Function copy

extern/nfd/nfd_portal.cpp:84–89

template <typename T>
T* copy(const T* begin, const T* end, T* out) {
    for (; begin != end; ++begin) {
        *out++ = *begin;
    }
    return out;
}

template <typename T, typename Callback>
T* transform(const T* begin, const T* end, T* out, Callback callback) {