picojsonのネスト構造取得サンプル

try
{
  element_value =
    root_value.get< picojson::object >().at( "aaa" )
      .get< picojson::object >().at( "bbb" )
        .get< picojson::object >().at( "ccc" )
          .get< double >()
  ;
}
catch( ... )
{ ... }

ネタ元

• https://gist.github.com/usagi/ad5886604913753a42020b87c8d766ea
• https://ameblo.jp/systemtelescope/entry-11820880734.html