Erase–remove idiom

// Use g++ -std=c++11 or clang++ -std=c++11 to compile.

#include <vector> // the general-purpose vector container
#include <iostream>
#include <algorithm> // remove and remove_if
 
bool is_odd(int i)
{
  return (i % 2) != 0;  
}

void print(const std::vector<int> &vec)
{
  for (const auto& i: vec) 
    std::cout << i << ' '; 
  std::cout << std::endl;
}
 
int main()
{
  // initialises a vector that holds the numbers from 0-9.
  std::vector<int> v = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
  print(v);
 
  // removes all elements with the value 5
  v.erase( std::remove( v.begin(), v.end(), 5 ), v.end() ); 
  print(v); 
  
  // removes all odd numbers
  v.erase( std::remove_if(v.begin(), v.end(), is_odd), v.end() );
  print(v);

  return 0;  
}

/*
Output:
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 6 7 8 9 
0 2 4 6 8 
*/