Removing values from a sequence with algorithms remove_if - C++ STL Algorithm

C++ examples for STL Algorithm:remove_if

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Description

Removing values from a sequence with algorithms remove_if

Demo Code

#include <iostream> 
#include <algorithm> // algorithm definitions 
#include <vector> // vector class-template definition 
#include <iterator> // ostream_iterator 
using namespace std;

bool greater9(int); // prototype 

int main()//from  w  w  w. java2 s .  com
{
  const int SIZE = 10;
  int a[SIZE] = { 10, 2, 10, 4, 16, 6, 14, 8, 12, 10 };
  ostream_iterator< int > output(cout, " ");
  vector< int > v(a, a + SIZE); // copy of a 
  vector< int >::iterator newLastElement;

  cout << "Vector v before removing all 10s:\n           ";
  copy(v.begin(), v.end(), output);

  vector< int > v2(a, a + SIZE); // copy of a 
  vector< int > c(SIZE, 0); // instantiate vector c 
  cout << "\n\nVector v2 before removing all 10s and copying :\n             ";
  copy(v2.begin(), v2.end(), output);

  // remove elements greater than 9 from v3 
  newLastElement = remove_if(v2.begin(), v2.end(), greater9);
  cout << "\nVector v3 after removing all elements"
    << "\ngreater than 9:\n       ";
  copy(v2.begin(), newLastElement, output);

}

// determine whether argument is greater than 9 
bool greater9(int x)
{
  return x > 9;
}

Result


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