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Saturday, 16 October, 2021

Rust For Vec

author
Danielle Fletcher
• Saturday, 09 January, 2021
• 24 min read

Returns a mutable pointer to the first element of the slice, or None if it is empty. Returns the first and all the rest of the elements of the slice, or None if it is empty.

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Contents

Returns the first and all the rest of the elements of the slice, or None if it is empty. Returns the last and all the rest of the elements of the slice, or None if it is empty.

Returns the last and all the rest of the elements of the slice, or None if it is empty. Returns a mutable pointer to the last item in the slice.

Returns a reference to an element or subs lice depending on the type of index. Returns a reference to an element or subs lice, without doing bounds checking.

Calling this method with an out-of-bounds index is undefined behavior even if the resulting reference is not used. Returns a mutable reference to an element or subs lice, without doing bounds checking.

Calling this method with an out-of-bounds index is undefined behavior even if the resulting reference is not used. Returns a raw pointer to the slice's buffer.

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The caller must ensure that the slice outlives the pointer this function returns, or else it will end up pointing to garbage. Modifying the container referenced by this slice may cause it's buffer to be reallocated, which would also make any pointers to it invalid.

Returns an unsafe mutable pointer to the slice's buffer. The caller must ensure that the slice outlives the pointer this function returns, or else it will end up pointing to garbage.

Modifying the container referenced by this slice may cause it's buffer to be reallocated, which would also make any pointers to it invalid. Returns the two raw pointers spanning the slice.

The returned range is half-open, which means that the end pointer points one past the last element of the slice. The end pointer requires extra caution, as it does not point to a valid element in the slice.

This function is useful for interacting with foreign interfaces which use two pointers to refer to a range of elements in memory, as is common in C++. Returns the two unsafe mutable pointers spanning the slice.

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The returned range is half-open, which means that the end pointer points one past the last element of the slice. The end pointer requires extra caution, as it does not point to a valid element in the slice.

This function is useful for interacting with foreign interfaces which use two pointers to refer to a range of elements in memory, as is common in C++. Returns an iterator that allows modifying each value.

Returns an iterator over all contiguous windows of length size. If the slice is shorter than size, the iterator returns no values.

If chunk_size does not divide the length of the slice, then the last up to chunk_size-1 elements will be omitted and can be retrieved from the remainder function of the iterator. If chunk_size does not divide the length of the slice, then the last up to chunk_size-1 elements will be omitted and can be retrieved from the into_remainder function of the iterator.

Due to each chunk having exactly chunk_size elements, the compiler can often optimize the resulting code better than in the case of chunks_mut. This check will most probably get changed to a compile time error before this method gets stabilized.

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If N does not divide the length of the slice, then the last up to N-1 elements will be omitted and can be retrieved from the remainder function of the iterator. This check will most probably get changed to a compile time error before this method gets stabilized.

This check will most probably get changed to a compile time error before this method gets stabilized. The chunks are mutable array references and do not overlap.

If N does not divide the length of the slice, then the last up to N-1 elements will be omitted and can be retrieved from the into_remainder function of the iterator. This check will most probably get changed to a compile time error before this method gets stabilized.

If N is greater than the size of the slice, it will return no windows. This check will most probably get changed to a compile time error before this method gets stabilized.

If chunk_size does not divide the length of the slice, then the last up to chunk_size-1 elements will be omitted and can be retrieved from the remainder function of the iterator. If chunk_size does not divide the length of the slice, then the last up to chunk_size-1 elements will be omitted and can be retrieved from the into_remainder function of the iterator.

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Due to each chunk having exactly chunk_size elements, the compiler can often optimize the resulting code better than in the case of chunks_mut. Pub FN split (self, red: F) Split <'_, T, F>where F: Input (& T) built, Returns an iterator over subslices separated by elements that match red.

Returns an iterator over mutable subslices separated by elements that match red. Returns an iterator over subslices separated by elements that match red.

The matched element is contained in the end of the previous subs lice as a terminator. Returns an iterator over mutable subslices separated by elements that match red.

The matched element is contained in the previous subs lice as a terminator. Pub FN split (self, red: F) Split <'_, T, F>where F: Input (& T) built, 1.27.0 Returns an iterator over subslices separated by elements that match red, starting at the end of the slice and working backwards.

As with split(), if the first or last element is matched, an empty slice will be the first (or last) item returned by the iterator. Returns an iterator over mutable subslices separated by elements that match red, starting at the end of the slice and working backwards.

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Pub FN split (self, n: size, red: F) Split <'_, T, F>where F: Input (& T) built, Returns an iterator over subslices separated by elements that match red, limited to returning at most n items. The last element returned, if any, will contain the remainder of the slice.

