1 //===-- is_union type_traits ------------------------------------*- 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 #ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNION_H 9 #define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNION_H 10 11 #include "src/__support/CPP/type_traits/bool_constant.h" 12 #include "src/__support/macros/attributes.h" 13 #include "src/__support/macros/config.h" 14 15 namespace LIBC_NAMESPACE_DECL { 16 namespace cpp { 17 18 // is_union 19 template <class T> struct is_union : bool_constant<__is_union(T)> {}; 20 template <typename T> 21 LIBC_INLINE_VAR constexpr bool is_union_v = is_union<T>::value; 22 23 } // namespace cpp 24 } // namespace LIBC_NAMESPACE_DECL 25 26 #endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNION_H 27