How to insert data into nested map in c++?

Question

//I am reading data from file and storing data into structure.Here "obj" is a object of structure.

Also note that my file have outer map key multiple times means when i am reading from file then some field of structure has common value and i am using that common value as a key of outer loop.

If I have only single value of outer key then it works fine but when more than one value of key then it fails.

typedef std::map<double,Order_Msg,std::greater<double> >InnerMap; typedef std::map<int, InnerMap> OuterMap; InnerMap buy_detailsmap; OuterMap buy_tokenmap; //one way buy_tokenmap.insert(make_pair(obj.token,InnerMap())); buy_detailsmap.insert(make_pair(obj.orderId,obj)); //another way buy_detailsmap.insert (std::pair<double,Order_Msg>(obj.orderId,obj)); buy_tokenmap.insert(std::make_pair(obj.token,buy_detailsmap));

I tried both but its not working properly.

Define "its not working properly"

Lightness Races in Orbit
– Lightness Races in Orbit

2015-06-11 10:19:26 +00:00
Commented Jun 11, 2015 at 10:19 — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Jun 11, 2015 at 10:19

juanchopanza · Accepted Answer · 2015-06-11 10:55:06Z

2

It isn't clear why you need buy_detailsmap, as it is de-coupled from buy_detailsmap. Unless you really need insert's semantics, you could simply use operator[]:

buy_tokenmap[obj.token][obj.orderId] = obj;

edited Jun 11, 2015 at 10:55

answered Jun 11, 2015 at 10:12

juanchopanza

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1 Comment

Lightness Races in Orbit Over a year ago

True. Didn't answer the question, though!

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