Slot default parameter generates error

michelson

When i set first slot default parameter i get an error:

//OK
void on_setId( QByteArray id );
void on_setId( QString id = QString("something"));

//ERROR
void on_setId( QByteArray id = QByteArray::fromStdString("something"); //<--
void on_setId( QString id = QString("something"));

Error:

\moc_rej006.cpp:314: error: call of overloaded 'on_setId()' is ambiguous
         case 34: _t->on_setId(); break;
                               ^

Moc is creating some weird cases for (non existing) functions:

case 34: _t->on_setId(); break;
case 35: _t->on_setId((*reinterpret_cast< QString(*)>(_a[1]))); break;
case 36: _t->on_setId(); break;

I dont have on_setId() which takes no parameters...
Whats wrong with this one? I mean why setting default parameter generates this error?

jsulm

This is invalid C++.
If you now call on_setId() how should compiler know which of on_setId() it should call?
The compiler error says the same: \moc_rej006.cpp:314: error: call of overloaded 'on_setId()' is ambiguous

michelson

Allright I understand, thanks!

SGaist

Hi,

On a side note, there's no need to use fromStdString to initialize a QByteArray with a string.