ion returns the actual number of characters
            parsed, which may be less than the size of the input. This allows parsing
            of a buffer containing multiple individual JSONs or containing different
            protocol data.
          </p>
<h7><a name="json.ref.boost__json__stream_parser.write_some.overload3.h2"></a>
            <span class="phrase"><a name="json.ref.boost__json__stream_parser.write_some.overload3.example"></a></span><a class="link" href="overload3.html#json.ref.boost__json