Quick Q: How do I allow iteration on an internal vector without exposing the vector?—StackExchange

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Quick A: By exposing wrapped iterators in your interface.

From Programmers StackExchange, StackOverflow's sister site:

Allow iteration of an internal vector without leaking the implementation

I have a class that represents a list of people.

class AddressBook
{
public:
  AddressBook();

private:
  std::vector<People> people;
}
I want to allow clients to iterate over the vector of people. The first thought I had was simply:
std::vector<People> & getPeople { return people; }
However, I do not want to leak the implementation details to the client. I may want to maintain certain invariants when the vector is modified, and I lose control over these invariants when I leak the implementation.
What's the best way to allow iteration without leaking the internals?

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Gvidon said on Dec 9, 2014 02:41 AM:

What about a simple for_each member function?
Like:

struct S
{
template<typename Func>
void for_each(Func f)
{
for (const auto &i: m_vec)
f(i);
}

std::vector<int> m_vec;
};

Details may vary, of course