ToOwned in alloc::borrow - Rust
Description: A generalization of `Clone` to borrowed data.
Keywords: rust, rustlang, rust-lang, ToOwned

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

    pub trait ToOwned {
        type Owned: Borrow<Self>;
        #[must_use = "cloning is often expensive and is not expected to have side effects"]
        fn to_owned(&self) -> Self::Owned;

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

Expand description

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>

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The resulting type after obtaining ownership.

## Required methods

####
#[must_use = "cloning is often expensive and is not expected to have side effects"]
fn to_owned(&self) -> Self::Owned

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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();

Run

## Provided methods

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

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🔬 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);

Run

## Implementors

### impl ToOwned for str

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#### type Owned = String

#### fn to_owned(&self) -> String

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#### fn clone_into(&self, target: &mut String)

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

recently added

### impl<T> ToOwned for T where
T: Clone,

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#### type Owned = T

#### fn to_owned(&self) -> T

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#### fn clone_into(&self, target: &mut T)

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

recently added

### impl<T: Clone> ToOwned for [T]

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#### type Owned = Vec<T>

#### fn to_owned(&self) -> Vec<T>

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#### fn clone_into(&self, target: &mut Vec<T>)

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

recently added