1 //===-- is_function 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_FUNCTION_H 9 #define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FUNCTION_H 10 11 #include "src/__support/CPP/type_traits/bool_constant.h" 12 #include "src/__support/CPP/type_traits/is_const.h" 13 #include "src/__support/CPP/type_traits/is_reference.h" 14 #include "src/__support/macros/attributes.h" 15 #include "src/__support/macros/config.h" 16 17 namespace LIBC_NAMESPACE_DECL { 18 namespace cpp { 19 20 // is_function 21 #if __has_builtin(__is_function) 22 template <typename T> 23 struct is_function : integral_constant<bool, __is_function(T)> {}; 24 #else 25 template <typename T> 26 struct is_function 27 : public bool_constant<!(is_reference_v<T> || is_const_v<const T>)> {}; 28 #endif 29 template <class T> 30 LIBC_INLINE_VAR constexpr bool is_function_v = is_function<T>::value; 31 32 } // namespace cpp 33 } // namespace LIBC_NAMESPACE_DECL 34 35 #endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FUNCTION_H 36