Random\Engine\Xoshiro256StarStar::jump

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Random\Engine\Xoshiro256StarStar::jump — Efficiently move the engine ahead by 2^128 steps

Descrizione

public Random\Engine\Xoshiro256StarStar::jump(): void

Moves the algorithm’s state ahead by 2¹²⁸ steps, as if Random\Engine\Xoshiro256StarStar::generate() was called 2¹²⁸ times.

The purpose of a jump is to facilitate the creation of a new Random\Engine\Xoshiro256StarStar engine from an existing seeded Random\Engine\Xoshiro256StarStar engine. The seeded engine acts as a blueprint, which can be cloned and repeatedly jumped to create 2¹²⁸ non-overlapping sequences with 2¹²⁸ values each.

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

Nessun valore viene restituito.

Esempi

Example #1 Random\Engine\Xoshiro256StarStar::jump() example

<?php
use Random\Engine\Xoshiro256StarStar;
use Random\Randomizer;

$blueprintRng = new Xoshiro256StarStar(0);

$fibers = [];
for ($i = 0; $i < 8; $i++) {
    $fiberRng = clone $blueprintRng;
    $blueprintRng->jump();

    $fiber = new Fiber(static function () use ($fiberRng, $i): void {
        $randomizer = new Randomizer($fiberRng);

        while (true) {
            Fiber::suspend();

            echo "{$i}: ", $randomizer->getInt(0, 100), "\n";
        }
    });
    $fiber->start();

    $fibers[] = $fiber;
}

// Even though the fibers execute in a random order, they will print the same value
// each time, because each has its own unique instance of the RNG.
$randomizer = new Randomizer();

$fibers = $randomizer->shuffleArray($fibers);
foreach ($fibers as $fiber) {
    $fiber->resume();
}

$fibers = $randomizer->shuffleArray($fibers);
foreach ($fibers as $fiber) {
    $fiber->resume();
}
?>

Il precedente esempio visualizzerà qualcosa simile a:

Vedere anche:

Random\Engine\Xoshiro256StarStar::jumpLong() - Efficiently move the engine ahead by 2^192 steps

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