Struct zerovec::vecs::VarZeroVecOwned

pub struct VarZeroVecOwned<T: ?Sized, F = Index16> {
    marker: PhantomData<(Box<T>, F)>,
    entire_slice: Vec<u8>,
}

A fully-owned VarZeroVec. This type has no lifetime but has the same internal buffer representation of VarZeroVec, making it cheaply convertible to VarZeroVec and VarZeroSlice.

The F type parameter is a VarZeroVecFormat (see its docs for more details), which can be used to select the precise format of the backing buffer with various size and performance tradeoffs. It defaults to Index16.

Fields

marker: PhantomData<(Box<T>, F)>

entire_slice: Vec<u8>

Implementations

impl<T: VarULE + ?Sized, F> VarZeroVecOwned<T, F>

pub fn new() -> Self

Construct an empty VarZeroVecOwned

impl<T: VarULE + ?Sized, F: VarZeroVecFormat> VarZeroVecOwned<T, F>

pub fn from_slice(slice: &VarZeroSlice<T, F>) -> Self

Construct a VarZeroVecOwned from a VarZeroSlice by cloning the internal data

pub fn try_from_elements<A>(elements: &[A]) -> Result<Self, &'static str>

where A: EncodeAsVarULE<T>,

Construct a VarZeroVecOwned from a list of elements

pub fn as_slice(&self) -> &VarZeroSlice<T, F>

Obtain this VarZeroVec as a VarZeroSlice

pub(crate) fn with_capacity(capacity: usize) -> Self

Try to allocate a buffer with enough capacity for capacity elements. Since T can take up an arbitrary size this will just allocate enough space for 4-byte Ts

pub(crate) fn reserve(&mut self, capacity: usize)

Try to reserve space for capacity elements. Since T can take up an arbitrary size this will just allocate enough space for 4-byte Ts

unsafe fn element_position_unchecked(&self, idx: usize) -> usize

Get the position of a specific element in the data segment.

If idx == self.len(), it will return the size of the data segment (where a new element would go).

Safety

idx <= self.len() and self.as_encoded_bytes() is well-formed.

unsafe fn element_range_unchecked(&self, idx: usize) -> Range<usize>

Get the range of a specific element in the data segment.

Safety

idx < self.len() and self.as_encoded_bytes() is well-formed.

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

Set the number of elements in the list without any checks.

Safety

No safe functions may be called until self.as_encoded_bytes() is well-formed.

fn index_range(index: usize) -> Range<usize>

unsafe fn index_data(&self, index: usize) -> &F::RawBytes

Return the raw bytes representing the given index.

Safety

The index must be valid, and self.as_encoded_bytes() must be well-formed

unsafe fn index_data_mut(&mut self, index: usize) -> &mut F::RawBytes

Return the mutable slice representing the given index.

Safety

The index must be valid. self.as_encoded_bytes() must have allocated space for this index, but need not have its length appropriately set.

unsafe fn shift_indices(&mut self, starting_index: usize, amount: i32)

Shift the indices starting with and after starting_index by the provided amount.

Safety

Adding amount to each index after starting_index must not result in the slice from becoming malformed. The length of the slice must be correctly set.

pub fn as_varzerovec<'a>(&'a self) -> VarZeroVec<'a, T, F>

Get this VarZeroVecOwned as a borrowed VarZeroVec

If you wish to repeatedly call methods on this VarZeroVecOwned, it is more efficient to perform this conversion first

pub fn clear(&mut self)

Empty the vector

pub fn into_bytes(self) -> Vec<u8>

Consume this vector and return the backing buffer

unsafe fn shift( &mut self, index: usize, new_size: usize, shift_type: ShiftType, ) -> &mut [u8]

Invalidate and resize the data at an index, optionally inserting or removing the index. Also updates affected indices and the length. Returns a slice to the new element data - it doesn’t contain uninitialized data but its value is indeterminate.

Safety

• index must be a valid index, or, if shift_type == ShiftType::Insert, index == self.len() is allowed.
• new_size musn’t result in the data segment growing larger than F::MAX_VALUE.

fn verify_integrity(&self) -> bool

Checks the internal invariants of the vec to ensure safe code will not cause UB. Returns whether integrity was verified.

