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class NODUP_LIST [T -> COMPARABLE] inherit ORDERED_LIST [T] rename insert as ordered_insert end in Microsoft Office Drawer barcode 39 in Microsoft Office class NODUP_LIST [T -> COMPARABLE] inherit ORDERED_LIST [T] rename insert as ordered_insert end




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class NODUP_LIST [T -> COMPARABLE] inherit ORDERED_LIST [T] rename insert as ordered_insert end using microsoft toassign 39 barcode with asp.net web,windows application Intelligent Mail R. S. Rist, 1993.

creation make feature {ANY} invariant no_duplicates: no_duplicates end -- class NODUP_LIST NODUP_LIST de bar code 39 for None fines a Boolean function no_duplicates which returns true only if each element in the list is unique. No_duplicates has a precondition of true, and its postcondition requires that if the function returns false then the last two elements examined are identical. The body of the routine consists of a single loop.

The function value is initialized to true, and each pair of elements in the list is examined in turn. If the pair is equal then Result is set to false, otherwise nothing is done..

no_duplicates : BOOLEAN is local k: INTEGER do from Result := true k := 1 until k >= count or not Result loop if elements.item (k).is_equal (elements.

item (k - 1)) then Result := false end k := k + 1 end ensure correct_result: not Result implies elements.item (k - 1).is_equal (elements.

item (k - 2)) end -- no_duplicates. To illustrate barcode 3/9 for None the use of rescue clauses, consider a routine that attempts to insert an element into a NODUP_LIST. The procedure try_insert takes the element to be inserted as an argument. Its precondition requires that space be available in the list, while its postcondition ensures that the element has been inserted, but is not a duplicate.

The body of the routine simply calls the insert routine from ORDERED_LIST. Specifically, the new element is inserted at position location plus one by ordered_insert. If an element with the same value was already present, then it will be at position location.

The postcondition ensures that this possibility has not occurred, and the rescue clause for the procedure removes the duplicate element if necessary. For our present purpose, we will assume that ordered_insert either inserts the element in question, or fails leaving the original list unchanged. Therefore, the postcondition for try_insert can be violated in two different ways.

If ordered_insert succeeds, but inserts a duplicate element, then an item must be removed from the list. On the other hand, if ordered_insert fails then the new element is not a member of the list and no further action is possible. Therefore, the body of the rescue clause for try_insert consists of an if statement which branches on the presence of a duplicate element in the list.

The code to remove the duplicate element consists of a single loop and an assignment. The loop starts at the duplicate element and. R. S. Rist, 1993.

moves each el Code39 for None ement up one location until the front of the list is reached. The assignment then reduces the number of valid elements in the list by one..

try_insert (e lem: T) is require not_full: not full local k: INTEGER do ordered_insert (elem) ensure is_member: member (elem); not_duplicate: not_duplicate rescue if location >= 0 and then elements.item (location).is_equal (elements.

item (location + 1)) then from k := location + 1 until k = count - 1 loop elements.put (elements.item (k + 1), k) k := k + 1 end count := count - 1 end end -- try_insert not_duplicate: BOOLEAN is -- have we found no duplicates in the list do Result := location = - 1 or else not elements.

item (location).is_equal (elements.item (location + 1)) end -- not_duplicate.

To better und barcode 3/9 for None erstand the operation of this routine, we will consider two cases. In both instances, assume that pre- and postconditions are being monitored at run-time, and that the precondition for try_insert evaluates to true. First, suppose we call try_insert with an element that is not a member of the current list.

The body of try_insert first calls ordered_insert, which successfully inserts the element at position location, and then the postcondition for try_insert is evaluated. Both the is_member and not_duplicate clauses evaluate to true, so the procedure terminates normally. On the other hand, suppose we call try_insert with an element that is already a member of the current list.

As before, the body of the procedure first calls ordered_insert which successfully inserts the element at position location. Then, the postcondition for try_insert is evaluated. The is_member clause evaluates to true, but the not_duplicate clause evaluates to false as the items at positions location and location plus one are identical.

Therefore, an exception is raised and the rescue clause for try_insert is executed. The condition of the if statement evaluates to true, so the code to remove a duplicate element is executed. The loop begins with the duplicate element and moves each item up one position until the front of the list is reached.

This eliminates the duplicate entry, and so when the assignment corrects count a stable state has been produced. At this point, the rescue clause terminates without having executed a retry. R. S. Rist, 1993.

instruction; Code 39 Full ASCII for None therefore, execution of the routine is complete, try_insert terminates signaling failure to its caller..
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