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 // UNSUPPORTED: c++03, c++11, c++14, c++17 10 11 // template <class T> 12 // constexpr T bit_ceil(T x) noexcept; 13 14 // Returns: The minimal value y such that has_single_bit(y) is true and y >= x; 15 // if y is not representable as a value of type T, the result is an unspecified value. 16 // Remarks: This function shall not participate in overload resolution unless 17 // T is an unsigned integer type 18 19 #include <bit> 20 #include <cstdint> 21 #include <type_traits> 22 #include <cassert> 23 24 #include "test_macros.h" 25 26 class A{}; 27 enum E1 : unsigned char { rEd }; 28 enum class E2 : unsigned char { red }; 29 30 template <typename T> 31 constexpr bool constexpr_test() 32 { 33 return std::bit_ceil(T(0)) == T(1) 34 && std::bit_ceil(T(1)) == T(1) 35 && std::bit_ceil(T(2)) == T(2) 36 && std::bit_ceil(T(3)) == T(4) 37 && std::bit_ceil(T(4)) == T(4) 38 && std::bit_ceil(T(5)) == T(8) 39 && std::bit_ceil(T(6)) == T(8) 40 && std::bit_ceil(T(7)) == T(8) 41 && std::bit_ceil(T(8)) == T(8) 42 && std::bit_ceil(T(9)) == T(16) 43 ; 44 } 45 46 47 template <typename T> 48 void runtime_test() 49 { 50 ASSERT_SAME_TYPE(T, decltype(std::bit_ceil(T(0)))); 51 LIBCPP_ASSERT_NOEXCEPT( std::bit_ceil(T(0))); 52 53 assert( std::bit_ceil(T(60)) == T( 64)); 54 assert( std::bit_ceil(T(61)) == T( 64)); 55 assert( std::bit_ceil(T(62)) == T( 64)); 56 assert( std::bit_ceil(T(63)) == T( 64)); 57 assert( std::bit_ceil(T(64)) == T( 64)); 58 assert( std::bit_ceil(T(65)) == T(128)); 59 assert( std::bit_ceil(T(66)) == T(128)); 60 assert( std::bit_ceil(T(67)) == T(128)); 61 assert( std::bit_ceil(T(68)) == T(128)); 62 assert( std::bit_ceil(T(69)) == T(128)); 63 } 64 65 int main(int, char**) 66 { 67 68 { 69 auto lambda = [](auto x) -> decltype(std::bit_ceil(x)) {}; 70 using L = decltype(lambda); 71 72 static_assert( std::is_invocable_v<L, unsigned char>, ""); 73 static_assert( std::is_invocable_v<L, unsigned int>, ""); 74 static_assert( std::is_invocable_v<L, unsigned long>, ""); 75 static_assert( std::is_invocable_v<L, unsigned long long>, ""); 76 77 static_assert( std::is_invocable_v<L, uint8_t>, ""); 78 static_assert( std::is_invocable_v<L, uint16_t>, ""); 79 static_assert( std::is_invocable_v<L, uint32_t>, ""); 80 static_assert( std::is_invocable_v<L, uint64_t>, ""); 81 static_assert( std::is_invocable_v<L, size_t>, ""); 82 83 static_assert( std::is_invocable_v<L, uintmax_t>, ""); 84 static_assert( std::is_invocable_v<L, uintptr_t>, ""); 85 86 87 static_assert(!std::is_invocable_v<L, int>, ""); 88 static_assert(!std::is_invocable_v<L, signed int>, ""); 89 static_assert(!std::is_invocable_v<L, long>, ""); 90 static_assert(!std::is_invocable_v<L, long long>, ""); 91 92 static_assert(!std::is_invocable_v<L, int8_t>, ""); 93 static_assert(!std::is_invocable_v<L, int16_t>, ""); 94 static_assert(!std::is_invocable_v<L, int32_t>, ""); 95 static_assert(!std::is_invocable_v<L, int64_t>, ""); 96 static_assert(!std::is_invocable_v<L, ptrdiff_t>, ""); 97 98 static_assert(!std::is_invocable_v<L, bool>, ""); 99 static_assert(!std::is_invocable_v<L, signed char>, ""); 100 static_assert(!std::is_invocable_v<L, char16_t>, ""); 101 static_assert(!std::is_invocable_v<L, char32_t>, ""); 102 103 #ifndef _LIBCPP_HAS_NO_INT128 104 static_assert( std::is_invocable_v<L, __uint128_t>, ""); 105 static_assert(!std::is_invocable_v<L, __int128_t>, ""); 106 #endif 107 108 static_assert(!std::is_invocable_v<L, A>, ""); 109 static_assert(!std::is_invocable_v<L, E1>, ""); 110 static_assert(!std::is_invocable_v<L, E2>, ""); 111 } 112 113 static_assert(constexpr_test<unsigned char>(), ""); 114 static_assert(constexpr_test<unsigned short>(), ""); 115 static_assert(constexpr_test<unsigned>(), ""); 116 static_assert(constexpr_test<unsigned long>(), ""); 117 static_assert(constexpr_test<unsigned long long>(), ""); 118 119 static_assert(constexpr_test<uint8_t>(), ""); 120 static_assert(constexpr_test<uint16_t>(), ""); 121 static_assert(constexpr_test<uint32_t>(), ""); 122 static_assert(constexpr_test<uint64_t>(), ""); 123 static_assert(constexpr_test<size_t>(), ""); 124 static_assert(constexpr_test<uintmax_t>(), ""); 125 static_assert(constexpr_test<uintptr_t>(), ""); 126 127 #ifndef _LIBCPP_HAS_NO_INT128 128 static_assert(constexpr_test<__uint128_t>(), ""); 129 #endif 130 131 runtime_test<unsigned char>(); 132 runtime_test<unsigned>(); 133 runtime_test<unsigned short>(); 134 runtime_test<unsigned long>(); 135 runtime_test<unsigned long long>(); 136 137 runtime_test<uint8_t>(); 138 runtime_test<uint16_t>(); 139 runtime_test<uint32_t>(); 140 runtime_test<uint64_t>(); 141 runtime_test<size_t>(); 142 runtime_test<uintmax_t>(); 143 runtime_test<uintptr_t>(); 144 145 #ifndef _LIBCPP_HAS_NO_INT128 146 runtime_test<__uint128_t>(); 147 #endif 148 149 return 0; 150 } 151