Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 14 | pmbaty | 1 | //===--- AlignOf.h - Portable calculation of type alignment -----*- C++ -*-===// |
| 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-exception |
||
| 6 | // |
||
| 7 | //===----------------------------------------------------------------------===// |
||
| 8 | // |
||
| 9 | // This file defines the AlignedCharArrayUnion class. |
||
| 10 | // |
||
| 11 | //===----------------------------------------------------------------------===// |
||
| 12 | |||
| 13 | #ifndef LLVM_SUPPORT_ALIGNOF_H |
||
| 14 | #define LLVM_SUPPORT_ALIGNOF_H |
||
| 15 | |||
| 16 | #include <type_traits> |
||
| 17 | |||
| 18 | namespace llvm { |
||
| 19 | |||
| 20 | /// A suitably aligned and sized character array member which can hold elements |
||
| 21 | /// of any type. |
||
| 22 | /// |
||
| 23 | /// This template is equivalent to std::aligned_union_t<1, ...>, but we cannot |
||
| 24 | /// use it due to a bug in the MSVC x86 compiler: |
||
| 25 | /// https://github.com/microsoft/STL/issues/1533 |
||
| 26 | /// Using `alignas` here works around the bug. |
||
| 27 | template <typename T, typename... Ts> struct AlignedCharArrayUnion { |
||
| 28 | using AlignedUnion = std::aligned_union_t<1, T, Ts...>; |
||
| 29 | alignas(alignof(AlignedUnion)) char buffer[sizeof(AlignedUnion)]; |
||
| 30 | }; |
||
| 31 | |||
| 32 | } // end namespace llvm |
||
| 33 | |||
| 34 | #endif // LLVM_SUPPORT_ALIGNOF_H |