Use find_end with while loop to find the element : find_end « STL Algorithms Non modifying sequence operations « C++

1. C++
2. STL Algorithms Non modifying sequence operations
3. find_end

Use find_end with while loop to find the element

 
 


/* 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;
    list<int> subcoll;

    INSERT_ELEMENTS(coll,1,7);
    INSERT_ELEMENTS(coll,1,7);

    INSERT_ELEMENTS(subcoll,3,6);

    PRINT_ELEMENTS(coll,   "coll:    ");
    PRINT_ELEMENTS(subcoll,"subcoll: ");

    // search last occurrence of subcoll in coll
    deque<int>::iterator pos;
    pos = find_end (coll.begin(), coll.end(),         // range
                    subcoll.begin(), subcoll.end());  // subrange


    // loop while subcoll found as subrange of coll
    deque<int>::iterator end(coll.end());
    while (pos != end) { 
        // print position of first element
        cout << "subcoll found starting with element "
             << distance(coll.begin(),pos) + 1
             << endl;

        // search next occurrence of subcoll
        end = pos;
        pos = find_end (coll.begin(), end,               // range
                        subcoll.begin(), subcoll.end()); // subrange
        // print its position
        cout << distance(coll.begin(),pos) + 1 << endl;
    }
}
/* 
coll:    1 2 3 4 5 6 7 1 2 3 4 5 6 7
subcoll: 3 4 5 6
subcoll found starting with element 10
3
subcoll found starting with element 3
3

 */
        
  

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