[/
 / Distributed under the Boost Software License, Version 1.0. (See accompanying
 / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 /]

[section Extended Examples]

[section Parsing JSON]

This is a conforming JSON parser.  It passes all the required tests in the
[@https://github.com/nst/JSONTestSuite JSON Test Suite], and all but 5 of the
optional ones.  Notice that the actual parsing bits are only about 150 lines
of code.

[extended_json_example]

[endsect]

[section Parsing JSON With Callbacks]

This is just like the previous extended JSON parser example, except that it
drops all the code that defines a JSON value, array, object, etc.  It
communicates events within the parse, and the value associated with each
event.  For instance, when a string is parsed, a callback is called that
indicates this, along with the resulting `std::string`.

[extended_callback_parsing_json_example]

Note that here, I was keeping things simple to stay close to the previous
parser.  If you want to do callback parsing, you might want that because
you're limited in how much memory you can allocate, or because the JSON you're
parsing is really huge, and you only need to retain certain parts of it.

If this is the case, one possible change that might be appealing would be to
reduce the memory allocations.  The only memory allocation that the parser
does is the one we told it to do _emdash_ it allocates `std::strings`.  If we
instead used `boost::container::small_vector<char, 1024>`, it would only ever
allocate if it encountered a string larger than 1024 bytes.  We would also
want to change the callbacks to take `const &` parameters instead of using
pass-by-value.

[endsect]

[endsect]