how to convert complex json to somthing i can work with in c++

I'm using qt, and I parse a comp开发者_Python百科lex JSON data structure but I find my self doing to many loops each time I need to parse this JSON. What is the best way to parse complex large and complex JSON structures?

I use http://qjson.sourceforge.net/ to map JSON data to QVarianMap's. However I don't know how it will work for large data sets.