FlatMapInPlaceVec in rustc_data_structures::flat_map_in_place - Rust
Description: A vec-like type must implement these operations to support `flat_map_in_place`.

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## FlatMapInPlaceVec

# Trait FlatMapInPlaceVec

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    pub unsafe trait FlatMapInPlaceVec {
        type Elem;

        // Required methods
        fn len(&self) -> usize;
        unsafe fn set_len(&mut self, len: usize);
        fn as_ptr(&self) -> *const Self::Elem;
        fn as_mut_ptr(&mut self) -> *mut Self::Elem;
        fn insert(&mut self, idx: usize, elem: Self::Elem);
    }

Expand description

A vec-like type must implement these operations to support `flat_map_in_place`.

## §Safety

The memory safety of the unsafe block in `flat_map_in_place` relies on impls of this trait implementing all the operations correctly.

## Required Associated Types§

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#### type Elem

## Required Methods§

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#### fn len(&self) -> usize

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#### unsafe fn set_len(&mut self, len: usize)

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#### fn as_ptr(&self) -> *const Self::Elem

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#### fn as_mut_ptr(&mut self) -> *mut Self::Elem

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#### fn insert(&mut self, idx: usize, elem: Self::Elem)

## Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

## Implementations on Foreign Types§

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### impl<T, const N: usize> FlatMapInPlaceVec for SmallVec<[T; N]>

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#### type Elem = T

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#### fn len(&self) -> usize

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#### unsafe fn set_len(&mut self, len: usize)

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#### fn as_ptr(&self) -> *const Self::Elem

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#### fn as_mut_ptr(&mut self) -> *mut Self::Elem

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#### fn insert(&mut self, idx: usize, elem: Self::Elem)

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### impl<T> FlatMapInPlaceVec for ThinVec<T>

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#### type Elem = T

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#### fn len(&self) -> usize

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#### unsafe fn set_len(&mut self, len: usize)

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#### fn as_ptr(&self) -> *const Self::Elem

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#### fn as_mut_ptr(&mut self) -> *mut Self::Elem

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#### fn insert(&mut self, idx: usize, elem: Self::Elem)

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### impl<T> FlatMapInPlaceVec for Vec<T>

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#### type Elem = T

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#### fn len(&self) -> usize

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#### unsafe fn set_len(&mut self, len: usize)

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#### fn as_ptr(&self) -> *const Self::Elem

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#### fn as_mut_ptr(&mut self) -> *mut Self::Elem

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#### fn insert(&mut self, idx: usize, elem: Self::Elem)

## Implementors§