text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // <iterator>
  
  // insert_iterator
  
  // requires CopyConstructible<Cont::value_type>
  //   insert_iterator<Cont>&
  //   operator=(const Cont::value_type& value);
  
  #include <iterator.hxx>
  #include <vector.hxx>
  #include <cassert.hxx>
  #include "nasty_containers.h"
  
  #include "test_macros.h"
  
  template <class C>
  void
  test(C c1, typename C::difference_type j,
       typename C::value_type x1, typename C::value_type x2,
       typename C::value_type x3, const C& c2)
  {
      std::insert_iterator<C> q(c1, c1.begin() + j);
      q = x1;
      q = x2;
      q = x3;
      assert(c1 == c2);
  }
  
  template <class C>
  void
  insert3at(C& c, typename C::iterator i,
       typename C::value_type x1, typename C::value_type x2,
       typename C::value_type x3)
  {
      i = c.insert(i, x1);
      i = c.insert(++i, x2);
      c.insert(++i, x3);
  }
  
  int main(int, char**)
  {
      {
      typedef std::vector<int> C;
      C c1;
      for (int i = 0; i < 3; ++i)
          c1.push_back(i);
      C c2 = c1;
      insert3at(c2, c2.begin(), 'a', 'b', 'c');
      test(c1, 0, 'a', 'b', 'c', c2);
      c2 = c1;
      insert3at(c2, c2.begin()+1, 'a', 'b', 'c');
      test(c1, 1, 'a', 'b', 'c', c2);
      c2 = c1;
      insert3at(c2, c2.begin()+2, 'a', 'b', 'c');
      test(c1, 2, 'a', 'b', 'c', c2);
      c2 = c1;
      insert3at(c2, c2.begin()+3, 'a', 'b', 'c');
      test(c1, 3, 'a', 'b', 'c', c2);
      }
      {
      typedef nasty_vector<int> C;
      C c1;
      for (int i = 0; i < 3; ++i)
          c1.push_back(i);
      C c2 = c1;
      insert3at(c2, c2.begin(), 'a', 'b', 'c');
      test(c1, 0, 'a', 'b', 'c', c2);
      c2 = c1;
      insert3at(c2, c2.begin()+1, 'a', 'b', 'c');
      test(c1, 1, 'a', 'b', 'c', c2);
      c2 = c1;
      insert3at(c2, c2.begin()+2, 'a', 'b', 'c');
      test(c1, 2, 'a', 'b', 'c', c2);
      c2 = c1;
      insert3at(c2, c2.begin()+3, 'a', 'b', 'c');
      test(c1, 3, 'a', 'b', 'c', c2);
      }
  
    return 0;
  }
  