wstring in gcc

[Abhijit Gupta <abhijit dot gupta at wipro dot com>]

Hi ,
   Does gcc 3.1 support wstring ? If it does not then  how can I make  
my code to use wide character
strings?

I have found following things in the gcc  installation directory..
1) /usr/include/gcc/darwin/2.95.2/g++/string

Line No : 10
// typedef basic_string <wchar_t> wstring;

wstring is commented out for gcc 2.95

2) /usr/include/gcc/darwin/3.1/g++-v3/

iosfwd:124:  typedef basic_stringbuf<wchar_t>   wstringbuf;
iosfwd:127:  typedef basic_stringstream<wchar_t>        wstringstream;

bits/stringfwd.h:64     typedef basic_string<wchar_t> wstring;

I am using gcc 3.1 for compilation but still it is giving problem.

Any help will be highly appreciated.

Thanks & Regards,
Abhijit



Following is the sample code and program output....

/ 
************************************************************************ 
*******************/
include <string>
#include <iostream>
#include<iosfwd>

int  main( )
{
   using namespace std;
   // Equivalent ways to declare an object of type
   // basic_string <wchar_t>
   const basic_string <wchar_t> s1 ( L"abc" );
   wstring  s2( L"abc");   // Uses the typedef for wstring

   // Comparison between two objects of type basic_string <wchar_t>
   if ( s1 == s2 )
      cout << "The strings s1 & s2 are equal." << endl;
   else
      cout << "The strings s1 & s2 are not equal." << endl;
   return 0;
}
/ 
************************************************************************ 
*******************/


Compilation Error :

[Abhijit-Guptas-Computer:~] abhijitg% gcc testuni.cpp

ld: Undefined symbols:
std::basic_string<wchar_t, std::char_traits<wchar_t>,  
std::allocator<wchar_t> >::compare(std::basic_string<wchar_t,  
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&) const
std::allocator<wchar_t>::allocator[in-charge]()
std::allocator<wchar_t>::~allocator [in-charge]()
std::basic_string<wchar_t, std::char_traits<wchar_t>,  
std::allocator<wchar_t> >::basic_string[in-charge](wchar_t const*,  
std::allocator<wchar_t> const&)
std::basic_string<wchar_t, std::char_traits<wchar_t>,  
std::allocator<wchar_t> >::~basic_string [in-charge]()
std::basic_ostream<char, std::char_traits<char>  
>::operator<<(std::basic_ostream<char, std::char_traits<char> >&  
(*)(std::basic_ostream<char, std::char_traits<char> >&))
std::ios_base::Init::Init[in-charge]()
std::ios_base::Init::~Init [in-charge]()
std::cout
std::basic_ostream<char, std::char_traits<char> >& std::endl<char,  
std::char_traits<char> >(std::basic_ostream<char,  
std::char_traits<char> >&)
std::basic_ostream<char, std::char_traits<char> >& std::operator<<  
<std::char_traits<char> >(std::basic_ostream<char,  
std::char_traits<char> >&, char const*)
___gxx_personality_v0

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