C++ Builder 中怎么使用Hash_map,hash_set

#include <hash_map>
#include <map>
#include <vector>
#include <Generics.collections.hpp>
#include  <iostream>

 hash_map<const char*, int, hash<const char*>, eqstr> months;

  months["january"] = 31;
  months["february"] = 28;
  months["march"] = 31;
  months["april"] = 30;
  months["may"] = 31;
  months["june"] = 30;
  months["july"] = 31;
  months["august"] = 31;
  months["september"] = 30;
  months["october"] = 31;
  months["november"] = 30;
  months["december"] = 31;

编译报错 hash_map报错。
[解决办法]
在help中一搜THashedStringlist不就马上有结果了嘛
inifiles.hpp
[解决办法]
没有加名字空间
using namespace std;