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<?php namespace PhpOffice\PhpSpreadsheet\Calculation\Engine; class CyclicReferenceStack { /** * The call stack for calculated cells. * * @var mixed[] */ private $stack = []; /** * Return the number of entries on the stack. * * @return int */ public function count() { return count($this->stack); } /** * Push a new entry onto the stack. * * @param mixed $value */ public function push($value): void { $this->stack[$value] = $value; } /** * Pop the last entry from the stack. * * @return mixed */ public function pop() { return array_pop($this->stack); } /** * Test to see if a specified entry exists on the stack. * * @param mixed $value The value to test * * @return bool */ public function onStack($value) { return isset($this->stack[$value]); } /** * Clear the stack. */ public function clear(): void { $this->stack = []; } /** * Return an array of all entries on the stack. * * @return mixed[] */ public function showStack() { return $this->stack; } }