Remove all elements with values less than 50

 
 
/* 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 <set>
#include <deque>
#include <algorithm>

using namespace std;

/* 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;
}


int main()
{
    set<int,greater<int> > coll1;
    deque<int> coll2;

    // insert elements from 1 to 9
    for (int i=1; i<=9; ++i) {
        coll1.insert(i);
    }

    PRINT_ELEMENTS(coll1,"initialized: ");

    // transform all elements into coll2 by multiplying 10
    transform (coll1.begin(),coll1.end(),        // source
               back_inserter(coll2),             // destination
               bind2nd(multiplies<int>(),10));   // operation

    PRINT_ELEMENTS(coll2,"transformed: ");

    // Remove all elements with values less than 50
    coll2.erase(remove_if(coll2.begin(),coll2.end(), // range
                          bind2nd(less<int>(),50)),  // remove criterion
                coll2.end());

    PRINT_ELEMENTS(coll2,"removed:     ");
}

/* 
initialized: 9 8 7 6 5 4 3 2 1
transformed: 90 80 70 60 50 40 30 20 10
removed:     90 80 70 60 50

 */
Remove all elements with values less than 50 : deque erase « Deque « C++

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