Print the slice split once by numbers divisible by 3 (i.e., , ): The last element returned, if any, will contain the remainder of the slice.

This starts at the end of the slice and works backwards. The last element returned, if any, will contain the remainder of the slice.

Print the slice split once, starting from the end, by numbers divisible by 3 (i.e., , ): This starts at the end of the slice and works backwards.

The last element returned, if any, will contain the remainder of the slice. Returns true if the slice contains an element with the given value.

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#pub FN strip_prefix (self, prefix: &) Option < & > where T: Partial , This is a nightly-only experimental API. If prefix is empty, simply returns the original slice.

#pub FN strip_suffix (self, suffix: &) Option < & > where T: Partial , This is a nightly-only experimental API. If suffix is empty, simply returns the original slice.

If the value is found then Result::Ok is returned, containing the index of the matching element. If the value is not found then Result::Err is returned, containing the index where a matching element could be inserted while maintaining sorted order.

Binary searches this sorted slice with a comparator function. If the value is found then Result::Ok is returned, containing the index of the matching element.

If the value is not found then Result::Err is returned, containing the index where a matching element could be inserted while maintaining sorted order. Pub FN <'a, B, F>(&'a self, b: & B, f: F) Result < size, size > where B: ORD, F: Input (&'a T) B, 1.10.0 Binary searches this sorted slice with a key extraction function.

If the value is found then Result::Ok is returned, containing the index of the matching element. If the value is not found then Result::Err is returned, containing the index where a matching element could be inserted while maintaining sorted order.

Sorts the slice, but may not preserve the order of equal elements. This sort is unstable (i.e., may reorder equal elements), in-place (i.e., does not allocate), and O (n * log(n)) worst-case.

The current algorithm is based on pattern-defeating quick sort by Orson Peters, which combines the fast average case of randomized quick sort with the fast worst case of heap sort, while achieving linear time on slices with certain patterns. It uses some randomization to avoid degenerate cases, but with a fixed seed to always provide deterministic behavior.

Sorts the slice with a comparator function, but may not preserve the order of equal elements. This sort is unstable (i.e., may reorder equal elements), in-place (i.e., does not allocate), and O (n * log(n)) worst-case.

The comparator function must define a total ordering for the elements in the slice. Total and antisymmetric: exactly one of a < b, a == b or a > b is true, and transitive, a < b and b < c implies a < c.

The current algorithm is based on pattern-defeating quick sort by Orson Peters, which combines the fast average case of randomized quick sort with the fast worst case of heap sort, while achieving linear time on slices with certain patterns. It uses some randomization to avoid degenerate cases, but with a fixed seed to always provide deterministic behavior.

Pub FN (smut self, f: F) where F: Input (& T) K, K: ORD, 1.20.0 Sorts the slice with a key extraction function, but may not preserve the order of equal elements. This sort is unstable (i.e., may reorder equal elements), in-place (i.e., does not allocate), and O (m × n * log(n)) worst-case, where the key function is O (m).

The current algorithm is based on pattern-defeating quick sort by Orson Peters, which combines the fast average case of randomized quick sort with the fast worst case of heap sort, while achieving linear time on slices with certain patterns. It uses some randomization to avoid degenerate cases, but with a fixed seed to always provide deterministic behavior.

Reorder the slice such that the element at index is at its final sorted position. Reorder the slice with a comparator function such that the element at index is at its final sorted position.

Reorder the slice with a key extraction function such that the element at index is at its final sorted position. Reorder the slice such that the element at index is at its final sorted position.

Additionally, this reordering is unstable (i.e. any number of equal elements may end up at position index), in-place (i.e. does not allocate), and O (n) worst-case. Reorder the slice with a comparator function such that the element at index is at its final sorted position.

This reordering has the additional property that any value at position i < index will be less than or equal to any value at a position j > index using the comparator function. Additionally, this reordering is unstable (i.e. any number of equal elements may end up at position index), in-place (i.e. does not allocate), and O (n) worst-case.

Reorder the slice with a key extraction function such that the element at index is at its final sorted position. This reordering has the additional property that any value at position i < index will be less than or equal to any value at a position j > index using the key extraction function.

Additionally, this reordering is unstable (i.e. any number of equal elements may end up at position index), in-place (i.e. does not allocate), and O (n) worst-case. Moves all consecutive repeated elements to the end of the slice according to the Partial trait implementation.

Moves all but the first of consecutive elements to the end of the slice satisfying a given equality relation. Moves all but the first of consecutive elements to the end of the slice that resolve to the same key.

This function will panic if k is greater than the length of the slice. Pub FN fill (smut self, value: T) where T: Clone, This is a nightly-only experimental API.

Dest is the starting index of the range within self to copy to, which will have the same length as src. This function will panic if the two slices have different lengths.

