Method deallocate_string

UnitTests/TestApp/pugixml.cpp:447–464

	}

	void deallocate_string(char_t* string)
	{
		// this function casts pointers through void* to avoid 'cast increases required alignment of target type' warnings
		// we're guaranteed the proper (pointer-sized) alignment on the input string if it was allocated via allocate_string

		// get header
		xml_memory_string_header* header = static_cast<xml_memory_string_header*>(static_cast<void*>(string)) - 1;

		// deallocate
		size_t page_offset = offsetof(xml_memory_page, data) + header->page_offset;
		xml_memory_page* page =
			reinterpret_cast<xml_memory_page*>(static_cast<void*>(reinterpret_cast<char*>(header) - page_offset));

		// if full_size == 0 then this string occupies the whole page
		size_t full_size = header->full_size == 0 ? page->busy_size : header->full_size;

		deallocate_memory(header, full_size, page);
	}

	xml_memory_page* _root;
	size_t _busy_size;