how to find subelement without loop

[bnadem]

i hae normal json file structure like

{
"element" :{
"test":"test",
"subelement": {
      "subsubelemnt1":"githu",
        "subsubelemnt2":"githu",
         "subsubelemnt3":"githu",
          "subsubelemnt4":"githu",

}
}
}

want to find "subelement2" or"subelement""subelement2" without looping, is there function like find , exist, contain without iterating?

• What is the issue you have?

• Please describe the steps to reproduce the issue. Can you provide a small but working code example?

• What is the expected behavior?

• And what is the actual behavior instead?

• Which compiler and operating system are you using? Is it a supported compiler?

• Did you use a released version of the library or the version from the develop branch?

• If you experience a compilation error: can you compile and run the unit tests?

[nickaein]

You can use JSON Pointers to access an element if you can provide its full address in the hierarchy of JSON document e.g. json_doc["/element/subelement/subsubelemnt2"].

I'm not sure whether there is a method to look up for subsubelemnt2 in all subtrees.

[bnadem]

no dont working, i become null pointer.

[nlohmann]

Assuming your JSON value is j, then you can access the value with j["element"]["subelement"]["subsubelemnt1"];.

[garethsb]

You can use JSON Pointers to access an element if you can provide its full address in the hierarchy of JSON document e.g. json_doc["/element/subelement/subsubelemnt2"].

json_doc["/element/subelement/subsubelemnt2"_json_pointer]

[nickaein]

@garethsb-sony: Whoops. Thanks for clarification!

[garethsb]

@nickaein I just didn't want anyone to think the json_pointer solution didn't work. :-)