Note: an index is valid if it doesn’t point to data past the end of the slice and is less than or equal to all future indices. The length of the index segment is not part of each index.

pub fn push<A: EncodeAsVarULE<T> + ?Sized>(&mut self, element: &A)

Insert an element at the end of this vector

pub fn insert<A: EncodeAsVarULE<T> + ?Sized>( &mut self, index: usize, element: &A, )

Insert an element at index idx

pub fn remove(&mut self, index: usize)

Remove the element at index idx

pub fn replace<A: EncodeAsVarULE<T> + ?Sized>( &mut self, index: usize, element: &A, )

Replace the element at index idx with another

Methods from Deref<Target = VarZeroSlice<T, F>>

pub(crate) fn as_components<'a>(&'a self) -> VarZeroVecComponents<'a, T, F>

Obtain a VarZeroVecComponents borrowing from the internal buffer

pub fn len(&self) -> usize

Get the number of elements in this slice

Example

let strings = vec!["foo", "bar", "baz", "quux"];
let vec = VarZeroVec::<str>::from(&strings);

assert_eq!(vec.len(), 4);

pub fn is_empty(&self) -> bool

Returns true if the slice contains no elements.

Examples

let strings: Vec<String> = vec![];
let vec = VarZeroVec::<str>::from(&strings);

assert!(vec.is_empty());

pub fn iter<'b>(&'b self) -> impl Iterator<Item = &'b T>

Obtain an iterator over this slice’s elements

Example

let strings = vec!["foo", "bar", "baz", "quux"];
let vec = VarZeroVec::<str>::from(&strings);

let mut iter_results: Vec<&str> = vec.iter().collect();
assert_eq!(iter_results[0], "foo");
assert_eq!(iter_results[1], "bar");
assert_eq!(iter_results[2], "baz");
assert_eq!(iter_results[3], "quux");

pub fn get(&self, idx: usize) -> Option<&T>

Get one of this slice’s elements, returning None if the index is out of bounds

Example

let strings = vec!["foo", "bar", "baz", "quux"];
let vec = VarZeroVec::<str>::from(&strings);

let mut iter_results: Vec<&str> = vec.iter().collect();
assert_eq!(vec.get(0), Some("foo"));
assert_eq!(vec.get(1), Some("bar"));
assert_eq!(vec.get(2), Some("baz"));
assert_eq!(vec.get(3), Some("quux"));
assert_eq!(vec.get(4), None);

pub unsafe fn get_unchecked(&self, idx: usize) -> &T

Get one of this slice’s elements

Safety

index must be in range

Example

let strings = vec!["foo", "bar", "baz", "quux"];
let vec = VarZeroVec::<str>::from(&strings);

let mut iter_results: Vec<&str> = vec.iter().collect();
unsafe {
    assert_eq!(vec.get_unchecked(0), "foo");
    assert_eq!(vec.get_unchecked(1), "bar");
    assert_eq!(vec.get_unchecked(2), "baz");
    assert_eq!(vec.get_unchecked(3), "quux");
}

pub fn to_vec(&self) -> Vec<Box<T>>

Obtain an owned Vec<Box<T>> out of this

pub fn as_bytes(&self) -> &[u8]

Get a reference to the entire encoded backing buffer of this slice

The bytes can be passed back to Self::parse_byte_slice().

To take the bytes as a vector, see VarZeroVec::into_bytes().

Example

let strings = vec!["foo", "bar", "baz"];
let vzv = VarZeroVec::<str>::from(&strings);

assert_eq!(vzv, VarZeroVec::parse_byte_slice(vzv.as_bytes()).unwrap());

pub fn as_varzerovec<'a>(&'a self) -> VarZeroVec<'a, T, F>

Get this VarZeroSlice as a borrowed VarZeroVec

If you wish to repeatedly call methods on this VarZeroSlice, it is more efficient to perform this conversion first

pub fn binary_search(&self, x: &T) -> Result<usize, usize>

Binary searches a sorted VarZeroVec<T> for the given element. For more information, see the standard library function binary_search.

Example

let strings = vec!["a", "b", "f", "g"];
let vec = VarZeroVec::<str>::from(&strings);

assert_eq!(vec.binary_search("f"), Ok(2));
assert_eq!(vec.binary_search("e"), Err(2));

pub fn binary_search_in_range( &self, x: &T, range: Range<usize>, ) -> Option<Result<usize, usize>>

Binary searches a VarZeroVec<T> for the given element within a certain sorted range.

If the range is out of bounds, returns None. Otherwise, returns a Result according to the behavior of the standard library function binary_search.

The index is returned relative to the start of the range.

