/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <iostream>#include <cstring>#include <string>// maximum of two values of any type (call-by-reference)template <typename T>inline T const& max (T const& a, T const& b){    return  a < b  ?  b : a;}// maximum of two C-strings (call-by-value)inline char const* max (char const* a, char const* b){     return  std::strcmp(a,b) < 0  ?  b : a;}// maximum of three values of any type (call-by-reference)template <typename T>inline T const& max (T const& a, T const& b, T const& c){    return max (max(a,b), c);  // error, if max(a,b) uses call-by-value}int main (){    ::max(7, 42, 68);     // OK    const char* s1 = "frederic";    const char* s2 = "anica";    const char* s3 = "lucas";    ::max(s1, s2, s3);    // ERROR}