PHPKonf 2020 Online

The Deque class

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简介

A Deque (pronounced “deck”) is a sequence of values in a contiguous buffer that grows and shrinks automatically. The name is a common abbreviation of “double-ended queue” and is used internally by Ds\Queue.

Two pointers are used to keep track of a head and a tail. The pointers can “wrap around” the end of the buffer, which avoids the need to move other values around to make room. This makes shift and unshift very fast —  something a Ds\Vector can’t compete with.

Accessing a value by index requires a translation between the index and its corresponding position in the buffer: ((head + position) % capacity).

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.
  • get(), set(), push(), pop(), shift(), and unshift() are all O(1).

Weaknesses

  • Capacity must be a power of 2.
  • insert() and remove() are O(n).

类摘要

Ds\Deque implements Ds\Sequence , ArrayAccess {
/* Constants */
const int MIN_CAPACITY = 8 ;
/* 方法 */
public allocate ( int $capacity ) : void
public apply ( callable $callback ) : void
public capacity ( ) : int
public clear ( ) : void
public contains ( mixed ...$values ) : bool
public copy ( ) : Ds\Deque
public filter ([ callable $callback ] ) : Ds\Deque
public find ( mixed $value ) : mixed
public first ( ) : mixed
public get ( int $index ) : mixed
public insert ( int $index , mixed ...$values ) : void
public isEmpty ( ) : bool
public join ([ string $glue ] ) : string
public last ( ) : mixed
public map ( callable $callback ) : Ds\Deque
public merge ( mixed $values ) : Ds\Deque
public pop ( ) : mixed
public push ( mixed ...$values ) : void
public reduce ( callable $callback [, mixed $initial ] ) : mixed
public remove ( int $index ) : mixed
public reverse ( ) : void
public reversed ( ) : Ds\Deque
public rotate ( int $rotations ) : void
public set ( int $index , mixed $value ) : void
public shift ( ) : mixed
public slice ( int $index [, int $length ] ) : Ds\Deque
public sort ([ callable $comparator ] ) : void
public sorted ([ callable $comparator ] ) : Ds\Deque
public sum ( ) : int|float
public toArray ( ) : array
public unshift ([ mixed $values ] ) : void
}

预定义常量

Ds\Deque::MIN_CAPACITY

更新日志

版本 说明
PECL ds 1.3.0 The class now implements ArrayAccess.

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