To work around this, we can use split_at_but to create two distinct mutable sub-slices from a slice: The method may make the middle slice the greatest length possible for a given type and input slice, but only your algorithm's performance should depend on that, not its correctness.

It is permissible for all the input data to be returned as the prefix or suffix slice. This method is essentially a transmute with respect to the elements in the returned middle slice, so all the usual caveats pertaining to transmute:: also apply here.

The method may make the middle slice the greatest length possible for a given type and input slice, but only your algorithm's performance should depend on that, not its correctness. It is permissible for all the input data to be returned as the prefix or suffix slice.

This method is essentially a transmute with respect to the elements in the returned middle slice, so all the usual caveats pertaining to transmute:: also apply here. If the slice yields exactly zero or one element, true is returned.

Note that if Self::Item is only Partial, but not ORD, the above definition implies that this function returns false if any two consecutive items are not comparable. Checks if the elements of this slice are sorted using the given comparator function.

Checks if the elements of this slice are sorted using the given key extraction function. This means that all elements for which the predicate returns true are at the start of the slice and all elements for which the predicate returns false are at the end.

For example, is a partitioned under the predicate x % 2 != 0 (all odd numbers are at the start, all even at the end). If this slice is not partitioned, the returned result is unspecified and meaningless, as this method performs a kind of binary search.

The vector will be able to hold exactly capacity elements without reallocating. Returns the raw pointer to the underlying data, the length of the vector (in elements), and the allocated capacity of the data (in elements).

After calling this function, the caller is responsible for the memory previously managed by the DEC. The only way to do this is to convert the raw pointer, length, and capacity back into a DEC with the from_raw_parts function, allowing the destruct or to perform the cleanup.

Violating these may cause problems like corrupting the allocator's internal data structures. For example, it is not safe to build a DEC from a pointer to a C char array with length size_t.

The ownership of PTR is effectively transferred to the DEC which may then reallocate, reallocate or change the contents of memory pointed to by the pointer at will. Returns the number of elements the vector can hold without reallocating.

Reserves capacity for at least additional more elements to be inserted in the given DEC . The collection may reserve more space to avoid frequent reallocation.

After calling reserve, capacity will be greater than or equal to self.Len() + additional. Panics if the new capacity exceeds size::MAX bytes.

Reserves the minimum capacity for exactly additional more elements to be inserted in the given DEC . After calling reserve_exact, capacity will be greater than or equal to self.Len() + additional.

Note that the allocator may give the collection more space than it requests. Prefer reserve if future insertions are expected.

Tries to reserve capacity for at least additional more elements to be inserted in the given DEC . The collection may reserve more space to avoid frequent reallocation.

After calling try_reserve, capacity will be greater than or equal to self.Len() + additional. If the capacity overflows, or the allocator reports a failure, then an error is returned.

Tries to reserve the minimum capacity for exactly additional elements to be inserted in the given DEC . After calling try_reserve_exact, capacity will be greater than or equal to self.Len() + additional if it returns Ok(()).

Note that the allocator may give the collection more space than it requests. Prefer reserve if future insertions are expected.

If the capacity overflows, or the allocator reports a failure, then an error is returned. It will drop as close as possible to the length but the allocator may still inform the vector that there is space for a few more elements.

Shrinks the capacity of the vector with a lower bound. The capacity will remain at least as large as both the length and the supplied value.

Shortens the vector, keeping the first Len elements and dropping the rest. If Len is greater than the vector's current length, this has no effect.

The drain method can emulate truncate, but causes the excess elements to be returned instead of dropped. Note that this method has no effect on the allocated capacity of the vector.

No truncation occurs when Len is greater than the vector's current length: Truncating when Len == 0 is equivalent to calling the clear method.

The caller must ensure that the vector outlives the pointer this function returns, or else it will end up pointing to garbage. Modifying the vector may cause it's buffer to be reallocated, which would also make any pointers to it invalid.

Returns an unsafe mutable pointer to the vector's buffer. The caller must ensure that the vector outlives the pointer this function returns, or else it will end up pointing to garbage.

Modifying the vector may cause it's buffer to be reallocated, which would also make any pointers to it invalid. Pub unsafe FN set_len (smut self, new_len: size) Forces the length of the vector to new_len.

This is a low-level operation that maintains none of the normal invariants of the type. Normally changing the length of a vector is done using one of the safe operations instead, such as truncate, resize, extend, or clear.

Normally, here, one would use clear instead to correctly drop the contents and thus not leak memory. This method operates in place, visiting each element exactly once in the original order, and preserves the order of the retained elements.

The exact order may be useful for tracking external state, like an index. Removes all but the first of consecutive elements in the vector that resolve to the same key.

