Vector Iterator not dereferencable

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Hi all,

I started using vectors just recently, to store large number of data. The data consits of more than a 1000 rows with about 10 values in each row.

To retrieve the first and last value, I used the begin and end attribute of vector:-

C++

double startTime, endTime; 
vector<MyClass> DataTable; // The MyClass has variables that holds the variables from the data.

In order to retrieve the first and last values of one of the variable : time, I used :

C++

startTime =  DataTable.begin()->time; 
endTime    = DataTable.end()->time;

The startTime works fine, but when it reaches the endTime value, I get an error that says : "Vector Iterator not dereferencable ". Can't figure out why.. Any suggestions ?

Posted 24-Aug-12 1:29am

Sumal.V

Updated 12-Mar-18 3:43am

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CPallini · Accepted Answer · 2012-08-24T02:03:00

Solution 1

vector::end method returns an iterator referring to the past-the-end element (i.e. a guard, see here[^] ). you might use vector::back[^] , instead.

Posted 24-Aug-12 2:03am

CPallini

Updated 24-Aug-12 2:04am

v2

Comments

Sumal.V 24-Aug-12 8:56am

Yeah that works :)Cheers :)

The only change being the reference type. Here "." is used instead of "->" operator.

Wendelius 24-Aug-12 17:29pm

Nice!