How to use SGI STL hash_map?

I have used it several times with no problem, although I have used it with gcc (on both windows and linux) and not Visual Studio.

For actual use, the documentation is here .

You can specify how many reserves to reserve with

void resize(size_type n)

      

        
        
        
      

    

Regarding your problem with the ID T, I assume you forgot to replace the template argument named T with the actual type. If you can't figure it out, maybe paste in a piece of code on how you are using hash_map.

Example from the documentation:

#include <hash_map>
#include <iostream>

struct eqstr
{
  bool operator()(const char* s1, const char* s2) const
  {
    return strcmp(s1, s2) == 0;
  }
};

int main()
{
  std::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;

  std::cout << "september -> " << months["september"] << endl;
  std::cout << "april     -> " << months["april"] << endl;
  std::cout << "june      -> " << months["june"] << endl;
  std::cout << "november  -> " << months["november"] << endl;
}

      

        
        
        
      

    

You can of course use std :: string instead of char * if you like:

std::hash_map<std::string, int, hash<std::string>, eqstr> months;