[Qt-interest] Q_ENUM registering Problem

[Reece Dunn]

On 15 April 2010 09:13, Aaron Lewis <aaron.lewis1989 at gmail.com> wrote:
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> On 04/15/2010 03:53 PM, Denis Akhmetzyanov wrote:
>> Hi,
>> Is function QString fetchPic(MState state) in the mpainter class? Otherwise
>> you should use:
>
> fetchPic is part of mpainter class
>
> class mpainter : public QDialog {
>        Q_OBJECT
>        Q_ENUMS (MState)
>
>        enum MState{ready,wait,lost};
>
>        private:
>                QString fetchPic(MState state);
> }
>
> In construct function of mpainter:
>
> I tried to call fetchPic:
> ===========================================
>
> QString aa = fetchPic(MState::ready);
>
> ===========================================
>
> Then i got errors like `MState is not a namespace or class'.
>
> Do i use the wrong way to call this function or put the enum declaration
> in the wrong place ?
>
> Appreciate any help ;-)

Anything defined in a class needs to be qualified by that class name
(it acts like a namespace scope). Therefore, you need to access MState
as mpainter::MState.

Enumeration values in C++ do not have the enumeration name as a scope
qualifier. Therefore, you don't access ready through
mpainter::MState::ready, but mpainter::ready.

Thus, you have:
    QString aa = fetchPic(mpainter::ready);

Also, by default, anything declared in a class is private, so you may
get an error about not being able to access the enumeration or its
values. You therefore need something like this:

   public:
        enum MState{ready,wait,lost};

HTH,
- Reece