[Qt-interest] Passing QList<QStringList> as arguments

[Jason H]

Couldn't that also be done as:
QList<QList<QString> > listOfLists;

With the intentional space in  "> >".





________________________________
From: Eric Clark <eclark at ara.com>
To: "Qt Interest (qt-interest at trolltech.com)" <qt-interest at trolltech.com>
Sent: Tue, August 24, 2010 4:05:36 PM
Subject: Re: [Qt-interest] Passing QList<QStringList> as arguments


Anytime David! Glad you got it working. Like Ellen and Alex said, when dealing 
with templates it is usually best to just include the headers instead of trying 
to get the syntax for the class prototype correct because it can be rather 
difficult to figure out at times and the compiler is not too great about 
helping. Good luck in your application development!
 
Thanks,
Eric
 
From:qt-interest-bounces at trolltech.com 
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of David Villalobos 
Cambronero
Sent: Tuesday, August 24, 2010 2:59 PM
To: Malyushytsky, Alex
Cc: qt-interest at trolltech.com
Subject: Re: [Qt-interest] Passing QList<QStringList> as arguments
 
Thanks to all the people that help me with your comments. I implements the 
Hellen & Alex solution and it seems to work at the moment.

#ifndef MYSQLTOPCLASS_H
#define MYSQLTOPCLASS_H

#include <QList>
#include <QStringList>

class QSqlQuery;
class QVariant;
class QString;
//class QStringList;
//class QList<class QStringList>;

class mysqlTopClass
{
public:
    mysqlTopClass();

    //Global variables
    QSqlQuery *query;

    //Global methods
    QVariant runQuery(QString queryToExecute);
    QVariant runQuery(QString queryToExecute, int column);
    QString fixedWidth(QString text, int width);
    QString outputAsTable(const QStringList *headers, const QList<QStringList> 
*rows);
};

#endif // MYSQLTOPCLASS_H

Again thanks a lot. 


Regards
---
David


On Tue, Aug 24, 2010 at 13:47, Malyushytsky, Alex <alex at wai.com> wrote:
As somebody mentioned  place where you put your includes is important.
 
>> ror: variable ‘QList<QStringList> rows’ has initializer but incomplete type
 
An error below might be related to usage forward declaration
(for example no includes yet, but compiler already need to know about type to 
proceed) 

 
The easiest way to check it place all includes in the header file where you 
declare the function.
Alex
 
 
 
 
From:qt-interest-bounces at trolltech.com 
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of David Villalobos 
Cambronero
Sent: Tuesday, August 24, 2010 10:38 AM

To: Andre Somers
Cc: qt-interest at trolltech.com
Subject: Re: [Qt-interest] Passing QList<QStringList> as arguments
 
Those are my headers:


#include <QtGui>
#include <QList>
#include <QString>
#include <QStringList>

and still got he error.


Regards
---
David
On Tue, Aug 24, 2010 at 11:31, Andre Somers <andre at familiesomers.nl> wrote:
 Op 24-8-2010 19:24, David Villalobos Cambronero schreef:
> Hi all, hope you can help me.
>
> Here is the scenario:
>
> I need to pass a function a QList<QStringList> param. I take a look at
> the nestedlayouts example, basically it has the following lines:
>
> QList<QStringList> rows = QList<QStringList>()
> << (QStringList() << "Verne Nilsen" << "123")
> << (QStringList() << "Carlos Tang" << "77")
> << (QStringList() << "Bronwyn Hawcroft" << "119")
> << (QStringList() << "Alessandro Hanssen" << "32")
> << (QStringList() << "Andrew John Bakken" << "54")
> << (QStringList() << "Vanessa Weatherley" << "85")
> << (QStringList() << "Rebecca Dickens" << "17")
> << (QStringList() << "David Bradley" << "42")
> << (QStringList() << "Knut Walters" << "25")
> << (QStringList() << "Andrea Jones" << "34");
>
> I can run the example without any problem. But if I copy and paste
> these two lines in my proyect:.
> QList<QStringList> rows = QList<QStringList>()
> << (QStringList() << "Verne Nilsen" << "123");
>
> I got he followin error:
> error: variable ‘QList<QStringList> rows’ has initializer but
> incomplete type
> error: invalid use of incomplete type ‘class QList<QStringList>’
>
> The example and my project both uses QtGui.
Sounds like you did not copy over the needed #include's as well. Your
compiler has currently no idea what a QList<QStringList> is supposed to
be. You need to point it to the place where it can find that.

André

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