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#ifdef _UNICODE
// concatenate a single character
const CString& operator+=(TCHAR ch);
#else
// concatenate an ANSI character after converting it to TCHARconst CString& operator+=(char ch);
const CString& operator+=(char ch);
#endif
#ifndef _UNICODE
// concatenate a single character
const CString& operator+=(TCHAR ch);
#else
// concatenate an ANSI character after converting it to TCHAR const CString& operator+=(char ch);
const CString& operator+=(char ch);
#endif