String n = " 2";
	ASSERT(decode(4, 1, "one", 2, "two", 3, "three", "unknown" + n) == String("unknown 2"));

template <class T, class V>
constexpr const V& decode(const T& sel, const V& def)
{
	return def;
}

template <class T, class K, class V, typename... L>
constexpr const V& decode(const T& sel, const K& k, const V& v, const L& ...args)
{
	return sel == k ? v : decode(sel, args...);
}

template <class T>
constexpr const char *decode(const T& sel, const char *def)
{
	return def;
}

template <class T, class K, typename... L>
constexpr const char *decode(const T& sel, const K& k, const char *v, const L& ...args)
{
	return sel == k ? v : (const char *)decode(sel, args...);
}