/usr/include/bobcat/binarysearch is in libbobcat-dev 3.19.01-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | #ifndef INCLUDED_BOBCAT_BINARYSEARCH_
#define INCLUDED_BOBCAT_BINARYSEARCH_
namespace FBB
{
template <typename Iterator, typename Type>
Iterator binary_search(Iterator begin, Iterator end, Type const &value)
{
    Iterator ret = end;
    while (begin != end)
    {
        Iterator mid = begin + (end - begin >> 1);
        if (value < *mid)       // left half
            end = mid;
        else if (*mid < value)  // right half
            begin = mid + 1;
        else
            return mid;
    }
    return ret;
}
template <typename Iterator, typename Type, typename Comparator>
Iterator binary_search(Iterator begin, Iterator end, Type const &value, 
                       Comparator comparator)
{
    Iterator ret = end;
    while (begin != end)
    {
        Iterator mid = begin + (end - begin >> 1);
        if (comparator(value, *mid))        // left half
            end = mid;
        else if (comparator(*mid, value))   // right half
            begin = mid + 1;
        else
            return mid;
    }
    return ret;
}
} // FBB
#endif
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