text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // <string>
  
  // template<class InputIterator>
  //   basic_string& append(InputIterator first, InputIterator last);
  
  #include <string>
  #include <cassert>
  
  #include "test_iterators.h"
  #include "min_allocator.h"
  
  template <class S, class It>
  void
  test(S s, It first, It last, S expected)
  {
      s.append(first, last);
      assert(s.__invariants());
      assert(s == expected);
  }
  
  template <class S, class It>
  void
  test_exceptions(S s, It first, It last)
  {
  	S aCopy = s;
      try {
      	s.append(first, last);
      	assert(false);
      	}
      catch (...) {}
      assert(s.__invariants());
      assert(s == aCopy);
  }
  
  int main()
  {
      {
      typedef std::string S;
      const char* s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
      test(S(), s, s, S());
      test(S(), s, s+1, S("A"));
      test(S(), s, s+10, S("ABCDEFGHIJ"));
      test(S(), s, s+52, S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("12345"), s, s, S("12345"));
      test(S("12345"), s, s+1, S("12345A"));
      test(S("12345"), s, s+10, S("12345ABCDEFGHIJ"));
      test(S("12345"), s, s+52, S("12345ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("1234567890"), s, s, S("1234567890"));
      test(S("1234567890"), s, s+1, S("1234567890A"));
      test(S("1234567890"), s, s+10, S("1234567890ABCDEFGHIJ"));
      test(S("1234567890"), s, s+52, S("1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("12345678901234567890"), s, s, S("12345678901234567890"));
      test(S("12345678901234567890"), s, s+1, S("12345678901234567890""A"));
      test(S("12345678901234567890"), s, s+10, S("12345678901234567890""ABCDEFGHIJ"));
      test(S("12345678901234567890"), s, s+52,
           S("12345678901234567890""ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S(), input_iterator<const char*>(s), input_iterator<const char*>(s), S());
      test(S(), input_iterator<const char*>(s), input_iterator<const char*>(s+1), S("A"));
      test(S(), input_iterator<const char*>(s), input_iterator<const char*>(s+10),
           S("ABCDEFGHIJ"));
      test(S(), input_iterator<const char*>(s), input_iterator<const char*>(s+52),
           S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("12345"), input_iterator<const char*>(s), input_iterator<const char*>(s),
           S("12345"));
      test(S("12345"), input_iterator<const char*>(s), input_iterator<const char*>(s+1),
           S("12345A"));
      test(S("12345"), input_iterator<const char*>(s), input_iterator<const char*>(s+10),
           S("12345ABCDEFGHIJ"));
      test(S("12345"), input_iterator<const char*>(s), input_iterator<const char*>(s+52),
           S("12345ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("1234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s),
           S("1234567890"));
      test(S("1234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+1),
           S("1234567890A"));
      test(S("1234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+10),
           S("1234567890ABCDEFGHIJ"));
      test(S("1234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+52),
           S("1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("12345678901234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s),
           S("12345678901234567890"));
      test(S("12345678901234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+1),
           S("12345678901234567890""A"));
      test(S("12345678901234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+10),
           S("12345678901234567890""ABCDEFGHIJ"));
      test(S("12345678901234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+52),
           S("12345678901234567890""ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
      }
  #if TEST_STD_VER >= 11
      {
      typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
      const char* s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
      test(S(), s, s, S());
      test(S(), s, s+1, S("A"));
      test(S(), s, s+10, S("ABCDEFGHIJ"));
      test(S(), s, s+52, S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("12345"), s, s, S("12345"));
      test(S("12345"), s, s+1, S("12345A"));
      test(S("12345"), s, s+10, S("12345ABCDEFGHIJ"));
      test(S("12345"), s, s+52, S("12345ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("1234567890"), s, s, S("1234567890"));
      test(S("1234567890"), s, s+1, S("1234567890A"));
      test(S("1234567890"), s, s+10, S("1234567890ABCDEFGHIJ"));
      test(S("1234567890"), s, s+52, S("1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("12345678901234567890"), s, s, S("12345678901234567890"));
      test(S("12345678901234567890"), s, s+1, S("12345678901234567890""A"));
      test(S("12345678901234567890"), s, s+10, S("12345678901234567890""ABCDEFGHIJ"));
      test(S("12345678901234567890"), s, s+52,
           S("12345678901234567890""ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S(), input_iterator<const char*>(s), input_iterator<const char*>(s), S());
      test(S(), input_iterator<const char*>(s), input_iterator<const char*>(s+1), S("A"));
      test(S(), input_iterator<const char*>(s), input_iterator<const char*>(s+10),
           S("ABCDEFGHIJ"));
      test(S(), input_iterator<const char*>(s), input_iterator<const char*>(s+52),
           S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("12345"), input_iterator<const char*>(s), input_iterator<const char*>(s),
           S("12345"));
      test(S("12345"), input_iterator<const char*>(s), input_iterator<const char*>(s+1),
           S("12345A"));
      test(S("12345"), input_iterator<const char*>(s), input_iterator<const char*>(s+10),
           S("12345ABCDEFGHIJ"));
      test(S("12345"), input_iterator<const char*>(s), input_iterator<const char*>(s+52),
           S("12345ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("1234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s),
           S("1234567890"));
      test(S("1234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+1),
           S("1234567890A"));
      test(S("1234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+10),
           S("1234567890ABCDEFGHIJ"));
      test(S("1234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+52),
           S("1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
  
      test(S("12345678901234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s),
           S("12345678901234567890"));
      test(S("12345678901234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+1),
           S("12345678901234567890""A"));
      test(S("12345678901234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+10),
           S("12345678901234567890""ABCDEFGHIJ"));
      test(S("12345678901234567890"), input_iterator<const char*>(s), input_iterator<const char*>(s+52),
           S("12345678901234567890""ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
      }
  #endif
  	{ // test iterator operations that throw
      typedef std::string S;
      typedef ThrowingIterator<char> TIter;
      typedef input_iterator<TIter> IIter;
      const char* s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
      test_exceptions(S(), IIter(TIter(s, s+10, 4, TIter::TAIncrement)), IIter());
      test_exceptions(S(), IIter(TIter(s, s+10, 5, TIter::TADereference)), IIter());
      test_exceptions(S(), IIter(TIter(s, s+10, 6, TIter::TAComparison)), IIter());
  
      test_exceptions(S(), TIter(s, s+10, 4, TIter::TAIncrement), TIter());
      test_exceptions(S(), TIter(s, s+10, 5, TIter::TADereference), TIter());
      test_exceptions(S(), TIter(s, s+10, 6, TIter::TAComparison), TIter());
  	}
  }
  