set_task_attributes

Purpose

Sets some attributes for a task.
A cptask is represented by three cpvar:

• start representing the start time of the task
• end representing the completion time of the task
• duration representing the duration of the task.

These three structural variables are linked with the following constraint: task + duration ≤ end. The start time variable represents two specific parameters of the task: the Earliest Start Time (EST, represented by its lower bound) and its Latest Start Time (LST, represented by its upper bound). The end variable represents another two parameters of the task: the Earliest Completion Time (ECT, represented by its lower bound) and its Latest Completion Time (LCT, represented by its upper bound). The duration variable represents the following two parameters of the task: the minimum task duration (Dmin, represented by its lower bound) and the maximum task duration (Dmax, represented by its upper bound). The graphic below illustrates these properties:

Synopsis

procedure set_task_attributes(task:cptask, duration:integer, resource:cpresource, precedences:set of cptask)

procedure set_task_attributes(task:cptask, duration:integer, resource:cpresource)

procedure set_task_attributes(task:cptask, duration:integer)

procedure set_task_attributes(task:cptask, duration:integer, precedences:set of cptask)

procedure set_task_attributes(task:cptask, resource:cpresource, requirement:integer)

Arguments

task	the task to set attributes
duration	the duration of the task
resource	a resource that is required during the execution of the task
precedences	the set of tasks that must precede t in the schedule
requirement	amount of the specified resource required per time unit

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