C++ code generation: check composite and bitset version (aeron-io#888)

Author: greenstein

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/cpp/CppGenerator.java

@@ -2793,7 +2793,24 @@ private void writeTokenDisplay(
 
  case BEGIN_SET:
  case BEGIN_COMPOSITE:
- sb.append(indent).append("builder << ").append(fieldName).append("();\n");
+ if (0 == typeToken.version())
+ {
+ sb.append(indent).append("builder << ").append(fieldName).append("();\n");
+ }
+ else
+ {
+ new Formatter(sb).format(
+ indent + "if (%1$sInActingVersion())\n" +
+ indent + "{\n" +
+ indent + " builder << %1$s();\n" +
+ indent + "}\n" +
+ indent + "else\n" +
+ indent + "{\n" +
+ indent + " builder << %2$s;\n" +
+ indent + "}\n",
+ fieldName,
+ typeToken.signal() == Signal.BEGIN_SET ? "\"[]\"" : "\"{}\"");
+ }
  break;
  }