Why would you remove the file that declares std::hash?
You need to leave that in and simply add the using statement.
corey
On Mon, 28 Mar 2005 09:59:54 -0800 (PST), Parms singh
<list_track@xxxxxxxxx> wrote:
> Corey,
>
> I did a couple of things:
> - Added the following as you suggested:
> using std::hash; in the .cc file.
>
> - Removed stl_hash_fun.h and tried to compile.
>
> I get the exact same errors as my original posting in
> both the cases.
>
> Parms
> --- corey taylor <corey.taylor@xxxxxxxxx> wrote:
> > Parms,
> >
> > You are using the stl_hash_fun.h header file so
> > hash is declared
> > inside the stl namespace. You need to fully qualify
> > it with the std::
> > namespace or add
> >
> > using std::hash;
> >
> > Beneath the includes.
> >
> > corey
> >
> > On Mon, 28 Mar 2005 09:29:10 -0800 (PST), Parms
> > singh
> > <list_track@xxxxxxxxx> wrote:
> > > Hello,
> > >
> > > 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/stl_hash_fun.h>
> > > #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.
> > >
> > >
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> >
>
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