/* Code for exercise 4.6. |  | "C++ Solutions--Companion to The C++ Programming Language, Third Edition" | by David Vandevoorde; Addison-Wesley 1998; ISBN 0-201-30965-3. | | Permission to use, copy, modify, distribute and sell this software | and its documentation for any purpose is hereby granted without fee. | The author makes no representations about the suitability of this | software for any purpose.  It is provided "as is" without express or | implied warranty. `----------------------------------------------------------------------*//*This file may cause all sorts of problems for various compilers andassociated tools. Here is one message of a compiler that attemptedprocessing of this file. It speaks for itself:   External symbol too long, truncated from 14328 to 4000 bytes,   f__FP8DoublifyXT8DoublifyXT8DoublifyXT8DoublifyXT8DoublifyXT8DoublifyXT8Dou   blifyXT8DoublifyXT8DoublifyXT8DoublifyXTdTd_T8Doublif...*/template<typename T, typename U>struct Doublify {};template<int N>struct Exponential {   typedef Doublify<typename Exponential<N-1>::LongType,                    typename Exponential<N-1>::LongType>           LongType;};template<>struct Exponential<0> {   typedef double LongType;};int f(Exponential<10>::LongType*) {   return 3;}