[Qt-interest] QFlags and conditional assignment

[Ulf-Alexander v. Ceumern-Lindenstjerna]

Hi list,

while testing my own QFlags for the first time I found a strange compiler issue:

this is the class using the flags:

MyClass{
	enum ScoringOption {
		SCORING_DISABLED = 0x0,
		SCORING_FUNDUS = 0x1,
		...
	};
	Q_DECLARE_FLAGS(ScoringOptions, ScoringOption)

private:
	ScoringOptions m_scoringOptions;
}
Q_DECLARE_OPERATORS_FOR_FLAGS(MyClass::ScoringOptions)

This is what I do:

m_scoringOptions = 0; // works!
bool ok = true;
m_scoringOptions = ok ? SCORING_FUNDUS : SCORING_DISABLED; //works!
m_scoringOptions = ok ? SCORING_FUNDUS : 0; // error:

1>.\src\myclass.cpp(150) : error C2679: binary '=' : no operator found which takes a right-hand operand of type 'int' (or there is no acceptable conversion)
1>        d:\lib\qt\4.6.1\include\qtcore\../../src/corelib/global/qglobal.h(2172): could be 'QFlags<Enum> &QFlags<Enum>::operator =(const QFlags<Enum> &)'
1>        with
1>        [
1>            Enum= MyClass::ScoringOption
1>        ]
1>        while trying to match the argument list '(MyClass::ScoringOptions, int)'

Apparently the assignment operator behaves differently when a conditional assignment is used. Is this intended? Or am I doing something horribly wrong?

I am puzzled...
Regards, Ulf

--
Ulf v. Ceumern
Dipl.-Inf.

VRmagic GmbH
Augustaanlage 32
68165 Mannheim, Germany
E-Mail: ceumern at vrmagic.com

Tel.: +49/621/400416-52
Fax: +49/621/400416-99


Steuernummer: 38189/54003
USt.IdNr.: DE217365947
Registergericht: Amtsgericht Mannheim, HRB 8958
Geschäftsführer: Norbert Hinckers, Dr. Markus Schill
--