private CharSequence generateMessageLengthCallPre17Helper(final List<Token> tokens)
    {
        final StringBuilder sb = new StringBuilder();
        final Integer count = (Integer)generateMessageLengthArgs(tokens, BASE_INDENT, false)[1];

        for (int i = 0; i < count; i++)
        {
            if (i > 0)
            {
                sb.append(", ");
            }

            sb.append("std::get<").append(i).append(">(e)");
        }

        return sb;
    }
\n");
        sb.append("     * The states in which a encoder/decoder/codec can live.\n");
        sb.append("     *\n");
        sb.append("     * <p>The state machine diagram below, encoded in the dot language, describes\n");
        sb.append("     * the valid state transitions according to the order in which fields may be\n");
        sb.append("     * accessed safely. Tools such as PlantUML and Graphviz can render it.\n");
        sb.append("     *\n");
        sb.append("     * <pre>{@code\n");
        fieldPrecedenceModel.generateGraph(sb, "     *   ");
        sb.append("     * }</pre>\n");
        sb.append("
sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/cpp/CppGenerator.java