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