Method nonzero

cpp/nd/array.hpp:857–883

    }

    inline void nonzero(icm::bit_vector_view output) const
    {
        if (has_data_) {
            nd::switch_numeric_dtype(dtype(), [this, &output]<typename T>() {
                auto y = data<T>();
                output.set_from_span(y);
            });
            return;
        }
        try {
            holder()->nonzero(output);
        } catch (const invalid_operation&) {
            int64_t i = 0L;
            auto e = end();
            for (auto it = begin(); it != e; ++it) {
                try {
                    auto d = *it;
                    if (d && !d.empty() && d.value<bool>(0)) {
                        output.set(i);
                    }
                } catch (const std::exception&) {
                    /// Intentionally empty.
                }
                ++i;
            }
        }
    }

    friend array eval(array);
    friend void copy_data(const array& arr, std::span<uint8_t>);