[Qt-interest] QVariant and user defined types

[Justus Best]

Hi,

> You have to register the metatype with a call to qRegisterMetaType first. You
> shouldn't assign your own numbers. Most applications have user-defined
> metatypes registered, so there's a huge risk of clashing if you do it the way
> you wrote above.
>    
Ok as the types are determined at runtime as I learnd from Dan Misburn 
there will be no way for me to use a switch.
Maybe the cascading ifs I use at the moment are not that much harder to 
read.

Thanks for your fast reply Justus

Am 01.06.2010 16:27, schrieb Dan Milburn:
> Justus Best wrote:
>    
>> Hi,
>>
>> I currenty stuck a little while trying to add some of my classes to
>> QVariant.
>> My problem is that I can't find a way to put my Types in an enum and use
>> them in a switch case with QVariant::userType().
>> I tried with an enum like :
>> enum MyTypes { Type1 = QVariant::UserType, Type2, Type3,  Type4, Type5 };
>> But this doesn't correspond with the TypeIds I get if I call
>> QVariant::userType().
>>
>> So is there any possibility to use QVariant with user definded types in
>> a switch statment ?
>>      
> In short, no.  The user type ids are not available at compile time so
> you can't use them in a switch statement.  You would need to map from
> the qMetaTypeId of the registered type to the values in your enum in
> some way.
>
> Dan
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