/* Code for exercise 8.6. |  | "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. `----------------------------------------------------------------------*/#include <iostream>#include <string>#include <cstdlib>#include <ctime>int level;void f_without_string(int throw_level) {   ++level;   if (throw_level==level)      throw level;   else      f_without_string(throw_level);}void f_with_string(int throw_level) {   std::string s;   ++level;   if (throw_level==level)      throw level;   else      f_with_string(throw_level);}int main(int argc, char* argv[]) {   int throw_level = (argc<2 or std::atoi(argv[1])<1)?                     0: std::atoi(argv[1]);   unsigned long catch_count = 0;   std::clock_t end = std::clock()+5*CLOCKS_PER_SEC;   do {      level = 0;      try {         if (throw_level==0)            throw 0;         else            f_without_string(throw_level);      } catch (int depth) {         ++catch_count;      }   } while (std::clock()<end);   std::cout << "Without string: " << catch_count/5                                   << " catches/second.\n";   catch_count = 0;   end = std::clock()+5*CLOCKS_PER_SEC;   do {      level = 0;      try {         if (throw_level==0)            throw 0;         else            f_with_string(throw_level);      } catch (int depth) {         ++catch_count;      }   } while (std::clock()<end);   std::cout << "With string: " << catch_count/5                                << " catches/second\n";   return 0;}