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unique (3)
  • >> unique (3) ( Solaris man: Библиотечные вызовы )
  • 
                           Standard C++ Library
                 Copyright 1998, Rogue Wave Software, Inc.
    
    
    NAME
         unique, unique_copy
    
          - Removes consecutive duplicates from a range of values and
         places the resulting unique values into the result.
    
    
    
    SYNOPSIS
         #include <algorithm>
         template <class ForwardIterator>
          ForwardIterator
             unique (ForwardIterator first, ForwardIterator last);
         template <class ForwardIterator, class BinaryPredicate>
          ForwardIterator
             unique (ForwardIterator first, ForwardIterator last,
                    BinaryPredicate binary_pred);
         template <class InputIterator, class OutputIterator>
          OutputIterator
             unique_copy (InputIterator first, InputIterator last,
                         OutputIterator result);
         template <class InputIterator, class OutputIterator,
                  class BinaryPredicate>
          OutputIterator
             unique_copy (InputIterator first, InputIterator last,
                         OutputIterator result,
                         BinaryPredicate binary_pred);
    
    
    
    DESCRIPTION
         The unique algorithm moves through a sequence and eliminates
         all  but  the  first element from every consecutive group of
         equal elements. There are two versions of the  algorithm-one
         that  tests  for  equality  and a second that tests adjacent
         elements against a binary predicate. An element is unique if
         it does not meet the corresponding condition listed here:
    
         *i  ==  *(i  -  1)
    
         or
    
         binary_pred(*i, *(i - 1)) == true.
    
         If an element is unique, it is copied to the  front  of  the
         sequence, overwriting the existing elements. Once all unique
         elements have been identified. The remainder of the sequence
         is left unchanged, and unique returns the end of the result-
         ing range.
    
         The unique_copy algorithm  copies  the  first  element  from
         every consecutive group of equal elements to an OutputItera-
         tor. The unique_copy algorithm  also  has  two  versions-one
         that  tests  for  equality  and a second that tests adjacent
         elements against a binary predicate.
    
         unique_copy returns the end of the resulting range.
    
    
    
    COMPLEXITY
         For unique_copy, it is exactly (last - first) -  1  applica-
         tions of the corresponding predicate are performed.
    
    
    
    EXAMPLE
         //
         // unique.cpp
         //
         #include <algorithm>
         #include <vector>
         #include <iostream>
         using namespace std;
         int main()
          {
         //Initialize two vectors
         int a1[20] = {4, 5, 5, 9, -1, -1, -1, 3, 7, 5,
                      5, 5, 6, 7, 7, 7, 4, 2, 1, 1};
         vector<int> v(a1+0, a1+20), result;
    
         //Create an insert_iterator for results
         insert_iterator<vector<int> > ins(result, result.begin());
    
         //Demonstrate includes
         cout << "The vector: " << endl << "    ";
         copy(v.begin(),v.end(),
             ostream_iterator<int,char>(cout," "));
    
         //Find the unique elements
         unique_copy(v.begin(), v.end(), ins);
    
         //Display the results
         cout << endl << endl
              << "Has the following unique elements:"
              << endl << "     ";
    
         copy(result.begin(),result.end(),
             ostream_iterator<int,char>(cout," "));
         return 0;
         }
    
         Program Output
    
    
    
         The vector:
         4 5 5 9 -1 -1 -1 3 7 5 5 5 6 7 7 7 4 2 1 1
         Has the following unique elements:
         4 5 9 -1 3 7 5 6 7 4 2 1
    
    
    
    WARNINGS
         If your compiler does not support default  template  parame-
         ters,  then you always need to supply the Allocator template
         argument. For instance, you need to write:
    
         vector<int, allocator<int> >
    
         instead of:
    
         vector<int>
    
         If your compiler does not support namespaces,  then  you  do
         not need the using declaration for std.
    
    
    
    


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