[ranges] typo in equal_impl causes O(N) impl to be selected instead of O(1) impl

[Eric Niebler]

The following overload of equal_impl will never be selected because it doesn't take the extra two tag parameters that the others do:

    template< class RandomAccessTraversalReadableIterator1,
                class RandomAccessTraversalReadableIterator2,
                class BinaryPredicate >
    inline bool equal_impl( RandomAccessTraversalReadableIterator1 first1,
                            RandomAccessTraversalReadableIterator1 last1,
                            RandomAccessTraversalReadableIterator2 first2,
                            RandomAccessTraversalReadableIterator2 last2,
                            BinaryPredicate                        pred )
    {
        return ((last1 - first1) == (last2 - first2))
            && std::equal(first1, last1, first2, pred);
    }

[Neil Groves]

Argh, what a school boy error - sorry.

[Eric Niebler]

Ha! These errors are hard to spot. The code compiles and yields the correct results, after all. Don't sweat it.