How to set different decimal places in same rapidjson document - formatting

Question

I have made a rapidjson document with all my objects and values using usual AddMember() method. Now I want to get the string out of that document for publishing to a mqtt broker. But inside that string, some members shall have 2 decimal places, some only one, and others all decimals.
I don't find how to set decimal place for a specific member after the document was fully builded.
I succeeded to do so by building my json document with a writer but this is not what i want to do because this document can't be easily modified:
#include <string>
#include <iostream>
#include <sstream>
#include <rapidjson/document.h> // rapidjson's DOM-style API
#include <rapidjson/prettywriter.h> // for stringify JSON
#include <rapidjson/stringbuffer.h>
using namespace rapidjson;
using namespace std;
int main (int argc, char* argv[])
{
Document doc;
StringBuffer buffer;
Writer<StringBuffer> writer(buffer);
writer.StartObject();
writer.Key("member1");
writer.SetMaxDecimalPlaces(2);
writer.Double(1.0000001);
writer.Key("member2");
writer.SetMaxDecimalPlaces(3);
writer.Double(3.123456);
writer.Key("member3");
writer.SetMaxDecimalPlaces(8);
writer.Double(2.123456);
writer.EndObject();
cout << buffer.GetString() << endl;
return 0;
}
./decimal
{"member1":1.0,"member2":3.123,"member3":2.123456}
Now, this how i build my document:
#include <string>
#include <iostream>
#include <sstream>
#include <rapidjson/document.h> // rapidjson's DOM-style API
#include <rapidjson/prettywriter.h> // for stringify JSON
#include <rapidjson/stringbuffer.h>
using namespace rapidjson;
using namespace std;
int main (int argc, char* argv[])
{
Document doc;
Document::AllocatorType& allocator = doc.GetAllocator();
StringBuffer buffer;
Writer<StringBuffer> writer(buffer);
doc.SetObject();
doc.AddMember("member1", 1.0000001, allocator);
doc.AddMember("member3", 3.123456, allocator);
doc.AddMember("member2", 2.123456, allocator);
writer.SetMaxDecimalPlaces(2);
doc.Accept(writer);
cout << buffer.GetString() << endl;
return 0;
}
./decimal
{"member1":1.0,"member2":2.12,"member3":3.12}
The SetMaxDecimalPlaces() applies to the whole document this way
I would like to get same output has first code example but using document made from second source code. How can i tell the writer to format each member differently ?

Answer 1

I'm super late to the party, but you can create a second writer with different writing settings:
StringBuffer buffer;
Writer<StringBuffer> writer1(buffer); // original writer
Writer<StringBuffer> writer2(buffer); // a new second writer
writer1.SetMaxDecimalPlaces(1);
writer2.SetMaxDecimalPlaces(2);
and then use the specific writers to write directly into the buffer instead of using the doc to call the writer:
writer.Key("member1");
writer.Double(1.0);
writer2.Key("member2");
writer2.Double(2.12);
writer2.Key("member3");
writer2.Double(3.12);
Full example:
using namespace rapidjson;
using namespace std;
int main (int argc, char* argv[])
{
StringBuffer buffer;
Writer<StringBuffer> writer1(buffer);
Writer<StringBuffer> writer2(buffer);
writer1.SetMaxDecimalPlaces(2);
writer2.SetMaxDecimalPlaces(2);
writer1.StartObject();
writer1.Key("member1");
writer1.Double(1.0);
writer2.Key("member2");
writer2.Double(2.12);
writer2.Key("member3");
writer2.Double(3.12);
writer1.EndObject();
cout << buffer.GetString() << endl;
return 0;
}