A timely article, as there has been an extensive flurry of discussion within the committee over the past weekend about defaults for the ranged for:

Convenient Constructs For Stepping Through a Range of Values

by Mikhail Semenov

From the article:

In this article, the following loops are proposed:

for (auto x : step(start, count, step-width)) { ... }

for (auto x : step(count)) {...}

for (auto x : step_backward(count)) {...}

for (auto x : step_to(start, finish, step-width)) {...}

for (auto x : step_until(start, finish, step-width)) {...}

They are based on the C++11 for-range loop. In order to write such loops, the appropriate functions step, step_backward, step_to and step_until have to be implemented.  The article shows their implementation, discusses advantages of such loops and includes the benchmark results.