pfi/pficommon — Issue #24: size() for json_object
Author: repeatedly
Created: 2012-02-21 01:32:40+00:00
State: open

JavaScript object doesn't have length property.
But other languages support size/length (or keys property) for AssociativeArray.

So, I want size support for json_object.
Currently, I use ```distance(json.begin(), json.end())``` to calculate the size of json_object.