52 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// template <class T>12// constexpr T bit_ceil(T x) noexcept;13 14// Remarks: This function shall not participate in overload resolution unless15// T is an unsigned integer type16 17#include <bit>18#include <cassert>19#include <cstddef>20#include <cstdint>21#include <limits>22 23class A{};24enum E1 : unsigned char { rEd };25enum class E2 : unsigned char { red };26 27template <typename T>28constexpr bool toobig()29{30 return 0 == std::bit_ceil(std::numeric_limits<T>::max());31}32 33int main(int, char**)34{35 // Make sure we generate a compile-time error for UB36 static_assert(toobig<unsigned char>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}37 static_assert(toobig<unsigned short>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}38 static_assert(toobig<unsigned>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}39 static_assert(toobig<unsigned long>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}40 static_assert(toobig<unsigned long long>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}41 42 static_assert(toobig<std::uint8_t>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}43 static_assert(toobig<std::uint16_t>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}44 static_assert(toobig<std::uint32_t>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}45 static_assert(toobig<std::uint64_t>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}46 static_assert(toobig<std::size_t>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}47 static_assert(toobig<std::uintmax_t>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}48 static_assert(toobig<std::uintptr_t>(), ""); // expected-error {{static assertion expression is not an integral constant expression}}49 50 return 0;51}52