Function contains

include/behaviortree_cpp/contrib/json.hpp:14383–14460

    */
    template<typename BasicJsonType>
    bool contains(const BasicJsonType* ptr) const
    {
        for (const auto& reference_token : reference_tokens)
        {
            switch (ptr->type())
            {
                case detail::value_t::object:
                {
                    if (!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 && !("0" <= reference_token && reference_token <= "9")))
                    {
                        // invalid char
                        return false;
                    }
                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() > 1))
                    {
                        if (JSON_HEDLEY_UNLIKELY(!('1' <= reference_token[0] && 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(!('0' <= reference_token[i] && reference_token[i] <= '9')))
                            {
                                // other char should be between '0' and '9'
                                return false;
                            }
                        }
                    }

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

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