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.
  //
  //===----------------------------------------------------------------------===//
  
  // <random>
  
  // template<class Engine, size_t w, class UIntType>
  // class independent_bits_engine
  
  // result_type operator()();
  
  #include <random>
  #include <cassert>
  
  template <class UIntType, UIntType Min, UIntType Max>
  class rand1
  {
  public:
      // types
      typedef UIntType result_type;
  
  private:
      result_type x_;
  
      static_assert(Min < Max, "rand1 invalid parameters");
  public:
  
  #ifdef _LIBCPP_HAS_NO_CONSTEXPR
      // Workaround for lack of constexpr in C++03
      static const result_type _Min = Min;
      static const result_type _Max = Max;
  #endif
  
      static _LIBCPP_CONSTEXPR result_type min() {return Min;}
      static _LIBCPP_CONSTEXPR result_type max() {return Max;}
  
      explicit rand1(result_type sd = Min) : x_(sd)
      {
          if (x_ > Max)
              x_ = Max;
      }
  
      result_type operator()()
      {
          result_type r = x_;
          if (x_ < Max)
              ++x_;
          else
              x_ = Min;
          return r;
      }
  };
  
  void
  test1()
  {
     typedef std::independent_bits_engine<rand1<unsigned, 0, 10>, 16, unsigned> E;
  
      E e;
      assert(e() == 6958);
  }
  
  void
  test2()
  {
      typedef std::independent_bits_engine<rand1<unsigned, 0, 100>, 16, unsigned> E;
  
      E e;
      assert(e() == 66);
  }
  
  void
  test3()
  {
      typedef std::independent_bits_engine<rand1<unsigned, 0, 0xFFFFFFFF>, 32, unsigned> E;
  
      E e(5);
      assert(e() == 5);
  }
  
  void
  test4()
  {
      typedef std::independent_bits_engine<rand1<unsigned, 0, 0xFFFFFFFF>, 7, unsigned> E;
  
      E e(129);
      assert(e() == 1);
  }
  
  void
  test5()
  {
      typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 1, unsigned> E;
  
      E e(6);
      assert(e() == 1);
  }
  
  void
  test6()
  {
      typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 11, unsigned> E;
  
      E e(6);
      assert(e() == 1365);
  }
  
  void
  test7()
  {
      typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 32, unsigned> E;
  
      E e(6);
      assert(e() == 2863311530u);
  }
  
  void
  test8()
  {
      typedef std::independent_bits_engine<std::mt19937, 64, unsigned long long> E;
  
      E e(6);
      assert(e() == 16470362623952407241ull);
  }
  
  int main()
  {
      test1();
      test2();
      test3();
      test4();
      test5();
      test6();
      test7();
      test8();
  }
  