Object.keys()

[ghost]

I have this in JS:

let myObject = {"pages": {"32746": {"data": "A data"}}};
console.log(myObject.pages[myObject.keys(myObject.pages)])

I readed the API documentation but I don't found this.
I tried with: j["pages"]["*"] but don't work.
Any help?

[nlohmann]

There is currently no such call in the library. Internally, we use std::map for objects, and I don't know a function to retrieve a map's keys without explicitly iterating over the map and collecting the keys.

Maybe this could be a feature for the future.

[nlohmann]

I think this is out of scope for a C++ library. There is no "cheap" solution to retrieve a std::map's keys, and a keys() function would hence be an naive loop that copies the keys into a container. And mostly, you would then need to iterate that container again to do anything useful with the keys - and this iteration could also have been done on the object itself, like

for (json::iterator it = myObject["pages"].begin();
     it != myObject["pages"].end(); ++it)
{
  std::cout << "this is a key: " << it.key() << "\n";
  // or do anything else with the key
}

or even nicer:

for (auto it : json::iterator_wrapper(myObject["pages"]))
{
  std::cout << "this is a key: " << it.key() << "\n";
  // or do anything else with the key
}