IfcPathHeadToTail

BACnet MVD

#### IfcPathHeadToTail

Natural language names

| Path Head To Tail

##### Semantic definitions at the function

Function Definition

This function returns TRUE if all edges of the input path are consecutive.

> NOTE Definition according to ISO/CD 10303-42:1992
> This function returns TRUE if for the edges of the input path the end vertex of each edge is the same as the start vertex of its successor.

> NOTE Function adapted from path_head_to_tail defined in ISO10303-42.

> HISTORY New function in IFC2.0

##### Formal representations

EXPRESS Specification
`

FUNCTION IfcPathHeadToTail
(APath : IfcPath) : LOGICAL;
LOCAL
N : INTEGER := 0;
P : LOGICAL := UNKNOWN;
END_LOCAL;
N := SIZEOF (APath.EdgeList);
REPEAT i := 2 TO N;
P := P AND (APath.EdgeList[i-1].EdgeEnd :=:
APath.EdgeList[i].EdgeStart);
END_REPEAT;
RETURN (P);
END_FUNCTION;

`

References: IfcPath

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