Method double_ptr

example/json.hpp:348–354

        }

        double const * double_ptr() const noexcept
        {
            double const * retval = reinterpret_cast<double const *>(
                storage_.local_.bytes_.data() + 7);
            assert(std::uintptr_t(retval) % alignof(double) == 0);
            return retval;
        }
        double * double_ptr() noexcept
        {
            double * retval =