CODEWITHSUNDEEP
qtqlist
Euler
Euler

Reputation: 59

how to comapre two QList variables in Qt

I want to compare two Qlist say

QList<QSerialPortInfo> port1;
QList<QSerialPortInfo> port2;

I want to implement it in if condition such that 

if (port1 != port2)
{
// do something
}

but it seems that it doesn't work like that I have read the documentation for QList and there is this member 

operator!=(const QList<T> &other) const

Any Idea how to implement it, please don't go and say ohh I am not going to give you the solution but here is a tip. I am not a student and this is not a homework. I am doing my own project in Qt. thanks guys.

Upvotes: 2

Views: 1336

Answers (1)

G.M.
G.M.

Reputation: 12899

From the QList<T>::operator!= documentation...

This function requires the value type to have an implementation of operator==().

Unfortunately there is no valid operator== defined for QSerialPortInfo but you can easily implement your own...

bool operator== (const QSerialPortInfo &lhs, const QSerialPortInfo &rhs)
{
  return lhs.manufacturer() == rhs.manufacturer()
    && lhs.serialNumber() == rhs.serialNumber();
}

The code shown assumes that a QSerialPortInfo instance can be uniquely identified by its manufacturer and serial number.

Upvotes: 5

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