How to sort QList<QVariant> in Qt?

Question

I have the following datastructure.

QList<QVariant> fieldsList

How can I sort this list? This list contains strings. I want to sort the fieldList alphabetically?

Answer 1

I would do sorting in the following way:

 // Compare two variants.
 bool variantLessThan(const QVariant &v1, const QVariant &v2)
 {
     return v1.toString() < v2.toString();
 }

 int doComparison()
 {
     [..]
     QList<QVariant> fieldsList;

     // Add items to fieldsList.

     qSort(fieldsList.begin(), fieldsList.end(), variantLessThan);
 }

Answer 2

In Qt5, it seems qSort is deprecated. It's recommended to use:

#include <algorithm>
QList<QVariant> fieldsList;
std::sort(fieldsList.begin(), fieldsList.end());

Reference: site

Answer 3

For QList sorting your can use qSort

If you like to use QVariant for sorting or similar it has some stumblestones. Depending what you like to do you may write your own operator overlays.

BUT it bears quite a bit of danger! Because you might have to compare non-compatible values

Answer 4

int n;
int i;
for (n=0; n < fieldsList.count(); n++)
{
    for (i=n+1; i < fieldsList.count(); i++)
    {
        QString valorN=fieldsList.at(n).field();
        QString valorI=fieldsList.at(i).field();
        if (valorN.toUpper() > valorI.toUpper())
        {
            fieldsList.move(i, n);
            n=0;
        }
    }
}