Hot to get iterator to specific map key?

[Steve555]

I have a map with integer keys.

How do I loop through with an iterator so that I start with an iter
that corresponds to a key >= x?
(i.e. in the loop I only want to operate on elements with a key >= x)

myMapType::iterator iter, startIter = iter starting with x ???;
for(iter = startIter; iter != myMap.end(); ++iter)
{
....
}

Is this possible or do I just have to start from myMap.begin() and
check each key?
I can't use advance() as the keys aren't contiguous

Thanks
Steve

 

[Leandro Melo]

I have a map with integer keys.

How do I loop through with an iterator so that I start with an iter
that corresponds to a key >= x?
(i.e. in the loop I only want to operate on elements with a key >= x)

myMapType::iterator iter,   startIter = iter starting with x ???;
for(iter = startIter; iter != myMap.end(); ++iter)
{
...

}

Is this possible or do I just have to start from myMap.begin() and
check each key?
I can't use advance() as the keys aren't contiguous

The following would give you an iterator to the first element whose
key is not less than x. If no such element exists you'll get a past-
the-end iterator.

myMapType::iterator iter = myMap.lower_bound(x);

 

[Steve555]

The following would give you an iterator to the first element whose
key is not less than x. If no such element exists you'll get a past-
the-end iterator.

myMapType::iterator iter = myMap.lower_bound(x);

Thanks for the reply. Of course, classic case of not seeing the wood
for the trees.

Steve