c++ - How to add a sub-group to a boost property tree? -


i trying understand syntax boost property tree, it's not jumping out @ me. using boost property_tree represent simple json document. in 1 case, want construct such document, have:

property_tree::wptree json; json.put(_eventname.c_str(), l"");

and works fine, want include values underneath event like:

{ "event_name": { "time":"4pm", "day":"saturday" } }

what want is:

property_tree::wptree json; auto subtree = json.put(_eventname.c_str(), l""); for(auto val : values)   subtree.put(val->first.c_str(), val->second.c_str());

but seems throw exception. i've attempted handle on through online docs, i'm still little unsure. i'm thinking maybe solution construct new wptree sub values, , add tree json document, seems bit counterintuitive me. advice?


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