accumulate() usage

[Allerdyce.John]

Hi,

I have a function with add elements of a STL list from 'start' to
'end'.
In the debugger, the size of the list is 2 and start is 0 and end is 1.
But it never goes itside 'do_add' and it just return 0. I expect it
just 'sum' the FIRST element (since start is 0 and end is 1).

Can you please tell me why is that?

_myList is a type of vector<int>
float getTotal(int start,int end) {
vector<int>::iterator beginItr = _myList.begin() + start;
vector<int>::iterator endItr = _myList.begin() + end;


return accumulate (beginItr, endItr, 0.0, do_add<int, float>());

}

 

[Neelesh Bodas]

But it never goes itside 'do_add' and it just return 0. I expect it
just 'sum' the FIRST element (since start is 0 and end is 1).

Can you please tell me why is that?

_myList is a type of vector<int>
float getTotal(int start,int end) {
vector<int>::iterator beginItr = _myList.begin() + start;
vector<int>::iterator endItr = _myList.begin() + end;
return accumulate (beginItr, endItr, 0.0, do_add<int, float>());

This code works fine when I tried it (After adding necessary minimal
definitions and other stuff). Could you please give the complete code
which demonstrates the problem?