The QChar ctor overload set is a mess, as it allows implicit conversions from other types. E.g. char32_t is using one of the int/uint overloads. Ditto wchar_t on Unix. Disallow implicit conversions by making all¹ ctors templates and constraining them on just the types we want. ¹ except the (uchar, uchar) one This also removes the need to maintain the SFINAE-unfriendly =delete'd char/uchar ctors in QT_NO_CAST_FROM_ASCII builds. Needed to fix a few QChar(Qt::Key) users in Apple code. [ChangeLog][QtCore][Potentially Source-Incompatible Changes] QChar constructors no longer perform implicit conversions. They only accept the exact types listed in the documentation. A backwards-compatible fix is to explicitly cast to one of the explicitly-supported argument types. [ChangeLog][QtCore][QChar] The constructors no longer perform implicit conversions. They only accept the exact types listed in the documentation. A backwards-compatible fix is to cast to one of the explicitly-supported argument types. Change-Id: I5db96948b4724e96c6a0ede9a8ff5cae3bfa3280 Reviewed-by: Ahmad Samir <a.samirh78@gmail.com> Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>