I am running gcc version 3.2.2 20030222 (Red Hat Linux
3.2.2-5).

I am a relative newbee to c++ (haven't used it in a
while).

In my .h file:

#include <ext/hash_map>

class HTEntry {
public:
double time;
double ttl;
};


typedef hash_map<int, pair<int,HTEntry>, hash<int>,
equal_to<int> > HMap;


class Hash_Table
{
public:
void increment(int, double, double);
int lookup(int,double,double);
int findsize(double,bool);
int estimate_hit(double);
protected:
HMap flows;
};



In the .cc file:
#include <iostream>
#include <sstream>
#include <cmath>
#include <valarray>
#include <string>
#include <sys/types.h>
#include "config.h"
#include "template.h"
#include "flags.h"
#include "delay.h"
#include "rd.h"

using namespace std;

void Hash_Table::increment(int id, double t_now,
double ttl)
{
HMap::iterator iter;
iter=flows.find(id);
double timelived, thresh;
int hits;
// bunch of stuff
}

//other functions that I leave out.

Errors:
In file included from qd.cc:78:
qd.h:154: `hash' was not declared in this scope
qd.h:154: parse error before `>' token
qd.h:173: 'HMap' is used as a type, but is not defined
as a type.
qd.cc: In member function `void
Hash_Table::increment(int, double, double)':
qd.cc:1232: `HMap' undeclared (first use this
function)
qd.cc:1232: (Each undeclared identifier is reported
only once for each
function it appears in.)
qd.cc:1232: parse error before `::' token
qd.cc:1233: `iter' undeclared (first use this
function)
qd.cc:1233: `flows' undeclared (first use this
function)
qd.cc: In member function `int
Hash_Table::findsize(double, bool)':
qd.cc:1274: parse error before `::' token
qd.cc: In member function `int Hash_Table::lookup(int,
double, double)':
qd.cc:1360: parse error before `::' token
make: *** [qd.o] Error 1

Similar errors for other functions removed for
simplicity.

Any help is appreciated.

what are you trying to accomplish?

hash_map is an extension to the c++ standard library that ships with gcc (as you can see by how it's included), and extensions to libstdc++ live in the __gnu_cxx namespace.

So your typedef in the header should be:
Also, for std::pair you need to include <utility> either directly or indirectly.

Hivemind,

Thanks for the useful info. I could get it to compile now.

The code is part of a large system. So, just getting started..

thanks.