Repository: nlohmann/json
File: include/nlohmann/detail/json_pointer.hpp (C++)

Code before:
                {
                    if (not ptr->contains(reference_token))
                    {
                        // we did not find the key in the object
                        return false;
                    }

                    ptr = &ptr->operator[](reference_token);
                    break;
                }

                case detail::value_t::array:
                {
                    if (JSON_HEDLEY_UNLIKELY(reference_token == "-"))
                    {
                        // "-" always fails the range check
                        return false;
                    }
                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() == 1 and not (reference_token >= "0" and reference_token <= "9")))
                    {
                        // invalid char
                        return false;
                    }
                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() > 1))
                    {
                        if (JSON_HEDLEY_UNLIKELY(not (reference_token[0] > '0' and reference_token[0] <= '9')))
                        {
                            // first char should be between '1' and '9'
                            return false;
                        }
                        for (std::size_t i = 1; i < reference_token.size(); i++)
                        {
                            if (JSON_HEDLEY_UNLIKELY(not (reference_token[i] >= '0' and reference_token[i] <= '9')))
                            {
                                // other char should be between '0' and '9'
                                return false;
                            }
                        }
                    }

                    const auto idx = static_cast<size_type>(array_index(reference_token));
                    if (idx >= ptr->size())
                    {
                        // index out of range
                        return false;
                    }

                    ptr = &ptr->operator[](idx);
                    break;
                }


Review comment (suggestion):
```suggestion
                        if (JSON_HEDLEY_UNLIKELY(not ('1' <= reference_token[0] and reference_token[0] <= '9')))
```

Code after:
                {
                    if (not ptr->contains(reference_token))
                    {
                        // we did not find the key in the object
                        return false;
                    }

                    ptr = &ptr->operator[](reference_token);
                    break;
                }

                case detail::value_t::array:
                {
                    if (JSON_HEDLEY_UNLIKELY(reference_token == "-"))
                    {
                        // "-" always fails the range check
                        return false;
                    }
                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() == 1 and not ("0" <= reference_token and reference_token <= "9")))
                    {
                        // invalid char
                        return false;
                    }
                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() > 1))
                    {
                        if (JSON_HEDLEY_UNLIKELY(not ('1' <= reference_token[0] and reference_token[0] <= '9')))
                        {
                            // first char should be between '1' and '9'
                            return false;
                        }
                        for (std::size_t i = 1; i < reference_token.size(); i++)
                        {
                            if (JSON_HEDLEY_UNLIKELY(not ('0' <= reference_token[i] and reference_token[i] <= '9')))
                            {
                                // other char should be between '0' and '9'
                                return false;
                            }
                        }
                    }

                    const auto idx = static_cast<size_type>(array_index(reference_token));
                    if (idx >= ptr->size())
                    {
                        // index out of range
                        return false;
                    }

                    ptr = &ptr->operator[](idx);
                    break;
                }