static tagged_pair impl()

in include/range/v3/algorithm/unique_copy.hpp [98:115]

• 18 lines of code
• 8 McCabe index (conditional complexity)

            static tagged_pair<tag::in(I), tag::out(O)> impl(I begin, S end, O out, C pred_, P proj_,
                concepts::InputIterator*, std::true_type)
            {
                auto &&pred = as_function(pred_);
                auto &&proj = as_function(proj_);
                if(begin != end)
                {
                    *out = *begin;
                    while(++begin != end)
                    {
                        auto &&x = *begin;
                        if(!pred(proj(*out), proj(x)))
                            *++out = (decltype(x) &&) x;
                    }
                    ++out;
                }
                return {begin, out};
            }