Function memcpy

dlib/cuda/gpu_data.h:222–228

#else

    inline void memcpy (gpu_data& dest, const gpu_data& src)
    {
        DLIB_CASSERT(dest.size() == src.size());
        if (src.size() == 0 || &dest == &src)
            return;
        std::memcpy(dest.host_write_only(), src.host(), sizeof(float)*src.size());
    }

    inline void memcpy (
        gpu_data& dest,