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Unicode and configuration files

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I''m writing an app that could handle and store international data. Right now I don''t know of any chat networks that allow Unicode usernames, but it is conceivable that it could happen very soon. Therefore I need my engine to deal in Unicode data. 1. Should I use wchar_t, or ints? Apparently 16 bits isn''t enough to store all the characters in the world. 2. What kind of format would be best for storing this data? I''m cautious about XML, it seems pretty unnecessary in this case. I''d like the files to be simply "name=value", kind of like INI files, but I''m unsure whether the INI files would support Unicode. I''ll be writing everything out as Unicode, and loading everything back in. The individual pieces that need to will convert to/from other formats (mostly the networking side). I''d have used the standard library to do this, except w[i|o]fstream doesn''t work as expected with wchar_t because VC7.1 doesn''t include a codecvt to handle it.

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