C++ jsoncpp json エンコードする方法 - 改行なし

#include <iostream>
#include <cstdlib>
using namespace std;

#include "json/json.h"
#include "json/writer.h"

void
t ()
{
	Json::Value	r;

	Json::Value	j;

	r [ "version" ] = 1;
	r [ "message" ]	= "foo";

	j [ "data1" ]	= "abc";
	j [ "data2" ]	= "def";

	r [ "data" ]	= j;

	Json::StyledWriter	writer;

	std::string json = writer.write ( r );

	cout << json << endl;

	Json::FastWriter	writer2;

	json = writer2.write ( r );
	cout << json << endl;
}

int
main (int argc, char *argv[])
{
	t ();

	exit (EXIT_SUCCESS);
}

{
   "data" : {
      "data1" : "abc",
      "data2" : "def"
   },
   "message" : "foo",
   "version" : 1
}

{"data":{"data1":"abc","data2":"def"},"message":"foo","version":1}