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URL: https://doc.rust-lang.org/std/option/../string/../ffi/../slice/trait.Concat.html

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Concat

Trait Concat

pub trait Concat<Item>where
    Item: ?Sized,{
    type Output;

    // Required method
    fn concat(slice: &Self) -> Self::Output;
}

🔬This is a nightly-only experimental API. (slice_concat_trait #27747)

Expand description

Helper trait for [T]::concat.

Note: the Item type parameter is not used in this trait, but it allows impls to be more generic. Without it, we get this error:

error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predica
   --> library/alloc/src/slice.rs:608:6
    |
608 | impl<T: Clone, V: Borrow<[T]>> Concat for [V] {
    |      ^ unconstrained type parameter

This is because there could exist V types with multiple Borrow<[_]> impls, such that multiple T types would apply:

pub struct Foo(Vec<u32>, Vec<String>);

impl std::borrow::Borrow<[u32]> for Foo {
    fn borrow(&self) -> &[u32] { &self.0 }
}

impl std::borrow::Borrow<[String]> for Foo {
    fn borrow(&self) -> &[String] { &self.1 }
}

Required Associated Types§

type Output

🔬This is a nightly-only experimental API. (slice_concat_trait #27747)

The resulting type after concatenation

Required Methods§

fn concat(slice: &Self) -> Self::Output

🔬This is a nightly-only experimental API. (slice_concat_trait #27747)

Implementation of [T]::concat

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<S> Concat<str> for [S]
where S: Borrow<str>,

Note: str in Concat<str> is not meaningful here. This type parameter of the trait only exists to enable another impl.

type Output = String

impl<T, V> Concat<T> for [V]
where T: Clone, V: Borrow<[T]>,

type Output = Vec<T>

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