IFC 4.3.0.1 (IFC4X3_TC1)

8.3.2.3 IfcLogicalOperatorEnum

8.3.2.3.1 Semantic definition

IfcLogicalOperatorEnum is an enumeration that defines the logical operators that may be applied for the satisfaction of one or more operands (IfcConstraint) at a time.

The following tables illustrates application of IfcLogicalOperatorEnum in a case of three operands, A, B and C, for each operator.

Operand
A F F F T F T T T
B F F T F T F T T
C F T F F T T F T
RESULT F F F F F F F T
Table 8.3.2.3.A - LOGICALAND(A,B,C)
Operand
A F F F T F T T T
B F F T F T F T T
C F T F F T T F T
RESULT F T T T T T T T
Table 8.3.2.3.B - LOGICALOR(A,B,C)
Operand
A F F F T F T T T
B F F T F T F T T
C F T F F T T F T
RESULT F T T T F F F F
Table 8.3.2.3.C - LOGICALXOR(A,B,C)
Operand
A F F F T F T T T
B F F T F T F T T
C F T F F T T F T
RESULT T T T T T T T F
Table 8.3.2.3.D - LOGICALNOTAND(A,B,C)
Operand
A F F F T F T T T
B F F T F T F T T
C F T F F T T F T
RESULT T F F F F F F F
Table 8.3.2.3.E - LOGICALNOTOR(A,B,C)

8.3.2.3.2 Type values

Type Description
LOGICALAND

Defines a relationship between operands whereby the result is true if all operands are true, and false if at least one operand is false.

LOGICALNOTAND

Defines a relationship between operands whereby the result is true if at least one operand is false, and false if all operands are true.

LOGICALNOTOR

Defines a relationship between operands whereby the result is true if all operands are false, and false if at least one operand is true.

LOGICALOR

Defines a relationship between operands whereby the result is true if at least one operand is true, and false if all operands are false.

LOGICALXOR

Defines a relationship between operands whereby the result is true if exactly one operand is true (exclusive or).

Table 8.3.2.3.F

8.3.2.3.3 Formal representation

TYPE IfcLogicalOperatorEnum = ENUMERATION OF
	(LOGICALAND
	,LOGICALNOTAND
	,LOGICALNOTOR
	,LOGICALOR
	,LOGICALXOR);
END_TYPE;

8.3.2.3.4 References

8.3.2.3.5 Changelog

8.3.2.3.5.1 IFC4

  • item, LOGICALNOTAND
  • item, LOGICALNOTOR
  • item, LOGICALXOR