NULL Values

ROSE_NULL_INT        /* null int value */
ROSE_NULL_REAL       /* null double value */
ROSE_NULL_ENUM       /* null enumeration value */
ROSE_NULL_BOOLEAN    /* null boolean/logical value */
ROSE_NULL_LOGICAL    /* null boolean/logical value */
ROSE_NULL_STRING     /* null string/binary value */

ROSE_NULL_INDEX      /* returned by find() functions */

Each of the primitive types has a null value as shown above. These values can be assigned to "unset" an attribute field. When reading or writing a Part 21 file, these values represent the "$" unset symbol. The string null is just a null pointer, and the null value for any object is also just a null pointer.

The integer and floating point nulls use in-band values (INT_MIN and DBL_MIN as with the SDAI C++ conventions), but ones that are unlikely to occur in general use. See NULL Attribute Values for examples and discussion about the use of these predefined values.

Late-bound applications may find it easier to use the isUnset() or unset() functions on RoseObject. See RoseObject::isUnset() or RoseObject::unset() for more information.

The ROSE_NULL_INDEX function is a special value that is returned by the aggregate search function to indicate no value found.

RoseBoolean and RoseLogical

typedef char RoseBoolean;
typedef char RoseLogical;

/* Values for booleans and logicals */
#define ROSE_FALSE      (0)
#define ROSE_TRUE       (1)
#define ROSE_UNKNOWN    (2)

The RoseBoolean and RoseLogical defined types represent Boolean and logical values in EXPRESS-defined data. These types can take on the ROSE_TRUE, ROSE_FALSE, or ROSE_UNKNOWN values. In addition, there are separate null values defined as ROSE_NULL_BOOLEAN and ROSE_NULL_LOGICAL

Local and global rules in the EXPRESS language return a logical value, and the convention is that any non-false value is considered to pass. In the values above, unknown is a non-zero value so simply testing for zero will get the EXPRESS behavior.

RoseDesignSectionType (enum)

enum RoseDesignSectionType {
	ROSE_SECTION_ANY = 0,	/* not a valid type, used by cursors */

The RoseDesignSectionType enumeration describes how objects in a RoseDesignSection map to the organization of a Part 21 file. The RoseDesignSection::section_type() function returns one of these values.

The ROSE_SECTION_DATA and ROSE_SECTION_HEADER values indicate the Part 21 header and data sections. The third edition of Part 21 added a reference section, which is indicated by ROSE_SECTION_REFERENCE. The ROSE_SECTION_SYSTEM value is used for a section that contains objects created and managed by the ROSE library. A system section is not written to a Part 21 file, but it is stored by a ROSE working form file.

The RoseCursor::section_type() function makes the cursor return objects from a particular type of design section. The ROSE_SECTION_ANY type indicates that all types of section should be traversed.

RoseNodeType (enum)

enum RoseNodeType {
	ROSE_INTEGER,     /* int */
	ROSE_FLOAT,       /* float */
	ROSE_BOOLEAN,     /* RoseBoolean (typedef char) */
	ROSE_LOGICAL,     /* RoseLogical (typedef char) */
	ROSE_STRING,      /* RoseSTR  (typedef char *) */
	ROSE_OID,         /* RoseOID  (typedef unsigned long) */
	ROSE_DOUBLE,      /* double */
	ROSE_BINARY,      /* RoseBinarySTR (typedef char *) */
	ROSE_ENUM,        /* For enumerated types */

	ROSE_LAST_PRIM,   /* Boundary between prims & objs */
	ROSE_STRUCT,      /* RoseStructure Object */
	ROSE_UNION,       /* RoseUnion Object */
	ROSE_AGGREGATE,   /* RoseAggregate Object */
	ROSE_DESIGN,      /* RoseDesign Object */
	ROSE_UNDEFINED    /* RoseObject - Unknown Type */

The RoseNodeType enumeration is used internally by the ROSE library to describe the fundamental form of a data value. It contains enums for many more basic types than are actually used. The RoseAttribute::slotNodeType(), RoseDomain::typeNodeType(), and RoseType::nodeType() functions return the value for a type definition or attribute.

This is a low-level interface used internally. The data dictionary RoseDomain or RoseType information provides more specific type descriptions.


<type> * ROSE_CAST (type,object)

The ROSE_CAST() macro is an extension to C++ pointer type casting that allows casting from sub to supertype and from super to subtype, even on classes with virtual base classes. It uses the ROSE C++ type information to provide run-time type checking as well. The macro works by concatenating tokens so it is important not put spaces around the type name.

See Pointer Type Casting for more discussion.

In the example below, the ROSE_CAST() macro is used to convert the result of a search to a Point reference.

Point * p;
RoseObject * obj;

obj = ROSE.findObject("some_point");  /* search for an object */
p = ROSE_CAST(Point,obj);             /* cast RoseObject* to Point* */


unsigned ROSE_COUNT (array)

The ROSE_COUNT() macro returns the number of elements in a static array of elements. This is useful when specifying a size to the RoseErrorContext constructor.


RoseDomain * ROSE_DOMAIN (type)

The ROSE_DOMAIN() macro returns the EXPRESS data dictionary information for a C++ class or primitive type understood by ROSE. Classes must be linked into an application for this macro to work. The macro works by concatenating tokens so it is important not put spaces around the type name.


RoseDomain * point_domain = ROSE_DOMAIN(Point);
RoseDomain * string_domain = ROSE_DOMAIN(STR);


void ROSE_LOAD (type)

The ROSE_LOAD() macro circumvents problems with some optimizing linkers. Most applications will not need to call this macro because they will just call stplib_init() (or IFC equivalent), which will handle everything.

If an application does not explicitly create instances of a particular class, some linkers will not bring in the class definition from a library. This macro will force the linker to bring in the specified class. The macro works by concatenating tokens so it is important not put spaces around the type name

When using the ROSE library to read STEP or IFC data from a file, the linker might think some classes are unused, particularly if your application only references a base class and calls virtual functions to do its work. See Force-Linking Classes for additional discussion.

The following will force the C++ classes Point and Line to be linked in. It is not necessary to bring in the header files for the classes.



RoseTypePtr& ROSE_TYPE (type)

The ROSE_TYPE() function returns the C++ type information for a C++ class or primitive type understood by ROSE. The classes must be linked into an application for this macro to work. The macro works by concatenating tokens so it is important not put spaces around the type name


RoseTypePtr& thePointRoseType = ROSE_TYPE(Point);
RoseTypePtr& theFloatRoseType = ROSE_TYPE(float);