#include <iostream>

 #include <map>

 #include <string>

 using  namespace std;

 struct value{

     int i;

     std::string test;

 };

 int main()

 {

     std::map<int, value*> test_map;

     for(int i=; i<; ++i){

         value* tmp = new value();

         tmp->i = i;

         tmp->test = "test";

         test_map.insert(make_pair(i, tmp));

     }   

     for(std::map<int, value*>::iterator it=test_map.begin(); it!=test_map.end();){

         std::cout << "first " << it->first << " second " << (it->second)->i <<" "<< (it->second)->test << std::endl;

         delete it->second;

         it->second = NULL;
//test_map.erase(it);     //迭代器失效；
   test_map.erase(it++);   //防止迭代器失效，切记、切记

     }   

     return ;

 }

 root@u18:~/cp/test# g++ map3.cpp  -g -Wall

 root@u18:~/cp/test# ls -lt a.out

 -rwxr-xr-x  root root  Jul   : a.out

 root@u18:~/cp/test# valgrind  --tool=memcheck  --leak-check=full ./a.out

 ==== Memcheck, a memory error detector

 ==== Copyright (C) -, and GNU GPL'd, by Julian Seward et al.

 ==== Using Valgrind-3.7. and LibVEX; rerun with -h for copyright info

 ==== Command: ./a.out

 ====

 first  second  test

 first  second  test

 first  second  test

 first  second  test

 first  second  test

 first  second  test

 first  second  test

 first  second  test

 first  second  test

 first  second  test

 ====

 ==== HEAP SUMMARY:

 ====     in use at exit:  bytes in  blocks

 ====   total heap usage:  allocs,  frees,  bytes allocated

 ====

 ==== All heap blocks were freed -- no leaks are possible

 ====

 ==== For counts of detected and suppressed errors, rerun with: -v

 ==== ERROR SUMMARY:  errors from  contexts (suppressed:  from )