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 // Remarks: This function shall not participate in overload resolution unless 15 // T is an unsigned integer type 16 17 #include <bit> 18 #include <cstdint> 19 #include <limits> 20 #include <cassert> 21 22 #include "test_macros.h" 23 24 class A{}; 25 enum E1 : unsigned char { rEd }; 26 enum class E2 : unsigned char { red }; 27 28 template <typename T> 29 constexpr bool toobig() 30 { 31 return 0 == std::bit_ceil(std::numeric_limits<T>::max()); 32 } 33 34 int main(int, char**) 35 { 36 // Make sure we generate a compile-time error for UB 37 static_assert(toobig<unsigned char>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 38 static_assert(toobig<unsigned short>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 39 static_assert(toobig<unsigned>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 40 static_assert(toobig<unsigned long>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 41 static_assert(toobig<unsigned long long>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 42 43 static_assert(toobig<uint8_t>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 44 static_assert(toobig<uint16_t>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 45 static_assert(toobig<uint32_t>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 46 static_assert(toobig<uint64_t>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 47 static_assert(toobig<size_t>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 48 static_assert(toobig<uintmax_t>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 49 static_assert(toobig<uintptr_t>(), ""); // expected-error {{static_assert expression is not an integral constant expression}} 50 51 return 0; 52 } 53