Function cp::GroupOfPrevious(sequentialResource, scheduledActivity, firstValue, absentValue)

cp::GroupOfPrevious

The function cp::GroupOfPrevious refers to the group of the previous activity in a sequence of activities. The group of an activity is specified in the group definition attribute of the sequential resource to ensure the sequencing. For a resource \(r\), an activity \(a\), groups \(f\) and \(d\), the function cp::GroupOfPrevious(r,a,f,d) returns

  • \(d\) if \(a\) is absent,

  • \(f\) if \(a\) is present and scheduled as the first activity on \(r\), and

  • \(GroupOf(r,p)\) if \(a\) is present and not scheduled as the first activity on \(r\), and \(p\) is the previous activity of \(a\) scheduled on \(r\).

cp::GroupOfPrevious(
        sequentialResource,  ! (input) an expression
        scheduledActivity,   ! (input) an expression
        firstValue,          ! (optional) an expression
        absentValue          ! (optional) an expression
)

Arguments

sequentialResource

An expression that results in a sequential resource.

scheduledActivity

An expression that results in an activity.

firstValue

An optional expression that results in a group. The default value of this expression is the first element of the group set of the sequential resource.

absentValue

An optional expression that results in a group. The default value of this expression is the first element of the group set of the sequential resource.

Return Value

This function returns a group.

See also