sorry for posting what i am afraid is a pure c++-problem here, but at least it is about a qt-program:
i have a loop going through a query and a QMap where i want to store the type and name of each column that is found. so i am trying to put the result of QSqlField::type() into my QMap, but this gives an error because it is const. Why is that? after all i had expected i am actually only copying the value into my QMap so no need to care about the original being const?
the code looks like this:
Qt Code: 
  1. while (query.next()) {
  2.         QSqlRecord rec = query.record();
  3.         for (int col=0;col<rec.count();col++) {
  4.             QSqlField field = rec.field(col);
  5.             if (row == 0) {
  6.                 QMap<QString,QVariant>* currCol = &columns.value(col);
  7.                 currCol->insert("type",field.type());  // first error
  8.                 currCol->insert("name",field.name()); // second error
  9.             }
  10.             qDebug() << "working on row " << row << ", column " << col;
  11.         }
  12.         tableData.value(row) = rec; //third error
  13.         row++;
  14.     }
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and in the .h i have:

Qt Code: 
  1. QMap<int,QSqlRecord> tableData;
  2. QMap<int,QMap<QString,QVariant> > columns;
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the errors i am getting are all like this:
passing `const QString' as `this' argument of `QString& QString::operator=(char)' discards qualifiers