Example

let strings = vec!["a", "b", "f", "g", "m", "n", "q"];
let vec = VarZeroVec::<str>::from(&strings);

// Same behavior as binary_search when the range covers the whole slice:
assert_eq!(vec.binary_search_in_range("g", 0..7), Some(Ok(3)));
assert_eq!(vec.binary_search_in_range("h", 0..7), Some(Err(4)));

// Will not look outside of the range:
assert_eq!(vec.binary_search_in_range("g", 0..1), Some(Err(1)));
assert_eq!(vec.binary_search_in_range("g", 6..7), Some(Err(0)));

// Will return indices relative to the start of the range:
assert_eq!(vec.binary_search_in_range("g", 1..6), Some(Ok(2)));
assert_eq!(vec.binary_search_in_range("h", 1..6), Some(Err(3)));

// Will return `None` if the range is out of bounds:
assert_eq!(vec.binary_search_in_range("x", 100..200), None);
assert_eq!(vec.binary_search_in_range("x", 0..200), None);

pub fn binary_search_by( &self, predicate: impl FnMut(&T) -> Ordering, ) -> Result<usize, usize>

Binary searches a sorted VarZeroVec<T> for the given predicate. For more information, see the standard library function binary_search_by.

Example

let strings = vec!["a", "b", "f", "g"];
let vec = VarZeroVec::<str>::from(&strings);

assert_eq!(vec.binary_search_by(|probe| probe.cmp("f")), Ok(2));
assert_eq!(vec.binary_search_by(|probe| probe.cmp("e")), Err(2));

pub fn binary_search_in_range_by( &self, predicate: impl FnMut(&T) -> Ordering, range: Range<usize>, ) -> Option<Result<usize, usize>>

Binary searches a VarZeroVec<T> for the given predicate within a certain sorted range.

If the range is out of bounds, returns None. Otherwise, returns a Result according to the behavior of the standard library function binary_search.

The index is returned relative to the start of the range.

Example

let strings = vec!["a", "b", "f", "g", "m", "n", "q"];
let vec = VarZeroVec::<str>::from(&strings);

// Same behavior as binary_search when the range covers the whole slice:
assert_eq!(
    vec.binary_search_in_range_by(|v| v.cmp("g"), 0..7),
    Some(Ok(3))
);
assert_eq!(
    vec.binary_search_in_range_by(|v| v.cmp("h"), 0..7),
    Some(Err(4))
);

// Will not look outside of the range:
assert_eq!(
    vec.binary_search_in_range_by(|v| v.cmp("g"), 0..1),
    Some(Err(1))
);
assert_eq!(
    vec.binary_search_in_range_by(|v| v.cmp("g"), 6..7),
    Some(Err(0))
);

// Will return indices relative to the start of the range:
assert_eq!(
    vec.binary_search_in_range_by(|v| v.cmp("g"), 1..6),
    Some(Ok(2))
);
assert_eq!(
    vec.binary_search_in_range_by(|v| v.cmp("h"), 1..6),
    Some(Err(3))
);

// Will return `None` if the range is out of bounds:
assert_eq!(
    vec.binary_search_in_range_by(|v| v.cmp("x"), 100..200),
    None
);
assert_eq!(vec.binary_search_in_range_by(|v| v.cmp("x"), 0..200), None);

Trait Implementations

impl<T: ?Sized, F> Clone for VarZeroVecOwned<T, F>

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T, F: VarZeroVecFormat> Debug for VarZeroVecOwned<T, F>

where T: Debug + VarULE + ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: VarULE + ?Sized, F> Default for VarZeroVecOwned<T, F>

fn default() -> Self

Returns the “default value” for a type.

impl<T: VarULE + ?Sized, F: VarZeroVecFormat> Deref for VarZeroVecOwned<T, F>

type Target = VarZeroSlice<T, F>

The resulting type after dereferencing.

fn deref(&self) -> &VarZeroSlice<T, F>

Dereferences the value.

impl<'a, T: ?Sized + VarULE, F: VarZeroVecFormat> From<&'a VarZeroSlice<T, F>> for VarZeroVecOwned<T, F>

fn from(other: &'a VarZeroSlice<T, F>) -> Self

Converts to this type from the input type.

impl<'a, T: ?Sized + VarULE, F: VarZeroVecFormat> From<VarZeroVec<'a, T, F>> for VarZeroVecOwned<T, F>

fn from(other: VarZeroVec<'a, T, F>) -> Self

Converts to this type from the input type.

impl<'a, T: ?Sized, F> From<VarZeroVecOwned<T, F>> for VarZeroVec<'a, T, F>

fn from(other: VarZeroVecOwned<T, F>) -> Self

Converts to this type from the input type.

impl<T, A, F> PartialEq<&[A]> for VarZeroVecOwned<T, F>

where T: VarULE + ?Sized + PartialEq, A: AsRef<T>, F: VarZeroVecFormat,

fn eq(&self, other: &&[A]) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.