Re: Copying a CString to a std::string

From:
"Tom Serface" <tom@nospam.camaswood.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 7 Jan 2009 15:26:03 -0800
Message-ID:
<9EC3BB2F-1E2C-484F-A2BE-BC84C4FA9817@microsoft.com>
I like that. I do define both, but your suggestion strikes me as more
elegant. Thanks.

Tom

"Mihai N." <nmihai_year_2000@yahoo.com> wrote in message
news:Xns9B8BE254A48F6MihaiN@207.46.248.16...

namespace std {
#if defined _UNICODE || defined UNICODE
     typedef wstring tstring;
     typedef wstringstream tstringstream;
#else
     typedef string tstring;
     typedef stringstream tstringstream;
#endif
}


If you do this it does not mean that the CString
and std::string will use the same string types.

_UNICODE controls the CRT functions, UNICODE
controls the Win32 API (and MFC).

So if you have _UNICODE defined, but not UNICODE,
then tstring will be Unicode ans CString will be ANSI.

This is why one should *always* define both
(or it means they are asking for rouble :-)

A cleaner option (kind of equivalent to the one above) is:

namespace std {
   typedef basic_string<_TCHAR> tstring;
   typedef basic_stringstream<_TCHAR> tstringstream;
}

_TCHAR follows the _UNICODE definition.
If you want to be in sync with CString, then you should use TCHAR

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