Return of unfound value?

[ghost]

Perhaps this is in the exception handling documentation somewhere, but I wasn't able to find a specific answer to this - what happens if a value isn't found? Is there a default that would be returned? For example, I have several functions that I want to call after reading an object out of JSON, but not all of the functions have values that I need to set, they can be zeros or nulls. So if the DOM returns a zero for element["thing"].get() if the element doesn't exist in the JSON, that's fine. Can you elaborate what might happen in this scenario?

[nlohmann]

There are multiple ways, see https://json.nlohmann.me/features/element_access/.

[ghost]

Thank you, the note about a null value being inserted on empty elements answers it, I think! :)

[gregmarr]

@aaronstackpole Just note the difference in behavior between const and non-const versions.