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 constexpr bool operator[](size_t pos) const; 11 12 #include <bitset> 13 #include <type_traits> 14 #include <cstdlib> 15 #include <cassert> 16 17 #if defined(__clang__) 18 #pragma clang diagnostic ignored "-Wtautological-compare" 19 #endif 20 21 template <std::size_t N> 22 std::bitset<N> make_bitset()23make_bitset() 24 { 25 std::bitset<N> v; 26 for (std::size_t i = 0; i < N; ++i) 27 v[i] = static_cast<bool>(std::rand() & 1); 28 return v; 29 } 30 31 template <std::size_t N> test_index_const()32void test_index_const() 33 { 34 const std::bitset<N> v1 = make_bitset<N>(); 35 const bool greater_than_0 = std::integral_constant<bool, (N > 0)>::value; // avoid compiler warnings 36 if (greater_than_0) 37 { 38 assert(v1[N/2] == v1.test(N/2)); 39 } 40 } 41 main()42int main() 43 { 44 test_index_const<0>(); 45 test_index_const<1>(); 46 test_index_const<31>(); 47 test_index_const<32>(); 48 test_index_const<33>(); 49 test_index_const<63>(); 50 test_index_const<64>(); 51 test_index_const<65>(); 52 test_index_const<1000>(); 53 } 54