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<?php namespace Ds\Traits; /** * Common to structures that require a capacity which is a power of two. / trait SquaredCapacity { use Capacity; /* * Rounds an integer to the next power of two if not already a power of two. * * @param int $capacity * * @return int / private function square(int $capacity): int { return pow(2, ceil(log($capacity, 2))); } /* * Ensures that enough memory is allocated for a specified capacity. This * potentially reduces the number of reallocations as the size increases. * * @param int $capacity The number of values for which capacity should be * allocated. Capacity will stay the same if this value * is less than or equal to the current capacity. / public function allocate(int $capacity) { $this->capacity = max($this->square($capacity), $this->capacity); } /* * Called when capacity should be increased to accommodate new values. / protected function increaseCapacity() { $this->capacity = $this->square( max( count($this) + 1, $this->capacity $this->getGrowthFactor() ) ); } /** * @param int $total */ protected function ensureCapacity(int $total) { while ($total > $this->capacity()) { $this->increaseCapacity(); } } }

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