Initializing help system before first use

setelt

Purpose
Sets the value of an element of an array of reversibles. If this procedure is used during the CP search, the reversible will be restored to its previous value on backtracking beyond the state where this value has been set.
Synopsis
procedure setelt(ra:cpreversiblearray, ind: integer, value:integer)
Arguments
ra 
an array of reversibles,
ind 
the index of an array element,
value 
new value for the reversible.
Example
The following example saves the state of the constraint system, changes the value of an element the reversible array reva, then restores the previous state of the constraint system and displays the restored value of the reversible number. 
set_reversible_attributes(reva, 1, 10, 0)

! Save current state of constraint system
cp_save_state

setelt(reva, 4, -10)
writeln("The 4'th element of 'reva' is ", setelt(reva, 4))

! Revert to the saved system state
cp_restore_state
writeln("After state restoration reversible array is: ", reva)
Related topics
set_reversible_attributes getelt getsize

Parent Topic Problem

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