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staj_cursor.md

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jsoncons::staj_cursor

#include <jsoncons/staj_cursor.hpp>

typedef basic_staj_cursor<char> staj_cursor

The staj_cursor interface supports forward, read-only, access to JSON and JSON-like data formats.

The staj_cursor is designed to iterate over stream events until done() returns true. The next() function causes the reader to advance to the next stream event. The current() function returns the current stream event. The data can be accessed using the staj_event interface. When next() is called, copies of data previously accessed may be invalidated.

Destructor

virtual ~basic_staj_cursor() noexcept = default;

Member functions

virtual bool done() const = 0;

Check if there are no more events.

virtual const staj_event& current() const = 0;

Returns the current staj_event.

virtual void read_to(json_visitor& visitor) = 0;

Sends the parse events from the current event to the matching completion event to the supplied visitor E.g., if the current event is begin_object, sends the begin_object event and all inbetween events until the matching end_object event. If a parsing error is encountered, throws a ser_error.

virtual void read_to(json_visitor& visitor,
                    std::error_code& ec) = 0;

Sends the parse events from the current event to the matching completion event to the supplied visitor E.g., if the current event is begin_object, sends the begin_object event and all inbetween events until the matching end_object event. If a parsing error is encountered, sets ec.

virtual void next() = 0;

Get the next event. If a parsing error is encountered, throws a ser_error.

virtual void next(std::error_code& ec) = 0;

Get the next event. If a parsing error is encountered, sets ec.

virtual const ser_context& context() const = 0;

Returns the current context

Non-member functions

template <typename T,typename CharT,typename Json=std::conditional<is_basic_json<T>::value,T,basic_json<CharT>>::type>
staj_array_view<Json,T> staj_array(basic_staj_cursor<CharT>& cursor);

Create a view of the parse events as an array of items of type T. The current event type must be staj_event_type::begin_array.

template <typename Key,typename T,typename CharT,typename Json=std::conditional<is_basic_json<T>::value,T,basic_json<CharT>>::type>
staj_object_view<Key, T, Json> staj_object(basic_staj_cursor<CharT>& cursor);

Create a view of the parse events as an object of key-value pairs. The current event type must be staj_event_type::begin_object.