How to define a custom iterator in C++
- by Robert Martin
I've seen a number of posts on SO about how to define custom iterators, but nothing that seems to exactly answers my question, which is...
How do I create an iterator that hides a nested for loop?
For instance, I have a class Foo, inside of the Foo is a Bar, and inside of the Bar is a string. I could write
for (const Foo& foo : foo_set)
for (const Bar& bar : foo.bar_set)
if (bar.my_string != "baz")
cout << bar.my_string << endl;
but instead I want to be able to do something like:
for (const string& good : foo_set)
cout << good << endl;
How do I do something like this?
