How to create a nested JsonCpp's Json::Value object

I needed to create a nested JsonCpp's Json::Value object.

This task is very easy using Json::Value's implicit constructors.

In the following example I created on the fly the configuration for a Minimizer object I wanted to include in a simulation:

#include <iostream>
#include "jsoncpp/json.h"

using namespace std;

int main(int argc, char **argv)
{
 // Creation
 Json::Value minimizer;
 Json::Value minParameters;
 minParameters["MinimumRMS"] = 0.2;
 minParameters["sgbUpdated"] = true;
 minimizer["Minimizer"]["parameters"] = minParameters;
 minimizer["algorithm"] = "TruncatedNewton";
 
 // Output to see the result
 cout<<"creating nested Json::Value Example pretty print: "
     <<endl<<minimizer.toStyledString()
     <<endl;
 
 return 0;
}

Compile it doing:

 
$ g++ -o test_create_json test_create_json.cpp -ljson_linux-gcc-4.4.5_libmt

And you'll get:

 
$ ./test_create_json 
creating nested Json::Value Example pretty print: 
{
   "Minimizer" : {
      "parameters" : {
         "MinimumRMS" : 0.20,
         "sgbUpdated" : true
      }
   },
   "algorithm" : "TruncatedNewton"
}