algo/remove1.cpp

The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis


#include "algostuff.hpp"
using namespace std;

int main()
{
    vector<int> coll;

    INSERT_ELEMENTS(coll,2,6);
    INSERT_ELEMENTS(coll,4,9);
    INSERT_ELEMENTS(coll,1,7);
    PRINT_ELEMENTS(coll,"coll:               ");

    // remove all elements with value 5
    vector<int>::iterator pos;
    pos = remove(coll.begin(), coll.end(),         // range
                 5);                               // value to remove

    PRINT_ELEMENTS(coll,"size not changed:   ");

    // erase the "removed" elements in the container
    coll.erase(pos, coll.end());
    PRINT_ELEMENTS(coll,"size changed:       ");

    // remove all elements less than 4
    coll.erase(remove_if(coll.begin(), coll.end(), // range
                         [](int elem){             // remove criterion
                             return elem<4;
                         }),
               coll.end());
    PRINT_ELEMENTS(coll,"<4 removed:         ");
}