Concise way to write a for/else in C++?

Question

In some code I was working on, I have a for loop that iterates through a map:

for (auto it = map.begin(); it != map.end(); ++it) {

    //do stuff here
}

And I wondered if there was some way to concisely write something to the effect of:

for (auto it = map.begin(); it != map.end(); ++it) {
    //do stuff here
} else {
    //Do something here since it was already equal to map.end()
}

I know I could rewrite as:

auto it = map.begin();
if (it != map.end(){

    while ( it != map.end() ){
        //do stuff here
        ++it;
    }

} else {
    //stuff
}

But is there a better way that doesn't involve wrapping in an if statement?

Answer 1

Obviously...

if (map.empty())
{
    // do stuff if map is empty
}
else for (auto it = map.begin(); it != map.end(); ++it)
{
    // do iteration on stuff if it is not
}

By the way, since we are talking C++11 here, you can use this syntax:

if (map.empty())
{
    // do stuff if map is empty
}
else for (auto it : map)
{
    // do iteration on stuff if it is not
}