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#ifdef UNICODE
    typedef std::wstring _tstring;
#else
    typedef std::string _tstring;
#endif
 
class MbRange
{
public:
    MbRange() {}
    MbRange(const _tstring& str) {...}
 
    // I/O stream friend functions
    friend ostream& operator<<(ostream& o, const MbRange& r)
        { return o << r.first << '-' << r.last; }
 
    // data members
    _tstring first, last;
};
 
//gives error message:
//warning C4717: 'operator<<' : recursive on all control paths, function will cause runtime stack overflow

prog.cpp:4:13: error: 'string' in namespace 'std' does not name a type
prog.cpp:11:19: error: '_tstring' does not name a type
prog.cpp:11:29: error: ISO C++ forbids declaration of 'str' with no type
prog.cpp:14:12: error: 'ostream' does not name a type
prog.cpp:18:5: error: '_tstring' does not name a type
prog.cpp: In constructor 'MbRange::MbRange(const int&)':
prog.cpp:11:35: error: expected primary-expression before '...' token
prog.cpp:11:35: error: expected ';' before '...' token

Standard output is empty