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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // test bitset<N>& flip(size_t pos);
     11 
     12 #include <bitset>
     13 #include <cstdlib>
     14 #include <cassert>
     15 
     16 #pragma clang diagnostic ignored "-Wtautological-compare"
     17 
     18 template <std::size_t N>
     19 std::bitset<N>
     20 make_bitset()
     21 {
     22     std::bitset<N> v;
     23     for (std::size_t i = 0; i < N; ++i)
     24         v[i] = static_cast<bool>(std::rand() & 1);
     25     return v;
     26 }
     27 
     28 template <std::size_t N>
     29 void test_flip_one()
     30 {
     31     std::bitset<N> v = make_bitset<N>();
     32     try
     33     {
     34         v.flip(50);
     35         bool b = v[50];
     36         if (50 >= v.size())
     37             assert(false);
     38         assert(v[50] == b);
     39         v.flip(50);
     40         assert(v[50] != b);
     41         v.flip(50);
     42         assert(v[50] == b);
     43     }
     44     catch (std::out_of_range&)
     45     {
     46     }
     47 }
     48 
     49 int main()
     50 {
     51     test_flip_one<0>();
     52     test_flip_one<1>();
     53     test_flip_one<31>();
     54     test_flip_one<32>();
     55     test_flip_one<33>();
     56     test_flip_one<63>();
     57     test_flip_one<64>();
     58     test_flip_one<65>();
     59     test_flip_one<1000>();
     60 }
     61