## ToOwned

# Trait ToOwned

1.36.0 · Source

    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) { ... }
    }

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.

## Required Associated Types§

1.0.0 · Source

#### type Owned: Borrow<Self>

The resulting type after obtaining ownership.

## Required Methods§

1.0.0 · Source

#### 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§

1.63.0 · Source

#### 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§

1.0.0 · Source§

### impl ToOwned for str

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#### type Owned = String

1.3.0 · Source§

### impl ToOwned for CStr

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#### type Owned = CString

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### impl ToOwned for ByteStr

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#### type Owned = ByteString

1.0.0 · Source§

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

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#### type Owned = T

1.0.0 · Source§

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

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#### type Owned = Vec<T>