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#include <algorithm>
#include <functional>
#include <iostream>
#include <iterator>
#include <vector>
  
class BadPredicate : public std::unary_function<int, bool> {
  size_t timesCalled;
public:
  BadPredicate() : timesCalled(0) {}

  bool operator()(const int &) {
    return ++timesCalled == 3;
  }
};
 
template <typename Iter>
void print_container(Iter Bb, Iter Ee) {
  std::cout << "Contains: ";
  std::copy(Bb, Ee, std::ostream_iterator<decltype(*Bb)>(std::cout, " "));
  std::cout << std::endl;
}
 
void f() {
  std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  print_container(v.begin(), v.end());

  v.erase(std::remove_if(v.begin(), v.end(), BadPredicate()), v.end());
  print_container(v.begin(), v.end());
}

#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>
  
template <typename Iter>
void print_container(Iter Bb, Iter Ee) {
  std::cout << "Contains: ";
  std::copy(Bb, Ee, std::ostream_iterator<decltype(*Bb)>(std::cout, " "));
  std::cout << std::endl;
}
 
void f() {
  std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  print_container(v.begin(), v.end());

  int timesCalled = 0;
  v.erase(std::remove_if(v.begin(), v.end(), [timesCalled](const int &) mutable { return ++timesCalled == 3; }), v.end());
  print_container(v.begin(), v.end());
}

#include <algorithm>
#include <functional>
#include <iostream>
#include <iterator>
#include <vector>
  
class BadPredicate : public std::unary_function<int, bool> {
  size_t timesCalled;
public:
  BadPredicate() : timesCalled(0) {}

  bool operator()(const int &) {
    return ++timesCalled == 3;
  }
};
 
template <typename Iter>
void print_container(Iter Bb, Iter Ee) {
  std::cout << "Contains: ";
  std::copy(Bb, Ee, std::ostream_iterator<decltype(*Bb)>(std::cout, " "));
  std::cout << std::endl;
}
 
void f() {
  std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  print_container(v.begin(), v.end());

  BadPredicate BPbp;
  v.erase(std::remove_if(v.begin(), v.end(), std::ref(BPbp)), v.end());
  print_container(v.begin(), v.end());
}