The fromUcs2() named ctor is designed to replace all the non-char integral-type constructors of QChar which make it very hard to control the implicit QChar conversions, which have caused a few bugs in Qt itself. As a classical named contructor, it simply returns QChar. The fromUcs4() named "ctor", however, needs to expand surrogate pairs, and thus can't just return QChar. Instead, it returns a small struct that contains one or two char16_t's, can be iterated over and be implicitly converted to QStringView. To avoid bikeshedding the name (FromUcs4Result, of course :), it's defined inline and thus can't be named outside the function. This function replaces most uses of QChar::requiresSurrogates() in QtBase. [ChangeLog][QtCore][QChar] Added fromUcs2(), fromUcs4(). Change-Id: I803708c14001040f75cb599e33c24a3fb8d2579c Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>