Container includes: generic includes algorithm : includes « STL Algorithms Merge « C++ Tutorial

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2. STL Algorithms Merge
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#include <iostream>
#include <cassert>
#include <algorithm>
#include <vector>
using namespace std;

int main()
{
  bool result;

  string s("abcde");
  string s2("aeiou");

  vector<char> vector1(s.begin(), s.end());
  vector<char> vector2(s2.begin(), s2.end());

  // Illustrate includes:
  result = includes(vector1.begin(), vector1.end(),vector2.begin(), vector2.end());
  assert (result == false);

  result = includes(vector1.begin(), vector1.end(),vector2.begin(), vector2.begin() + 2);
  // 'a' and 'e' are contained in vector1
  assert (result == true);

  return 0;
}