pub trait CollectionExt<T>: Sized
where T: IntoIterator,
{ // Required methods fn into_first(self) -> T::Item; fn into_last(self) -> T::Item; fn expect_element<Err: Display>( self, msg_fn: impl FnOnce() -> Err ) -> T::Item; // Provided method fn into_element(self) -> T::Item { ... } }
Expand description

Extension methods for collections.

Required Methods§

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fn into_first(self) -> T::Item

Consumes the collection and returns its first element.

This method panics if the collection does not have at least one element.

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fn into_last(self) -> T::Item

Consumes the collection and returns its last element.

This method panics if the collection does not have at least one element.

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fn expect_element<Err: Display>(self, msg_fn: impl FnOnce() -> Err) -> T::Item

Consumes the collection and returns its only element.

This method panics with the given error function’s return value if the collection does not have exactly one element.

Provided Methods§

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fn into_element(self) -> T::Item

Consumes the collection and returns its only element.

This method panics if the collection does not have exactly one element.

Object Safety§

This trait is not object safe.

Implementors§

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impl<T> CollectionExt<T> for T
where T: IntoIterator,