QList with multiple types

David_Gil

Hi!

I'd like to know whether it's possible to have a QList with multiple types, like
@
QList <QString, QString, bool>
@

When I try to compile it, I get this message:
error: wrong number of template arguments (3, should be 1)
error: provided for 'template<class T> class QList'

I understand why it says so, but I don't know what to do to get what I want. Can someone give me some help?

Thank you very much!

AcerExtensa

you should use QList "<QVariant>":http://doc-snapshot.qt-project.org/4.8/qvariant.html
with QVariant you can register own data-types...
if you need QString, QString, bool in the row(one QList element), this would look like that:

@
struct MyStruct
{
QString str1;
QString str2;
bool state;
};

Q_DECLARE_METATYPE(MyStruct)

QList<QVariant> list;
MyStruct tmp;
tmp.str1 = "test1";
tmp.str2 = "test2";
tmp.state = true;

list.append(QVariant(tmp));

...

MyStruct tmp2 = list.at(0).value<MyStruct>();
@

task_struct

Hello,

you can create a struct

@
struct yourNewType {
QString ...;
QString ...;
bool ...;
};
@

and than use this type in QList

@
QList<yourNewType>
@

Sam

Hi,
You can have a look on "QPair":http://qt-project.org/doc/qt-4.8/QPair.html and use
QList< QPair<QString,QString,bool> >.

Check this if it fulfills your requirement.

DerManu

[quote author="Soumitra" date="1336656040"]Hi,
You can have a look on "QPair":http://qt-project.org/doc/qt-4.8/QPair.html and use
QList< QPair<QString,QString,bool> >[/quote] As the name suggests, a QPair can't contain a triplet. You'd have to use absurd constructs like QList<QPair<QString,QPair<QString,bool> > > to make that work, but I won't encourage that. I'd go for a struct or class.

Sam

@DerManu,
Thanks for the clarification, I didn't tried with QPair yet. Your answer improved my knowledge base as well.

Thanks a lot :)