gcc-3.1 problem

["Tony, Zhou Jingtao" <zhoujing at figaro dot ddns dot comp dot nus dot edu dot sg>]

Doesn't the "g++" of "gcc-3.1" support "default argument"? I got an error when compiling the following program with it, while it ran fine with "gcc-3.0.4".

----------
StrTok.h:
----------
#ifndef __STRINGTOKENIZER_H__
#define __STRINGTOKENIZER_H__

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class StrTok
{
public:
   StrTok (string s, string delim = " ");

   inline bool hasMoreTokens() const {return (!sVec.empty ());}
   inline int countTokens() const {return sVec.size();}
   string nextToken ();

private:
   vector<string> sVec;
};

#endif

------------
StrTok.cpp:
------------
#include <StrTok.h>

StrTok::StrTok(string s, string delim = " ")
{
   // break s into many tokens with d
   // and store them into sVec

   string d = "\t\n" + delim;

   string::size_type pos = s.find_first_not_of(d);
   string::size_type prePos = pos;

   while ((pos = s.find_first_of(d, pos)) != string::npos) {
      sVec.push_back(s.substr(prePos, pos - prePos));
      pos = s.find_first_not_of(d, pos);
      prePos = pos;
   }

   if (pos > prePos) {
      sVec.push_back(s.substr(prePos, pos - prePos));
   }
}

string StrTok::nextToken()
{
   if (hasMoreTokens()) {
      string t = sVec[0];
      sVec.erase(sVec.begin(), sVec.begin() + 1);
      return t;
   } else
      return "";
}

----------
Makefile:
----------
CXX=g++
CXXFLAGS=-Wall -O2

prefix=/usr/local

object=StrTok.o
dobj=libStrTok.so.0.0.1
sobj=libStrTok.a


all: $(object) dynamic static

$(object): %.o:%.cpp
        $(CXX) -c $^ $(CXXFLAGS) -I.

dynamic:
        $(CXX) $(object) -o $(dobj) -shared

static:
        ar r libStrTok.a StrTok.o
        ranlib libStrTok.a


install:
        install -c $(dobj) $(prefix)/lib
        -rm $(prefix)/lib/libStrTok.so -f
        ln $(prefix)/lib/$(dobj) $(prefix)/lib/libStrTok.so -s
        install -c $(sobj) $(prefix)/lib
        install -c StrTok.h $(prefix)/include
        chmod 644 $(prefix)/lib/$(sobj)
        chmod 644 $(prefix)/include/StrTok.h

clean:
        rm -f $(object) $(dobj) $(sobj)

.PHONY: all dynamic static clean install


-----------------------------------------
Got the following error when compiling:
-----------------------------------------

g++ -c StrTok.cpp -Wall -O2 -I.
StrTok.cpp:23: default argument given for parameter 2 of `
   StrTok::StrTok(std::basic_string<char, std::char_traits<char>,
   std::allocator<char> >, std::basic_string<char, std::char_traits<char>,
   std::allocator<char> > = " ")'
StrTok.h:32: after previous specification in `
   StrTok::StrTok(std::basic_string<char, std::char_traits<char>,
   std::allocator<char> >, std::basic_string<char, std::char_traits<char>,
   std::allocator<char> > = " ")'
make: *** [StrTok.o] Error 1


Can you please help? Thanks in advance.

-- 
Truely, Madly, Deeply
Tony
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
http://www.comp.nus.edu.sg/~zhoujing

Computer science education cannot make anybody an expert programmer any more than studying brushes and pigment can make somebody an expert painter.