public: class QString & __ptr64 __cdecl QString::operator+=(enum QChar::SpecialCharacter) __ptr64

Mangled name

??YQString@@QEAAAEAV0@W4SpecialCharacter@QChar@@@Z

Exported by

size	filename	version
5842040	Qt5Core.dll	5.9.9.0
2760192	QtCore4.dll	4.7.2.0