Insertion and Deletion of Elements in Software

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Insertion and Deletion of Elements
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An annoying aspect of the sequence mapping is that you can change the length of a sequence only at its tail To insert an element somewhere in the middle, you must open a gap by copying the elements to the right of the insertion point The following helper function preinserts an element into a sequence at a nominated position Passing an index value equal to the length of the sequence appends the element at the tail The function assumes that only legal index values in the range 0 to length()-1 will be passed:
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template<class Seq, class T> void pre_insert(Seq & seq, const T & elmt, CORBA::ULong id x) { seqlength(seqlength() + 1); for (CORBA::ULong i = seqlength() - 1; i > idx;i--) seq[i] = seq[i - 1]; seq[idx] = elmt; }
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This code extends the sequence by one element, opens a gap by copying elements from the insertion point to the tail over by one position, and then assigns the new element Similar code is required for removal of an element, in which you need to close the gap that is left behind at the deletion point:
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template<class Seq>
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void remove(Seq & seq, CORBA::ULong idx) { for (CORBA::ULong i = idx; i < seqlength() - 1; i++) seq[i] = seq[i + 1]; seqlength(seqlength() - 1); }
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Insertion and removal operations on sequences have O(n) run-time performance This performance becomes unacceptable if frequent insertions or deletions are made, particularly for long sequences with elements of complex type In such a case, you are better off using a more suitable data structure instead of trying to manipulate sequence elements in place For example, you can use an STL set or multiset to perform insertions and deletions in O(log n) time After the set is in its final state, simply create an equivalent sequence by copying the contents of the set in a single pass This technique is particularly useful if you need to make many updates to a sequence but want to keep the sequence in sorted order
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The data constructor is of limited value if a sequence contains elements of user-defined complex type Consider the following IDL:
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typedef string Word; typedef sequence<Word> Line; typedef sequence<Line> Document;
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This IDL represents a line of text as a sequence of words, and a document as a sequence of lines The problem for the data constructor is that we have no idea how the C++ class for a sequence of words is represented internally For example, the sequence class will almost certainly have private data members that point at the dynamic memory for the sequence buffer It follows that we cannot write a sequence value into a binary file and read the file later to reconstruct the sequence By the time the file is read, the private pointer values of the sequence will likely point at the wrong memory locations You can use the sequence data constructor to create a sequence of complex values, but the sequence elements of the vector must be created by memberwise assignment or copy For example:
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Line * docp = Document::allocbuf(3); Line tmp; tmplength(4); tmp[0] = CORBA::string_dup("This"); tmp[1] = CORBA::string_dup("is"); tmp[2] = CORBA::string_dup("line"); tmp[3] = CORBA::string_dup("one"); // Three-line document // Temporary line // Initialize first line
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docp[0] = tmp; tmplength(1); tmp[0] = CORBA::string_dup("Line2"); docp[1] = tmp; tmp[0] = CORBA::string_dup("Line3"); docp[2] = tmp; Document my_doc(3, 3, docp, 1); //
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// Assign first line // Initialize second line // Assign second line // Initialize third line // Assign third line // Use data constructor
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This code is correct, but use of the data constructor no longer offers any advantage in performance (because the sequence elements cannot be created by reading them from a binary file or by copying memory) For this reason, you should avoid using the data constructor for anything except sequences of simple types and for sequences of string literals with the release flag set to false 6144 Rules for Using Sequences Here are some rules for safe use of sequences Do not make assumptions about when constructors or destructors run The implementation of the sequence mapping is free to delay construction or destruction of elements for efficiency reasons This means that your code must not rely on side effects from construction or destruction Simply assume that elements are copy-constructed during the first assignment, default-constructed during the first access, and destroyed when a sequence is shortened or goes out of scope In that way, you will not get any unpleasant surprises Never pass a sequence to a function for modification if the release flag is false If the sequence does not own its buffer, the called function will most likely cause memory leaks if it modifies sequence elements Avoid using the data constructor for elements of complex type For complex types, the data constructor does not offer any advantages but makes the source code more complex Remember that increasing the length of a sequence beyond the current maximum may cause relocation of elements in memory Do not index into a sequence beyond the current length Do not increase the length of a bounded sequence beyond its bound Do not use the data constructor or the buffer manipulation functions unless you really need to Direct buffer manipulation is fraught with potential memory management errors, and you should first convince yourself that any savings in performance justify the additional coding and testing effort
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