int    FindFirstOf(int len, const tchar *s, int from) const;
int    FindFirstOf(const tchar *s, int from = 0) const;
int    FindFirstOf(const String& s, int from = 0) const   { return FindFirstOf(s.GetCount(), ~s, from); }

template <class B>
int AString<B>::FindFirstOf(int len, const tchar *s, int from) const
{
	ASSERT(from >= 0 && from <= GetLength());
	const tchar *ptr = B::Begin();
	const tchar *e = End();
	const tchar *se = s + (len * sizeof(tchar));
	for(const tchar *bs = ptr + from; bs < e; bs++)
		for(const tchar *ss = s; ss < se; ss++)
			if(*bs == *ss)
				return (int)(bs - ptr);
	return -1;
}
template <class B>
int AString<B>::FindFirstOf(const tchar *s, int from) const
{
	return FindFirstOf(strlen__(s), s, from);
}