Printing lists with commas C++

Question

I know how to do this in other languages, but not C++, which I am forced to use here.

I have a Set of Strings that I\'m printing to out in a list, and they need a co

Answer 1

It's very easy to fix that (taken from my answer here):

bool print_delim = false;
for (auto iter = keywords.begin(); iter != keywords.end( ); iter++ ) {
    if(print_delim) {
        out << ", ";
    }
    out << *iter;
    print_delim = true;
}
out << endl;

---

I am using this idiom (pattern?) in many programming languages, and all kind of tasks where you need to construct delimited output from list like inputs. Let me give the abstract in pseudo code:

empty output
firstIteration = true
foreach item in list
    if firstIteration
        add delimiter to output
    add item to output
    firstIteration = false

In some cases one could even omit the firstIteration indicator variable completely:

empty output
foreach item in list
    if not is_empty(output)
        add delimiter to output
    add item to output