dev-cpp-users

[Dev-C++] wstring in 4.9.7.0

[Michal M. <mol...@se...>]

   Hello,
does anybody know how to compile programs which are using std::wstring with
Dev-C++ 4.9.7.0 ? It looks like the standard C++ library is compiled
without such support.

Thanks in advance,
  Michal Molhanec

Re: [Dev-C++] wstring in 4.9.7.0

[Dave W. <orb...@ne...>]

what is std::wstring? i know what std::string is but not wstring ... none of
my books seem to know either ...?

/**
*    this compiles and runs using 4.9.7.0
*    and the gcc 2.95 compiler
*    (devcpp4970-gcc295.exe)
*    NOT the v3.2 compiler
*    (devcpp4970-gcc32.exe)
*/
#include <string>
#include <iostream.h>

void main (void) {
    std::string fish;
    fish = "fish";
    cout << fish << endl;
}


----- Original Message -----
From: "Michal Molhanec" <mol...@se...>
To: <dev...@li...>
Sent: Thursday, December 12, 2002 6:36 AM
Subject: [Dev-C++] wstring in 4.9.7.0


>
>    Hello,
> does anybody know how to compile programs which are using std::wstring
with
> Dev-C++ 4.9.7.0 ? It looks like the standard C++ library is compiled
> without such support.
>
> Thanks in advance,
>   Michal Molhanec

Re: [Dev-C++] wstring in 4.9.7.0

[Michal M. <mol...@se...>]

On Thu, 12 Dec 2002 11:55:27 +1100 Dave Walters <orb...@ne...> wrote:

> what is std::wstring? i know what std::string is but not wstring ...
> none of
> my books seem to know either ...?

string is typedef for basic_string<char> i.e. 8 bit wide character string
wstring is typedef for basic_string<wchar_t> i.e. 16 bit (unicode) wide
character string

Re: [Dev-C++] wstring in 4.9.7.0

[Dave W. <orb...@ne...>]

right... i found the typedef in
    $devcpp/include/g++-3/string :

// Main header for the -*- C++ -*- string classes.

#ifndef __STRING__
#define __STRING__

#include <std/bastring.h>

extern "C++" {
typedef basic_string <char> string;
// typedef basic_string <wchar_t> wstring;
} // extern "C++"

#endif


btw_____this matches exactly the file on my linux box (rh
7.1)_________/usr/include/g++-3/string :)


why is it commented out?

especially when there is an entry in the stdlib.ChangeLog stating that it
has been UNcommented ...

so i uncommented it, and i tried this :

#include <string>
#include <iostream.h>

void main (void) {
    std::wstring fish;
    fish = (wchar_t)"fish"; //i shouldn't have to typecast this should i
    cout << fish << endl;
}


and the output is "0", which makes me think i'm missing something with how
wstrings are handled in the gnu std:: templates ...?

so this is why its commented out: because there are no operators /
translators yet for wchar_t types (of course constructing a translator is
daunting for me ...)

what do you think mike? anyone?
i think the fix to this problem would make it into the next gcc release?

> On Thu, 12 Dec 2002 11:55:27 +1100 Dave Walters
<orb...@ne...> wrote:
>
> > what is std::wstring? i know what std::string is but not wstring ...
> > none of
> > my books seem to know either ...?
>
> string is typedef for basic_string<char> i.e. 8 bit wide character string
> wstring is typedef for basic_string<wchar_t> i.e. 16 bit (unicode) wide
> character string
>
>
>
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Re: [Dev-C++] wstring in 4.9.7.0

[Michal M. <mol...@se...>]

On Thu, 12 Dec 2002 12:34:54 +1100 Dave Walters
<orb...@ne...> wrote:

> right... i found the typedef in
>     $devcpp/include/g++-3/string :
> 
> // Main header for the -*- C++ -*- string classes.
> 
> #ifndef __STRING__
> #define __STRING__
> 
> #include <std/bastring.h>
> 
> extern "C++" {
> typedef basic_string <char> string;
> // typedef basic_string <wchar_t> wstring;
> } // extern "C++"
> 
> #endif
> 
> 
> btw_____this matches exactly the file on my linux box (rh
> 7.1)_________/usr/include/g++-3/string :)
> 
> 
> why is it commented out?
> 
> especially when there is an entry in the stdlib.ChangeLog stating that it
> has been UNcommented ...

in my dev-c++ 4.9.7.0 + gcc 3.2 it's already uncommented but somebody
forget
to recompile the library with it :-(
 
> so i uncommented it, and i tried this :
> 
> #include <string>
> #include <iostream.h>
> 
> void main (void) {
>     std::wstring fish;
>     fish = (wchar_t)"fish"; //i shouldn't have to typecast this should i
>     cout << fish << endl;
> }
> 
> 
> and the output is "0", which makes me think i'm missing something with
> how
> wstrings are handled in the gnu std:: templates ...?

you probably wanted to write:
fish = (wchar_t * ) "fish";
weren't you?
but it still want be correct as the correct syntax is
fish = L"fish";
and it should be written to wcout instead of cout

p.s.
it's better to
#include <iostream>
using namespace std;
instead of
#include <iostream.h>
and btw C++ standard knows only main returning int (not void)

Thanks in advance,
  Michal

Re: [Dev-C++] wstring in 4.9.7.0

[Michal M. <mol...@se...>]

maybe this should be changed: 

// Define if code specialized for wchar_t should be used.
/* #undef _GLIBCPP_USE_WCHAR_T */

?