Function align

Libs/sol/sol.hpp:9831–9846

		using unique_tag = detail::inheritance_unique_cast_function;

		inline void* align(std::size_t alignment, std::size_t size, void*& ptr, std::size_t& space, std::size_t& required_space) {
			// this handels arbitrary alignments...
			// make this into a power-of-2-only?
			// actually can't: this is a C++14-compatible framework,
			// power of 2 alignment is C++17
			std::uintptr_t initial = reinterpret_cast<std::uintptr_t>(ptr);
			std::uintptr_t offby = static_cast<std::uintptr_t>(initial % alignment);
			std::uintptr_t padding = (alignment - offby) % alignment;
			required_space += size + padding;
			if (space < required_space) {
				return nullptr;
			}
			ptr = static_cast<void*>(static_cast<char*>(ptr) + padding);
			space -= padding;
			return ptr;
		}

		inline void* align(std::size_t alignment, std::size_t size, void*& ptr, std::size_t& space) {
			std::size_t required_space = 0;