private CharSequence generateCheckForNotWrappedState(
        final String action,
        final FieldPrecedenceModel fieldPrecedenceModel)
    {
        if (null == fieldPrecedenceModel)
        {
            return "";
        }

        final StringBuilder sb = new StringBuilder();
        sb.append("#if defined(").append(precedenceChecksFlagName).append(")\n")
            .append(TWO_INDENT)
                .append("if (codecState() == ")
                .append(qualifiedStateCase(fieldPrecedenceModel.notWrappedState()))
                .append(")\n")
            .append(TWO_INDENT).append("{\n");

        generateAccessOrderException(sb, THREE_INDENT, action);

        sb.append(TWO_INDENT).append("}\n")
            .append("#endif\n");

        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