C++ Tutorial/STL Algorithms Non modifying sequence operations/search n

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search the vector for the occurrence of a certain pattern with search_n

#include <algorithm>
#include <vector>
#include <list>
#include <iostream>
using namespace std;
int main ()
{
    vector <int> v;
    for (int nNum = -9; nNum < 10; ++ nNum)
        v.push_back (nNum);
    v.push_back (9);
    v.push_back (9);
    list <int> l;
    for (int nNum = -4; nNum < 5; ++ nNum)
        l.push_back (nNum);
    // search the vector for the occurrence of pattern {9, 9, 9}
    vector <int>::iterator vl;
    vl = search_n ( v.begin () // Start range
                  , v.end ()   // End range
                  , 3          // Count of item to be searched for
                  , 9 );       // Item to search for
    if (vl != v.end ()){
        cout << "The sequence {9, 9, 9} found a match in the vector at ";
        cout << "offset-position: ";
        cout << distance (v.begin (), vl);
        cout << endl;
    }
    return 0;
}

Use search_n to find four consecutive elements with value 3

/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#include <iostream>
#include <vector>
#include <deque>
#include <list>
#include <set>
#include <map>
#include <string>
#include <algorithm>
#include <iterator>
#include <functional>
#include <numeric>
/* PRINT_ELEMENTS()
 * - prints optional C-string optcstr followed by
 * - all elements of the collection coll
 * - separated by spaces
 */
template <class T>
inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")
{
    typename T::const_iterator pos;
    std::cout << optcstr;
    for (pos=coll.begin(); pos!=coll.end(); ++pos) {
        std::cout << *pos << " ";
    }
    std::cout << std::endl;
}
/* INSERT_ELEMENTS (collection, first, last)
 * - fill values from first to last into the collection
 * - NOTE: NO half-open range
 */
template <class T>
inline void INSERT_ELEMENTS (T& coll, int first, int last)
{
    for (int i=first; i<=last; ++i) {
        coll.insert(coll.end(),i);
    }
}
using namespace std;
int main()
{
   deque<int> coll;
   INSERT_ELEMENTS(coll,1,9);
   PRINT_ELEMENTS(coll);
   // find four consecutive elements with value 3
   deque<int>::iterator pos;
   pos = search_n (coll.begin(), coll.end(),    // range
                   4,                           // count
                   3);                          // value
   // print result
   if (pos != coll.end()) {
       cout << "four consecutive elements with value 3 "
            << "start with " << distance(coll.begin(),pos) +1
            << ". element" << endl;
   }
   else {
       cout << "no four consecutive elements with value 3 found"
            << endl;
   }
}
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no four consecutive elements with value 3 found

Use search_n with custom function to find four consecutive elements with value greater than 3

/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#include <iostream>
#include <vector>
#include <deque>
#include <list>
#include <set>
#include <map>
#include <string>
#include <algorithm>
#include <iterator>
#include <functional>
#include <numeric>
/* PRINT_ELEMENTS()
 * - prints optional C-string optcstr followed by
 * - all elements of the collection coll
 * - separated by spaces
 */
template <class T>
inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")
{
    typename T::const_iterator pos;
    std::cout << optcstr;
    for (pos=coll.begin(); pos!=coll.end(); ++pos) {
        std::cout << *pos << " ";
    }
    std::cout << std::endl;
}
/* INSERT_ELEMENTS (collection, first, last)
 * - fill values from first to last into the collection
 * - NOTE: NO half-open range
 */
template <class T>
inline void INSERT_ELEMENTS (T& coll, int first, int last)
{
    for (int i=first; i<=last; ++i) {
        coll.insert(coll.end(),i);
    }
}
using namespace std;
int main()
{
   deque<int> coll;
   INSERT_ELEMENTS(coll,1,9);
   PRINT_ELEMENTS(coll);
   deque<int>::iterator pos;
   // find four consecutive elements with value greater than 3
   pos = search_n (coll.begin(), coll.end(),    // range
                   4,                           // count
                   3,                           // value
                   greater<int>());             // criterion
   // print result
   if (pos != coll.end()) {
            << "start with " << distance(coll.begin(),pos) +1
            << ". element" << endl;
   }
   else {
            << endl;
   }
}
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four consecutive elements with value > 3 start with 4. element