Why many libraries define own string classes instead of using std::string and std::wstring?

Posted by Anton Kazennikov on Stack Overflow See other posts from Stack Overflow or by Anton Kazennikov
Published on 2010-04-06T17:01:49Z Indexed on 2010/04/06 17:03 UTC
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Why many libraries define their own string classes instead of using string classes from STL?

For example, xerces-c - it uses std::basic_string<>, but uses its own char type instead of wchar_t. Why?

Or MFC, for example?

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