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3rd/nlohmann_json/single_include/nlohmann/json.hpp:12474–12843

{
template<typename BasicJsonType>
class json_pointer
{
    // allow basic_json to access private members
    NLOHMANN_BASIC_JSON_TPL_DECLARATION
    friend class basic_json;

  public:
    /*!
    @brief create JSON pointer

    Create a JSON pointer according to the syntax described in
    [Section 3 of RFC6901](https://tools.ietf.org/html/rfc6901#section-3).

    @param[in] s  string representing the JSON pointer; if omitted, the empty
                  string is assumed which references the whole JSON value

    @throw parse_error.107 if the given JSON pointer @a s is nonempty and does
                           not begin with a slash (`/`); see example below

    @throw parse_error.108 if a tilde (`~`) in the given JSON pointer @a s is
    not followed by `0` (representing `~`) or `1` (representing `/`); see
    example below

    @liveexample{The example shows the construction several valid JSON pointers
    as well as the exceptional behavior.,json_pointer}

    @since version 2.0.0
    */
    explicit json_pointer(const std::string& s = "")
        : reference_tokens(split(s))
    {}

    /*!
    @brief return a string representation of the JSON pointer

    @invariant For each JSON pointer `ptr`, it holds:
    @code {.cpp}
    ptr == json_pointer(ptr.to_string());
    @endcode

    @return a string representation of the JSON pointer

    @liveexample{The example shows the result of `to_string`.,json_pointer__to_string}

    @since version 2.0.0
    */
    std::string to_string() const
    {
        return std::accumulate(reference_tokens.begin(), reference_tokens.end(),
                               std::string{},
                               [](const std::string & a, const std::string & b)
        {
            return a + "/" + detail::escape(b);
        });
    }

    /// @copydoc to_string()
    operator std::string() const