BlockPool.php

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<?php
namespace Magento\Framework\View;

use Magento\Framework\View\Element\BlockFactory;
use Magento\Framework\View\Element\BlockInterface;

class BlockPool
{
    protected $blockFactory;

    protected $blocks = [];

    public function __construct(BlockFactory $blockFactory)
    {
        $this->blockFactory = $blockFactory;
    }

    public function add($name, $class, array $arguments = [])
    {
        if (!class_exists($class)) {
            throw new \InvalidArgumentException(
                (string)new \Magento\Framework\Phrase('Invalid Block class name: %1', [$class])
            );
        }

        $block = $this->blockFactory->createBlock($class, $arguments);

        $this->blocks[$name] = $block;

        return $this;
    }

    public function get($name = null)
    {
        if (!isset($name)) {
            return $this->blocks;
        }

        return $this->blocks[$name] ?? null;
    }
}