[Qt-interest] QMap container issue

[Scott Aron Bloom]

Check the value of "this", in your debugger...

 

Mostlikely its NULL or invalid


Scott

 

From: qt-interest-bounces+scott.bloom=onshorecs.com at qt.nokia.com
[mailto:qt-interest-bounces+scott.bloom=onshorecs.com at qt.nokia.com] On
Behalf Of Sajjad
Sent: Saturday, July 23, 2011 6:05 AM
To: qt-interest at trolltech.com
Subject: [Qt-interest] QMap container issue

 

Hello forum,

 

I am trying to implement a graph data-structure using QMap<QString,int>
and QVector<Node*> .

 

QMap<> contains the node name and index of the QVector so that i can
accesss the Node* directly. 

 

And i have the following function to retrieve the index for the vector
to retrieve the node

 

 

////////////////////////////////////////////////////////////////////////
//

 

 

int SceneHierarchy::getNodeIndex(const QString &nodeName) const
{
    int pos = -1;
    //find the node in the map with the key - node name
    QMap<QString,int>::const_iterator iter =
m_nodeMap.constFind(nodeName);
 
    if(iter == m_nodeMap.constEnd())
    {
        //node name is not found in the map
        pos = -1;
    }
    else
    {
        //!node found inside the map and so we
        //!return the index of the node in the vector list
        pos = iter.value();
    }
    return pos;
}

 

 

////////////////////////////////////////////////////////////////////////
////

 

 

The program crashes at the following line 

 

 
    QMap<QString,int>::const_iterator iter =
m_nodeMap.constFind(nodeName);
 
 
 
I do not get what could be the possible problem with the above code. If
the name is not found it will simply returns constEnd(), right?
 
 
I must be missing something. Anyone in the forum help to point it out?
 
 
 
 
Thanks 
Sajjad
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