The Vector class

(PECL ds >= 1.0.0)

はじめに

A Vector is a sequence of values in a contiguous buffer that grows and shrinks automatically. It’s the most efficient sequential structure because a value’s index is a direct mapping to its index in the buffer, and the growth factor isn't bound to a specific multiple or exponent.

Strengths

Supports array syntax (square brackets).
Uses less overall memory than an array for the same number of values.
Automatically frees allocated memory when its size drops low enough.
Capacity does not have to be a power of 2.
get(), set(), push(), pop() are all O(1).

Weaknesses

shift(), unshift(), insert() and remove() are all O(n).

クラス概要

class Ds\Vector implements Ds\Sequence, ArrayAccess {

/* 定数 */

const int MIN_CAPACITY = 8;

/* メソッド */

public function allocate(int $capacity): void

public function apply(callable $callback): void

public function capacity(): int

public function clear(): void

public function contains(mixed ...$values): bool

public function copy(): Ds\Vector

public function filter(callable $callback = ?): Ds\Vector

public function find(mixed $value): mixed

public function first(): mixed

public function get(int $index): mixed

public function insert(int $index, mixed ...$values): void

public function isEmpty(): bool

public function join(string $glue = ?): string

public function last(): mixed

public function map(callable $callback): Ds\Vector

public function merge(mixed $values): Ds\Vector

public function pop(): mixed

public function push(mixed ...$values): void

public function reduce(callable $callback, mixed $initial = ?): mixed

public function remove(int $index): mixed

public function reverse(): void

public function reversed(): Ds\Vector

public function rotate(int $rotations): void

public function set(int $index, mixed $value): void

public function shift(): mixed

public function slice(int $index, int $length = ?): Ds\Vector

public function sort(callable $comparator = ?): void

public function sorted(callable $comparator = ?): Ds\Vector

public function sum(): int|float

public function toArray(): array

public function unshift(mixed $values = ?): void

}

定義済み定数

Ds\Vector::MIN_CAPACITY

変更履歴

バージョン	説明
PECL ds 1.3.0	The class now implements ArrayAccess.
PECL ds 1.2.0	`Ds\Vector::MIN_CAPACITY` changed from 10 to 8.

Ds\Vector::allocate — Allocates enough memory for a required capacity
Ds\Vector::apply — Updates all values by applying a callback function to each value
Ds\Vector::capacity — Returns the current capacity
Ds\Vector::clear — Removes all values
Ds\Vector::__construct — Creates a new instance
Ds\Vector::contains — Determines if the vector contains given values
Ds\Vector::copy — Returns a shallow copy of the vector
Ds\Vector::count — Returns the number of values in the collection
Ds\Vector::filter — Creates a new vector using a callable to determine which values to include
Ds\Vector::find — Attempts to find a value's index
Ds\Vector::first — Returns the first value in the vector
Ds\Vector::get — Returns the value at a given index
Ds\Vector::insert — Inserts values at a given index
Ds\Vector::isEmpty — Returns whether the vector is empty
Ds\Vector::join — Joins all values together as a string
Ds\Vector::jsonSerialize — Returns a representation that can be converted to JSON
Ds\Vector::last — Returns the last value
Ds\Vector::map — Returns the result of applying a callback to each value
Ds\Vector::merge — Returns the result of adding all given values to the vector
Ds\Vector::pop — Removes and returns the last value
Ds\Vector::push — Adds values to the end of the vector
Ds\Vector::reduce — Reduces the vector to a single value using a callback function
Ds\Vector::remove — Removes and returns a value by index
Ds\Vector::reverse — Reverses the vector in-place
Ds\Vector::reversed — Returns a reversed copy
Ds\Vector::rotate — Rotates the vector by a given number of rotations
Ds\Vector::set — Updates a value at a given index
Ds\Vector::shift — Removes and returns the first value
Ds\Vector::slice — Returns a sub-vector of a given range
Ds\Vector::sort — Sorts the vector in-place
Ds\Vector::sorted — Returns a sorted copy
Ds\Vector::sum — Returns the sum of all values in the vector
Ds\Vector::toArray — Converts the vector to an array
Ds\Vector::unshift — Adds values to the front of the vector

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