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 */