Pub FN push (smut self, value: T) Appends an element to the back of a collection. Panics if the new capacity exceeds size::MAX bytes.

Removes the last element from a vector and returns it, or None if it is empty. Panics if the number of elements in the vector overflows an size.

If the iterator is not dropped (with me::forget for example), it is unspecified how many elements are removed. Note that this method has no effect on the allocated capacity of the vector.

Returns the number of elements in the vector, also referred to as its 'length'. Returns true if the vector contains no elements.

#pub FN split_off (smut self, at: size) DEC 1.4.0 Splits the collection into two at the given index. Returns a newly allocated vector containing the elements in the range [at, Len).

After the call, the original vector will be left containing the elements [0, at) with its previous capacity unchanged. Pub FN resize_with (smut self, new_len: size, f: F) where F: Input () T, 1.33.0 Resizes the DEC in-place so that Len is equal to new_len.

If new_len is greater than Len, the DEC is extended by the difference, with each additional slot filled with the result of calling the closure f. The return values from f will end up in the DEC in the order they have been generated.

Consumes and leaks the DEC, returning a mutable reference to the contents, &'a but . Note that the type T must outlive the chosen lifetime 'a.

This function is mainly useful for data that lives for the remainder of the program's life. Dropping the returned reference will cause a memory leak.

Returns the remaining spare capacity of the vector as a slice of MaybeUninit. If new_len is greater than Len, the DEC is extended by the difference, with each additional slot filled with value.

If you need more flexibility (or want to rely on Default instead of Clone), use DEC ::resize_with. Iterates over the slice other, clones each element, and then appends it to this DEC.

Note that this function is same as extend except that it is specialized to work with slices instead. Removes consecutive repeated elements in the vector according to the Partial trait implementation.

Deprecated since 1.46.0: Removing the first item equal to a needle is already easily possible with iterators and the current VDECmethods. Range is removed even if the iterator is not consumed until the end.

It is unspecified how many elements are removed from the vector if the Splice value is leaked. The input iterator replace_with is only consumed when the Splice value is dropped.

The tail (elements in the vector after range) is empty, or replace_with yields fewer elements than range ’s length or the lower bound of its size_hint() is exact. Creates an iterator which uses a closure to determine if an element should be removed.

If the closure returns true, then the element is removed and yielded. If the closure returns false, the element will remain in the vector and will not be yielded by the iterator.

Checks if all bytes in this slice are within the ASCII range. Pub FN (self, other: &) built 1.23.0 Checks that two slices are an ASCII case-insensitive match.

Pub FN (smut self) 1.23.0 Converts this slice to its ASCII upper case equivalent in-place. To return a new uppercase value without modifying the existing one, use to_ascii_uppercase.

Pub FN (smut self) 1.23.0 Converts this slice to its ASCII lower case equivalent in-place. To return a new lowercase value without modifying the existing one, use to_ascii_lowercase.

The current algorithm is an adaptive, iterative merge sort inspired by import. Also, it allocates temporary storage half the size of self, but for short slices a non-allocating insertion sort is used instead.

This sort is stable (i.e., does not reorder equal elements) and O (n * log(n)) worst-case. The comparator function must define a total ordering for the elements in the slice.

Total and antisymmetric: exactly one of a < b, a == b or a > b is true, and transitive, a < b and b < c implies a < c. The current algorithm is an adaptive, iterative merge sort inspired by import.

Also, it allocates temporary storage half the size of self, but for short slices a non-allocating insertion sort is used instead. Pub FN sort_by_key (smut self, f: F) where F: Input (& T) K, K: ORD, 1.7.0 Sorts the slice with a key extraction function.

This sort is stable (i.e., does not reorder equal elements) and O (m × n * log(n)) worst-case, where the key function is O (m). For expensive key functions (e.g. functions that are not simple property accesses or basic operations), sort_by_cached_key is likely to be significantly faster, as it does not recompute element keys.

The current algorithm is an adaptive, iterative merge sort inspired by import. Also, it allocates temporary storage half the size of self, but for short slices a non-allocating insertion sort is used instead.

This sort is stable (i.e., does not reorder equal elements) and O (m × n + n * log(n)) worst-case, where the key function is O (m). The current algorithm is based on pattern-defeating quick sort by Orson Peters, which combines the fast average case of randomized quick sort with the fast worst case of heap sort, while achieving linear time on slices with certain patterns.

It uses some randomization to avoid degenerate cases, but with a fixed seed to always provide deterministic behavior. In the worst case, the algorithm allocates temporary storage in a DEC <(K, size)> the length of the slice.

Returns a vector containing a copy of this slice where each byte is mapped to its ASCII upper case equivalent. Returns a vector containing a copy of this slice where each byte is mapped to its ASCII lower case equivalent.

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