C++ Academy · Lesson

Range-Based for Loop with Containers

Iterate cleanly over containers with the C++11 range-based for syntax.

The Modern Loop

C++11 introduced the range-based for loop — iterate any container without explicit indices or iterators. Cleaner and harder to get wrong.

std::vector<int> v = {1, 2, 3, 4, 5};
for (int x : v) {
    std::cout << x << " ";
}

The example above copies each element into x. Fine for cheap types like int; expensive for large objects.