[C++]: move print of JSON to after decode and check and reset decoder before printing.

Author: tmontgomery

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

@@ -312,7 +312,6 @@ int main(int argc, const char* argv[])
 
     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));
-    cout << "Encoded json: '" << car << "'" << endl;
 
     cout << "Decoded Lengths are " << decodeHdrLength << " + " << decodeMsgLength << endl;
 
@@ -328,5 +327,8 @@ int main(int argc, const char* argv[])
         return EXIT_FAILURE;
     }
 
+    car.wrapForDecode(buffer, hdr.encodedLength(), hdr.blockLength(), hdr.version(), sizeof(buffer));
+    cout << "Encoded json: '" << car << "'" << endl;
+
     return EXIT_SUCCESS;
 }