Class query_string

include/crow/query_string.h:305–510

A class to represent any data coming after the `?` in the request URL into key-value pairs.

    struct request;
    /// A class to represent any data coming after the `?` in the request URL into key-value pairs.
    class query_string
    {
    public:
        static const int MAX_KEY_VALUE_PAIRS_COUNT = 256;

        query_string() = default;

        query_string(const query_string& qs):
          url_(qs.url_)
        {
            for (auto p : qs.key_value_pairs_)
            {
                key_value_pairs_.push_back((char*)(p - qs.url_.c_str() + url_.c_str()));
            }
        }

        query_string& operator=(const query_string& qs)
        {
            url_ = qs.url_;
            key_value_pairs_.clear();
            for (auto p : qs.key_value_pairs_)
            {
                key_value_pairs_.push_back((char*)(p - qs.url_.c_str() + url_.c_str()));
            }
            return *this;
        }

        query_string& operator=(query_string&& qs) noexcept
        {
            key_value_pairs_ = std::move(qs.key_value_pairs_);
            char* old_data = (char*)qs.url_.c_str();
            url_ = std::move(qs.url_);
            for (auto& p : key_value_pairs_)
            {
                p += (char*)url_.c_str() - old_data;
            }
            return *this;
        }


        query_string(std::string params, bool url = true):
          url_(std::move(params))
        {
            if (url_.empty())
                return;

            key_value_pairs_.resize(MAX_KEY_VALUE_PAIRS_COUNT);
            size_t count = qs_parse(&url_[0], &key_value_pairs_[0], MAX_KEY_VALUE_PAIRS_COUNT, url);

            key_value_pairs_.resize(count);
            key_value_pairs_.shrink_to_fit();
        }

        void clear()
        {
            key_value_pairs_.clear();
            url_.clear();
        }