| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 10 | |
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| 11 | // template <class T> |
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| 12 | // constexpr T bit_ceil(T x) noexcept; |
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| 13 | |
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| 14 | // Remarks: This function shall not participate in overload resolution unless |
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| 15 | // T is an unsigned integer type |
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| 16 | |
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| 17 | #include <bit> |
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| 18 | #include <cassert> |
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| 19 | #include <cstddef> |
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| 20 | #include <cstdint> |
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| 21 | #include <limits> |
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| 22 | |
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| 23 | class A{}; |
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| 24 | enum E1 : unsigned char { rEd }; |
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| 25 | enum class E2 : unsigned char { red }; |
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| 26 | |
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| 27 | template <typename T> |
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| 28 | constexpr bool toobig() |
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| 29 | { |
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| 30 | return 0 == std::bit_ceil(std::numeric_limits<T>::max()); |
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| 31 | } |
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| 32 | |
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| 33 | int main(int, char**) |
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| 34 | { |
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| 35 | // Make sure we generate a compile-time error for UB |
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| 36 | static_assert(toobig<unsigned char>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 37 | static_assert(toobig<unsigned short>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 38 | static_assert(toobig<unsigned>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 39 | static_assert(toobig<unsigned long>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 40 | static_assert(toobig<unsigned long long>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 41 | |
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| 42 | static_assert(toobig<std::uint8_t>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 43 | static_assert(toobig<std::uint16_t>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 44 | static_assert(toobig<std::uint32_t>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 45 | static_assert(toobig<std::uint64_t>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 46 | static_assert(toobig<std::size_t>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 47 | static_assert(toobig<std::uintmax_t>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 48 | static_assert(toobig<std::uintptr_t>(), "" ); // expected-error {{static assertion expression is not an integral constant expression}} |
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| 49 | |
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| 50 | return 0; |
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| 51 | } |
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| 52 | |
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