alloc::borrow::ToOwned - Rust
Description: API documentation for the Rust `ToOwned` trait in crate `alloc`.
Keywords: rust, rustlang, rust-lang, ToOwned

# Trait alloc::borrow::ToOwned 1.0.0 [−] [src]

    pub trait ToOwned {
        type Owned: Borrow<Self>;
        fn to_owned(&self) -> Self::Owned;

        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.

## Associated Types

### `type Owned: Borrow<Self>`

## 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)`

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

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);

## Implementors

- `impl<T> ToOwned for T where
  T: Clone, type Owned = T;`
- `impl<T: Clone> ToOwned for [T] type Owned = Vec<T>;`
- `impl ToOwned for str type Owned = String;`

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
↑
  Move up in search results
↓
  Move down in search results
↹
  Switch tab
⏎
  Go to active search result
+ / -
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)