QMap<QString, QVariant> map;

(gdb) p dataMap.value()
Too few arguments in function call.
(gdb) p dataMap.value("first")
Cannot resolve method QMap<QString, QVariant>::value to any overloaded instance
(gdb) p dataMap.value("first", QVariant(""))
A syntax error in expression, near `(""))'.

(gdb) p dataMap.value(QString("first"))

QString& toQString(const char* s)
{
       return *(new QString(s));
}

gdb> p dataMap.value(toQString("domain"));