizes Clone to construct owned data from any borrow of a given type.

Required Associated Types

type Owned: Borrow<Self>

The resulting type after obtaining ownership.

Required Methods

fn to_owned(&self) -> Self::Owned

Creates owned data from borrowed data, usually by cloning.

Examples

Basic usage:

let s: &str = "a";
let ss: String = s.to_owned();

let v: &[i32] = &[1, 2];
let vv: Vec<i32> = v.to_owned();

Provided Methods

fn clone_into(&self, target: &mut Self::Owned)

Uses borrowed data to replace owned data, usually by cloning.

This is borrow-generalized version of Clone::clone_from.

Examples

Basic usage:

let mut s: String = String::new();
"hello".clone_into(&mut s);

let mut v: Vec<i32> = Vec::new();
[1, 2][..].clone_into(&mut v);

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl ToOwned for str

type Owned = String

impl ToOwned for CStr

type Owned = CString

impl<T> ToOwned for T

where T: Clone,

type Owned = T

impl<T: Clone> ToOwned for [T]

type Owned = Vec<T>