Merge pull request aeron-io#683 from agmt/to_string

[C++] Generate message pretty printers

Author: tmontgomery

sbe-samples/src/main/cpp/GeneratedStubExample.cpp

@@ -309,6 +309,7 @@ int main(int argc, const char* argv[])
  std::size_t encodeMsgLength = encodeCar(car, buffer, hdr.encodedLength(), sizeof(buffer));
 
  cout << "Encoded Lengths are " << encodeHdrLength << " + " << encodeMsgLength << endl;
+ cout << "Encoded json: '" << car << "'" << endl;
 
  std::size_t decodeHdrLength = decodeHdr(hdr, buffer, 0, sizeof(buffer));
  std::size_t decodeMsgLength = decodeCar(car, buffer, hdr.encodedLength(), hdr.blockLength(), hdr.version(), sizeof(buffer));