Re: I don't understand this error

[Matthieu Brucher]

Oliver Elphick wrote:
> Here is the code that is failing:
>
> 235   void VanConnect::upload_copy_started(const QList<QNetworkOperation> l)
> 236   {
> 237     QNetworkOperation* op = l.first();
>         ...
>       }
>
> and the error:
> vanconnect.cpp: In method `void
> VanConnect::upload_copy_started(QList<QNetworkOperation>)':
> vanconnect.cpp:237: passing `const QList<QNetworkOperation>' as `this'
> argument of `class QNetworkOperation *
> QList<QNetworkOperation>::first()' discards qualifiers
>
>
> The compiler is claiming the method takes an argument of type
> QList<QNetworkOperation> whereas the actual argument is
> const QList<QNetworkOperation>
>
>
> Compiler is g++ 2.95
> Qt 2.3.10

The list is a constant list, so getting a non-const pointer to the first 
element is not possible. You must pass a QList instead or not modify 
QList by declaring op to be const.

Matthieu

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