/* Code for exercise 22.4. |  | "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 <map>#include <numeric>#include <string>typedef std::map<std::string, int> Tbl;void readitems(Tbl &m) {   std::string word;   int val = 0;   while (std::cin >> word >> val)      m[word] += val;}template<class T> struct Add2 {   int operator()(int a, T const &b) const {      return a+b.second;   }};int main() {   Tbl tbl;   readitems(tbl);   typedef Tbl::const_iterator const_iter;   for (const_iter p = tbl.begin(); p!=tbl.end(); ++p)      std::cout << p->first << '\t' << p->second << '\n';   std::cout << "----------------\ntotal\t"             << std::accumulate(tbl.begin(), tbl.end(), 0,                                Add2<Tbl::value_type>())             << '\n';   return !std::cin;}