How do I call << operator of base class in the derived class

Question

I have this CSVParser class, I inherited it, and I need to call << operator in my derived class:

#include "dbcsv.h"

DbCsv::DbCsv() : CSVParser()
{
}


void addColumn(QString &source, const QString &val, const unsigned int s) // 0:duplicate, 1:unique
{
     CSVParser::<< source.toStdString();
}

void removeColumn(QString &source, const QString &val)
{

}

I get this error:

dbcsv.cpp: In function 'void addColumn(QString&, const QString&, unsigned int)':
dbcsv.cpp:10: error: expected unqualified-id before '<<' token
dbcsv.cpp: At global scope:

Answer 1

Precede << with operator and append parentheses. to make operator<<(whatever) .

This works for the other bit shift operator, and other operator overloads.

Answer 2

CSVParser::operator<<(source.toStdString());

The parentheses are mandatory, this is a function call.

Of course, if you haven't overridden operator<< , then it's simpler:

*this << source.toStdString(); // probably what you want