[Boost-users] Iterator Range, sub range of a desired size

Subject: [Boost-users] Iterator Range, sub range of a desired size
From: David Kimmel (davidwkimmel_at_[hidden])
Date: 2012-10-29 00:40:29

Is there a function in BOOST, given a starting point and a desired size, that
returns iterators for a (sub) range?

For example, given:
a boost::circular_buffer which contains: 1 2 3 4 5 6 7 8 9 10
a starting point which is an iterator pointing to 5
and finally a desired size which is an int s = 4

The result of which would be iterators producing: 5 6 7 8

A possible implementation might be this (but I was hoping there was a BOOST
version since I can't find an STD algorithm)

template <typename Itr>
std::pair<Itr, Itr> getWindowDown(Itr begin, Itr end, Itr start, const int
windowSize)
{
        // Down first, then up if need be
        const Itr bottom = (end - start > windowSize) ? (start + windowSize) :
(end);
        const Itr top = (bottom - begin > windowSize) ? (bottom - windowSize) :
(begin);
        return make_pair(top, bottom);
}

Thanks,

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