Question

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Is there a range class in C++11 for use with range based for loops?

I.e. is there a standard range with iterator that will dereference to an integer?
I’m thinking about something like this:

for (int i : rangeTo(10)) { ... }
for (int i : rangeFromTo(10, 20)) { .... }

Answer 1

No, but there is boost::irange:

#include <boost/range/irange.hpp>
...
for (auto i : boost::irange(10, 20))
{
    std::cout << i << ' ';
}

and boost::counting_range

for (auto i : boost::counting_range(10, 20))
{
    std::cout << i << ' ';
}

The difference is you can add a step, for boost::irange(10, 20, 2).