Method create

Tools/EditorFramework/pugixml.cpp:5709–5733

	}

	PUGI__FN void xml_document::create()
	{
		// initialize sentinel page
		PUGI__STATIC_ASSERT(
			offsetof(impl::xml_memory_page, data) + sizeof(impl::xml_document_struct) +
				impl::xml_memory_page_alignment <=
			sizeof(_memory));

		// align upwards to page boundary
		void* page_memory = reinterpret_cast<void*>(
			(reinterpret_cast<uintptr_t>(_memory) + (impl::xml_memory_page_alignment - 1)) &
			~(impl::xml_memory_page_alignment - 1));

		// prepare page structure
		impl::xml_memory_page* page = impl::xml_memory_page::construct(page_memory);

		page->busy_size = impl::xml_memory_page_size;

		// allocate new root
		_root = new (page->data) impl::xml_document_struct(page);
		_root->prev_sibling_c = _root;

		// setup sentinel page
		page->allocator = static_cast<impl::xml_document_struct*>(_root);
	}

	PUGI__FN void xml_document::destroy()
	{